WordNet

dangerous to health; characterized by progressive and uncontrolled growth (especially of a tumor)
an abnormal new mass of tissue that serves no purpose (同)tumour, neoplasm

PrepTutorEJDIC

悪意のある,敵意のある / (病気が)悪性の

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/04/01 15:12:10」(JST)

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For other uses, see Cancer (disambiguation).

Cancer ⁱ/ˈkænsər/, known medically as malignant neoplasia, is a broad group of diseases involving unregulated cell growth. In cancer, cells divide and grow uncontrollably, forming malignant tumors, which may invade nearby parts of the body. The cancer may also spread to more distant parts of the body through the lymphatic system or bloodstream. Not all tumors are cancerous; benign tumors do not invade neighboring tissues and do not spread throughout the body. There are over 200 different known cancers that affect humans.^[1]

The causes of cancer are diverse, complex, and only partially understood. Many things are known to increase the risk of cancer, including tobacco use, dietary factors, certain infections, exposure to radiation, lack of physical activity, obesity, and environmental pollutants.^[2] These factors can directly damage genes or combine with existing genetic faults within cells to cause cancerous mutations.^[3] Approximately 5–10% of cancers can be traced directly to inherited genetic defects.^[4] Many cancers could be prevented by not smoking, eating more vegetables, fruits and whole grains, eating less meat and refined carbohydrates, maintaining a healthy weight, exercising, minimizing sunlight exposure, and being vaccinated against some infectious diseases.^[2]^[5]

Cancer can be detected in a number of ways, including the presence of certain signs and symptoms, screening tests, or medical imaging. Once a possible cancer is detected it is diagnosed by microscopic examination of a tissue sample. Cancer is usually treated with chemotherapy, radiation therapy and surgery. The chances of surviving the disease vary greatly by the type and location of the cancer and the extent of disease at the start of treatment. While cancer can affect people of all ages, and a few types of cancer are more common in children, the risk of developing cancer generally increases with age. In 2007, cancer caused about 13% of all human deaths worldwide (7.9 million). Rates are rising as more people live to an old age and as mass lifestyle changes occur in the developing world.^[6]

1 Definitions
2 Signs and symptoms
- 2.1 Local effects
- 2.2 Systemic symptoms
- 2.3 Metastasis
3 Causes
- 3.1 Chemicals
- 3.2 Diet and exercise
- 3.3 Infection
- 3.4 Radiation
- 3.5 Heredity
- 3.6 Physical agents
- 3.7 Hormones
- 3.8 Other
4 Pathophysiology
- 4.1 Genetic alterations
- 4.2 Epigenetic alterations
- 4.3 Metastasis
5 Diagnosis
- 5.1 Classification
- 5.2 Pathology
6 Prevention
- 6.1 Dietary
- 6.2 Medication
- 6.3 Vaccination
7 Screening
- 7.1 Recommendations
- 7.2 Genetic testing
8 Management
- 8.1 Chemotherapy
- 8.2 Radiation
- 8.3 Surgery
- 8.4 Palliative care
- 8.5 Alternative medicine
9 Prognosis
10 Epidemiology
11 History
12 Society and culture
13 Research
14 Pregnancy
15 Other animals
16 Notes
17 Further reading
18 External links

Definitions

There is no one definition that describes all cancers. They are a large family of diseases which form a subset of neoplasms, which show features suggestive of malignancy. A neoplasm or tumor is a group of cells that have undergone unregulated growth, and will often form a mass or lump, but may be distributed diffusely.^[7]^[8]

Six characteristics of malignancies have been proposed: sustaining proliferative signaling, evading growth suppressors, resisting cell death, enabling replicative immortality, inducing angiogenesis, and activating invasion and metastasis.^[9] The progression from normal cells to cells that can form a discernible mass to outright cancer involves multiple steps.^[9]^[10]

Signs and symptoms

Main article: Cancer signs and symptoms

Symptoms of cancer metastasis depend on the location of the tumor.

When cancer begins, it invariably produces no symptoms. Signs and symptoms only appear as the mass continues to grow or ulcerates. The findings that result depend on the type and location of the cancer. Few symptoms are specific, with many of them also frequently occurring in individuals who have other conditions. Cancer is the new "great imitator". Thus it is not uncommon for people diagnosed with cancer to have been treated for other diseases to which it was assumed their symptoms were due.^[11]

Local effects

Local symptoms may occur due to the mass of the tumor or its ulceration. For example, mass effects from lung cancer can cause blockage of the bronchus resulting in cough or pneumonia; esophageal cancer can cause narrowing of the esophagus, making it difficult or painful to swallow; and colorectal cancer may lead to narrowing or blockages in the bowel, resulting in changes in bowel habits. Masses in breasts or testicles may be easily felt. Ulceration can cause bleeding which, if it occurs in the lung, will lead to coughing up blood, in the bowels to anemia or rectal bleeding, in the bladder to blood in the urine, and in the uterus to vaginal bleeding. Although localized pain may occur in advanced cancer, the initial swelling is usually painless. Some cancers can cause build up of fluid within the chest or abdomen.^[11]

Systemic symptoms

General symptoms occur due to distant effects of the cancer that are not related to direct or metastatic spread. These may include: unintentional weight loss, fever, being excessively tired, and changes to the skin.^[12] Hodgkin disease, leukemias, and cancers of the liver or kidney can cause a persistent fever of unknown origin.^[11]

Some cancers may cause specific groups of systemic symptoms, termed paraneoplastic phenomena. Examples include the appearance of myasthenia gravis in thymoma and clubbing in lung cancer.^[11]

Metastasis

Main article: Metastasis

Metastasis is the spread of cancer to other locations in the body. The symptoms of metastatic cancers depend on the location of the tumor, and can include enlarged lymph nodes (which can be felt or sometimes seen under the skin and are typically hard), enlarged liver or enlarged spleen, which can be felt in the abdomen, pain or fracture of affected bones, and neurological symptoms.^[11]

Causes

Cancers are primarily an environmental disease with 90–95% of cases attributed to environmental factors and 5–10% due to genetics.^[2] Environmental, as used by cancer researchers, means any cause that is not inherited genetically, not merely pollution.^[13] Common environmental factors that contribute to cancer death include tobacco (25–30%), diet and obesity (30–35%), infections (15–20%), radiation (both ionizing and non-ionizing, up to 10%), stress, lack of physical activity, and environmental pollutants.^[2]

It is nearly impossible to prove what caused a cancer in any individual, because most cancers have multiple possible causes. For example, if a person who uses tobacco heavily develops lung cancer, then it was probably caused by the tobacco use, but since everyone has a small chance of developing lung cancer as a result of air pollution or radiation, then there is a small chance that the cancer developed because of air pollution or radiation.

Chemicals

Further information: Alcohol and cancer and Smoking and cancer

The incidence of lung cancer is highly correlated with smoking.

Particular substances have been linked to specific types of cancer. Tobacco smoking is associated with many forms of cancer,^[14] and causes 90% of lung cancer.^[15]

Many mutagens are also carcinogens, but some carcinogens are not mutagens. Alcohol is an example of a chemical carcinogen that is not a mutagen.^[16] In Western Europe 10% of cancers in males and 3% of cancers in females are attributed to alcohol.^[17]

Decades of research has demonstrated the link between tobacco use and cancer in the lung, larynx, head, neck, stomach, bladder, kidney, esophagus and pancreas.^[18] Tobacco smoke contains over fifty known carcinogens, including nitrosamines and polycyclic aromatic hydrocarbons.^[19] Tobacco is responsible for about one in three of all cancer deaths in the developed world,^[14] and about one in five worldwide.^[19] Lung cancer death rates in the United States have mirrored smoking patterns, with increases in smoking followed by dramatic increases in lung cancer death rates and, more recently, decreases in smoking rates since the 1950s followed by decreases in lung cancer death rates in men since 1990.^[20]^[21] However, the numbers of smokers worldwide is still rising, leading to what some organizations have described as the tobacco epidemic.^[22]

Cancer related to one's occupation is believed to represent between 2–20% of all cases.^[23] Every year, at least 200,000 people die worldwide from cancer related to their workplace.^[24] Most cancer deaths caused by occupational risk factors occur in the developed world.^[24] It is estimated that approximately 20,000 cancer deaths and 40,000 new cases of cancer each year in the U.S. are attributable to occupation.^[25] Millions of workers run the risk of developing cancers such as lung cancer and mesothelioma from inhaling asbestos fibers and tobacco smoke, or leukemia from exposure to benzene at their workplaces.^[24]

Diet and exercise

Diet, physical inactivity, and obesity are related to approximately 30–35% of cancer deaths.^[2]^[26] In the United States excess body weight is associated with the development of many types of cancer and is a factor in 14–20% of all cancer deaths.^[26] Physical inactivity is believed to contribute to cancer risk not only through its effect on body weight but also through negative effects on immune system and endocrine system.^[26] More than half of the effect from diet is due to overnutrition rather than from eating too little healthy foods.

Diets that are low in vegetables, fruits and whole grains, and high in processed or red meats are linked with a number of cancers.^[26] A high-salt diet is linked to gastric cancer, aflatoxin B1, a frequent food contaminate, with liver cancer, and Betel nut chewing with oral cancer.^[27] This may partly explain differences in cancer incidence in different countries. For example, gastric cancer is more common in Japan due to its high-salt diet^[28] and colon cancer is more common in the United States. Immigrants develop the risk of their new country, often within one generation, suggesting a substantial link between diet and cancer.^[29]

Infection

Main article: Infectious causes of cancer

Worldwide approximately 18% of cancer deaths are related to infectious diseases.^[2] This proportion varies in different regions of the world from a high of 25% in Africa to less than 10% in the developed world.^[2] Viruses are the usual infectious agents that cause cancer but bacteria and parasites may also have an effect.

A virus that can cause cancer is called an oncovirus. These include human papillomavirus (cervical carcinoma), Epstein–Barr virus (B-cell lymphoproliferative disease and nasopharyngeal carcinoma), Kaposi's sarcoma herpesvirus (Kaposi's sarcoma and primary effusion lymphomas), hepatitis B and hepatitis C viruses (hepatocellular carcinoma), and Human T-cell leukemia virus-1 (T-cell leukemias). Bacterial infection may also increase the risk of cancer, as seen in Helicobacter pylori-induced gastric carcinoma.^[30] Parasitic infections strongly associated with cancer include Schistosoma haematobium (squamous cell carcinoma of the bladder) and the liver flukes, Opisthorchis viverrini and Clonorchis sinensis (cholangiocarcinoma).^[31]

Radiation

Main article: Radiation-induced cancer

Up to 10% of invasive cancers are related to radiation exposure, including both ionizing radiation and non-ionizing ultraviolet radiation.^[2] Additionally, the vast majority of non-invasive cancers are non-melanoma skin cancers caused by non-ionizing ultraviolet radiation.

Sources of ionizing radiation include medical imaging, and radon gas. Radiation can cause cancer in most parts of the body, in all animals, and at any age, although radiation-induced solid tumors usually take 10–15 years, and can take up to 40 years, to become clinically manifest, and radiation-induced leukemias typically require 2–10 years to appear.^[32] Some people, such as those with nevoid basal cell carcinoma syndrome or retinoblastoma, are more susceptible than average to developing cancer from radiation exposure.^[32] Children and adolescents are twice as likely to develop radiation-induced leukemia as adults; radiation exposure before birth has ten times the effect.^[32] Ionizing radiation is not a particularly strong mutagen.^[32] Residential exposure to radon gas, for example, has similar cancer risks as passive smoking.^[32] Low-dose exposures, such as living near a nuclear power plant, are generally believed to have no or very little effect on cancer development.^[32] Radiation is a more potent source of cancer when it is combined with other cancer-causing agents, such as radon gas exposure plus smoking tobacco.^[32]

Unlike chemical or physical triggers for cancer, ionizing radiation hits molecules within cells randomly. If it happens to strike a chromosome, it can break the chromosome, result in an abnormal number of chromosomes, inactivate one or more genes in the part of the chromosome that it hit, delete parts of the DNA sequence, cause chromosome translocations, or cause other types of chromosome abnormalities.^[32] Major damage normally results in the cell dying, but smaller damage may leave a stable, partly functional cell that may be capable of proliferating and developing into cancer, especially if tumor suppressor genes were damaged by the radiation.^[32] Three independent stages appear to be involved in the creation of cancer with ionizing radiation: morphological changes to the cell, acquiring cellular immortality (losing normal, life-limiting cell regulatory processes), and adaptations that favor formation of a tumor.^[32] Even if the radiation particle does not strike the DNA directly, it triggers responses from cells that indirectly increase the likelihood of mutations.^[32]

Medical use of ionizing radiation is a growing source of radiation-induced cancers. Ionizing radiation may be used to treat other cancers, but this may, in some cases, induce a second form of cancer.^[32] It is also used in some kinds of medical imaging. It is estimated that 0.4% of cancers in 2007 in the United States are due to CTs performed in the past and that this may increase to as high as 1.5–2% with rates of CT usage during this same time period.^[33]

Prolonged exposure to ultraviolet radiation from the sun can lead to melanoma and other skin malignancies.^[34] Clear evidence establishes ultraviolet radiation, especially the non-ionizing medium wave UVB, as the cause of most non-melanoma skin cancers, which are the most common forms of cancer in the world.^[34]

Non-ionizing radio frequency radiation from mobile phones, electric power transmission, and other similar sources have been described as a possible carcinogen by the World Health Organization's International Agency for Research on Cancer.^[35] However, studies have not found a consistent link between cell phone radiation and cancer risk.^[36]

Heredity

Main article: Cancer syndrome

The vast majority of cancers are non-hereditary ("sporadic cancers"). Hereditary cancers are primarily caused by an inherited genetic defect. Less than 0.3% of the population are carriers of a genetic mutation which has a large effect on cancer risk and these cause less than 3–10% of all cancer.^[37] Some of these syndromes include: certain inherited mutations in the genes BRCA1 and BRCA2 with a more than 75% risk of breast cancer and ovarian cancer,^[37] and hereditary nonpolyposis colorectal cancer (HNPCC or Lynch syndrome) which is present in about 3% of people with colorectal cancer,^[38] among others.

Physical agents

Some substances cause cancer primarily through their physical, rather than chemical, effects on cells.^[39] A prominent example of this is prolonged exposure to asbestos, naturally occurring mineral fibers which are a major cause of mesothelioma, which is a cancer of the serous membrane, usually the serous membrane surrounding the lungs.^[39] Other substances in this category, including both naturally occurring and synthetic asbestos-like fibers such as wollastonite, attapulgite, glass wool, and rock wool, are believed to have similar effects.^[39] Non-fibrous particulate materials that cause cancer include powdered metallic cobalt and nickel, and crystalline silica (quartz, cristobalite, and tridymite).^[39] Usually, physical carcinogens must get inside the body (such as through inhaling tiny pieces) and require years of exposure to develop cancer.^[39]

Physical trauma resulting in cancer is relatively rare.^[40] Claims that breaking bones resulted in bone cancer, for example, have never been proven.^[40] Similarly, physical trauma is not accepted as a cause for cervical cancer, breast cancer, or brain cancer.^[40] One accepted source is frequent, long-term application of hot objects to the body. It is possible that repeated burns on the same part of the body, such as those produced by kanger and kairo heaters (charcoal hand warmers), may produce skin cancer, especially if carcinogenic chemicals are also present.^[40] Frequently drinking scalding hot tea may produce esophageal cancer.^[40] Generally, it is believed that the cancer arises, or a pre-existing cancer is encouraged, during the process of repairing the trauma, rather than the cancer being caused directly by the trauma.^[40] However, repeated injuries to the same tissues might promote excessive cell proliferation, which could then increase the odds of a cancerous mutation. There is no evidence that inflammation itself causes cancer,^[40] yet inflammation can contribute to proliferation, survival and migration of cancer cells by influencing the microenvironment around tumours.^[41]

Hormones

Some hormones play a role in the development of cancer by promoting cell proliferation.^[42] Insulin-like growth factors and their binding proteins play a key role in cancer cell proliferation, differentiation and apoptosis, suggesting possible involvement in carcinogenesis.^[43]

Hormones are important agents in sex-related cancers such as cancer of the breast, endometrium, prostate, ovary, and testis, and also of thyroid cancer and bone cancer.^[42] For example, the daughters of women who have breast cancer have significantly higher levels of estrogen and progesterone than the daughters of women without breast cancer. These higher hormone levels may explain why these women have higher risk of breast cancer, even in the absence of a breast-cancer gene.^[42] Similarly, men of African ancestry have significantly higher levels of testosterone than men of European ancestry, and have a correspondingly much higher level of prostate cancer.^[42] Men of Asian ancestry, with the lowest levels of testosterone-activating androstanediol glucuronide, have the lowest levels of prostate cancer.^[42]

Other factors are also relevant: obese people have higher levels of some hormones associated with cancer and a higher rate of those cancers.^[42] Women who take hormone replacement therapy have a higher risk of developing cancers associated with those hormones.^[42] On the other hand, people who exercise far more than average have lower levels of these hormones, and lower risk of cancer.^[42] Osteosarcoma may be promoted by growth hormones.^[42] Some treatments and prevention approaches leverage this cause by artificially reducing hormone levels, and thus discouraging hormone-sensitive cancers.^[42]

Other

Excepting the rare transmissions that occur with pregnancies and only a marginal few organ donors, cancer is generally not a transmissible disease. The main reason for this is tissue graft rejection caused by MHC incompatibility.^[44] In humans and other vertebrates, the immune system uses MHC antigens to differentiate between "self" and "non-self" cells because these antigens are different from person to person. When non-self antigens are encountered, the immune system reacts against the appropriate cell. Such reactions may protect against tumour cell engraftment by eliminating implanted cells. In the United States, approximately 3,500 pregnant women have a malignancy annually, and transplacental transmission of acute leukemia, lymphoma, melanoma and carcinoma from mother to fetus has been observed.^[44] The development of donor-derived tumors from organ transplants is exceedingly rare. The main cause of organ transplant associated tumors seems to be malignant melanoma, that was undetected at the time of organ harvest.^[45] Job stress does not appear to be a significant factor at least in lung, colorectal, breast and prostate cancers.^[46]

Pathophysiology

Main article: Carcinogenesis

Cancers are caused by a series of mutations. Each mutation alters the behavior of the cell somewhat.

Genetic alterations

Cancer is fundamentally a disease of tissue growth regulation failure. In order for a normal cell to transform into a cancer cell, the genes which regulate cell growth and differentiation must be altered.^[47]

The affected genes are divided into two broad categories. Oncogenes are genes which promote cell growth and reproduction. Tumor suppressor genes are genes which inhibit cell division and survival. Malignant transformation can occur through the formation of novel oncogenes, the inappropriate over-expression of normal oncogenes, or by the under-expression or disabling of tumor suppressor genes. Typically, changes in many genes are required to transform a normal cell into a cancer cell.^[48]

Genetic changes can occur at different levels and by different mechanisms. The gain or loss of an entire chromosome can occur through errors in mitosis. More common are mutations, which are changes in the nucleotide sequence of genomic DNA.

Large-scale mutations involve the deletion or gain of a portion of a chromosome. Genomic amplification occurs when a cell gains many copies (often 20 or more) of a small chromosomal locus, usually containing one or more oncogenes and adjacent genetic material. Translocation occurs when two separate chromosomal regions become abnormally fused, often at a characteristic location. A well-known example of this is the Philadelphia chromosome, or translocation of chromosomes 9 and 22, which occurs in chronic myelogenous leukemia, and results in production of the BCR-abl fusion protein, an oncogenic tyrosine kinase.

Small-scale mutations include point mutations, deletions, and insertions, which may occur in the promoter region of a gene and affect its expression, or may occur in the gene's coding sequence and alter the function or stability of its protein product. Disruption of a single gene may also result from integration of genomic material from a DNA virus or retrovirus, and resulting in the expression of viral oncogenes in the affected cell and its descendants.

Replication of the enormous amount of data contained within the DNA of living cells will probabilistically result in some errors (mutations). Complex error correction and prevention is built into the process, and safeguards the cell against cancer. If significant error occurs, the damaged cell can "self-destruct" through programmed cell death, termed apoptosis. If the error control processes fail, then the mutations will survive and be passed along to daughter cells.

Some environments make errors more likely to arise and propagate. Such environments can include the presence of disruptive substances called carcinogens, repeated physical injury, heat, ionising radiation, or hypoxia.^[49]

The errors which cause cancer are self-amplifying and compounding, for example:

A mutation in the error-correcting machinery of a cell might cause that cell and its children to accumulate errors more rapidly.
A further mutation in an oncogene might cause the cell to reproduce more rapidly and more frequently than its normal counterparts.
A further mutation may cause loss of a tumour suppressor gene, disrupting the apoptosis signalling pathway and resulting in the cell becoming immortal.
A further mutation in signaling machinery of the cell might send error-causing signals to nearby cells.

The transformation of normal cell into cancer is akin to a chain reaction caused by initial errors, which compound into more severe errors, each progressively allowing the cell to escape the controls that limit normal tissue growth. This rebellion-like scenario becomes an undesirable survival of the fittest, where the driving forces of evolution work against the body's design and enforcement of order. Once cancer has begun to develop, this ongoing process, termed clonal evolution drives progression towards more invasive stages.^[50]

Characteristic abilities developed by cancers are divided into a number of categories. Six categories were originally proposed, in a 2000 article called The Hallmarks of Cancer by Douglas Hanahan and Robert Weinberg: evasion of apoptosis, self-sufficiency in growth signals, insensitivity to anti-growth signals, sustained angiogenesis, limitless replicative potential, and metastasis. Based on further work, the same authors added two more categories in 2011: reprogramming of energy metabolism and evasion of immune destruction.^[9]^[10]

Epigenetic alterations

The central role of DNA damage and epigenetic defects in DNA repair genes in carcinogenesis

Classically, cancer has been viewed as a set of diseases that are driven by progressive genetic abnormalities that include mutations in tumour-suppressor genes and oncogenes, and chromosomal abnormalities. However, it has become apparent that cancer is also driven by epigenetic alterations.^[51]

Epigenetic alterations refer to functionally relevant modifications to the genome that do not involve a change in the nucleotide sequence. Examples of such modifications are changes in DNA methylation (hypermethylation and hypomethylation) and histone modification^[52] and changes in chromosomal architecture (caused by inappropriate expression of proteins such as HMGA2 or HMGA1).^[53] Each of these epigenetic alterations serves to regulate gene expression without altering the underlying DNA sequence. These changes may remain through cell divisions, last for multiple generations, and can be considered to be epimutations (equivalent to mutations).

Epigenetic alterations occur frequently in cancers. As an example, Schnekenburger and Diederich^[54] listed protein coding genes that were frequently altered in their methylation in association with colon cancer. These included 147 hypermethylated and 27 hypomethylated genes. Of the hypermethylated genes, 10 were hypermethylated in 100% of colon cancers, and many others were hypermethylated in more than 50% of colon cancers.

While large numbers of epigenetic alterations are found in cancers, the epigenetic alterations in DNA repair genes, causing reduced expression of DNA repair proteins, may be of particular importance. Such alterations are thought to occur early in progression to cancer and to be a likely cause of the genetic instability characteristic of cancers.^[55]^[56]^[57]^[58]

Reduced expression of DNA repair genes causes deficient DNA repair. This is shown in the figure at the 4th level from the top. (In the figure, red wording indicates the central role of DNA damage and defects in DNA repair in progression to cancer.) When DNA repair is deficient DNA damages remain in cells at a higher than usual level (5th level from the top in figure), and these excess damages cause increased frequencies of mutation and/or epimutation (6th level from top of figure). Mutation rates increase substantially in cells defective in DNA mismatch repair^[59]^[60] or in homologous recombinational repair (HRR).^[61] Chromosomal rearrangements and aneuploidy also increase in HRR defective cells.^[62]

Higher levels of DNA damage not only cause increased mutation (right side of figure), but also cause increased epimutation. During repair of DNA double strand breaks, or repair of other DNA damages, incompletely cleared sites of repair can cause epigenetic gene silencing.^[63]^[64]

Deficient expression of DNA repair proteins due to an inherited mutation can cause increased risk of cancer. Individuals with an inherited impairment in any of 34 DNA repair genes (see article DNA repair-deficiency disorder) have an increased risk of cancer, with some defects causing up to a 100% lifetime chance of cancer (e.g. p53 mutations).^[65] Germ line DNA repair mutations are noted in a box on the left side of the figure, with an arrow indicating their contribution to DNA repair deficiency. However, such germline mutations (which cause highly penetrant cancer syndromes) are the cause of only about 1 percent of cancers.^[66]

In sporadic cancers, deficiencies in DNA repair are occasionally caused by a mutation in a DNA repair gene, but are much more frequently caused by epigenetic alterations that reduce or silence expression of DNA repair genes. This is indicated in the figure at the 3rd level from the top. Many studies of heavy metal-induced carcinogenesis show that such heavy metals cause reduction in expression of DNA repair enzymes, some through epigenetic mechanisms. In some cases, DNA repair inhibition is proposed to be a predominant mechanism in heavy metal-induced carcinogenicity. In addition, there are frequent epigenetic alterations of the DNA sequences coding for small RNAs called microRNAs (or miRNAs). MiRNAs do not code for proteins, but can “target” protein-coding genes and reduce their expression.

Cancers usually arise from an assemblage of mutations and epimutations that confer a selective advantage leading to clonal expansion (see Field defects in progression to cancer). Mutations, however, may not be as frequent in cancers as epigenetic alterations. An average cancer of the breast or colon can have about 60 to 70 protein-altering mutations, of which about 3 or 4 may be “driver” mutations, and the remaining ones may be “passenger” mutations.^[67]

As pointed out above under genetic alterations, cancer is caused by failure to regulate tissue growth, when the genes which regulate cell growth and differentiation are altered. It has become clear that these alterations are caused by both DNA sequence mutation in oncogenes and tumor suppressor genes as well as by epigenetic alterations. The epigenetic deficiencies in expression of DNA repair genes, in particular, likely cause an increased frequency of mutations, some of which then occur in oncogenes and tumor suppressor genes.

Metastasis

Main article: Metastasis

Metastasis is the spread of cancer to other locations in the body. The new tumors are called metastatic tumors, while the original is called the primary tumor. Almost all cancers can metastasize.^[68] Most cancer deaths are due to cancer that has spread from its primary site to other organs (metastasized).^[69]

Metastasis is very common in the late stages of cancer, and it can occur via the blood or the lymphatic system or both. The typical steps in metastasis are local invasion, intravasation into the blood or lymph, circulation through the body, extravasation into the new tissue, proliferation, and angiogenesis. Different types of cancers tend to metastasize to particular organs, but overall the most common places for metastases to occur are the lungs, liver, brain, and the bones.^[68]

Diagnosis

Chest x-ray showing lung cancer in the left lung.

Most cancers are initially recognized either because of the appearance of signs or symptoms or through screening. Neither of these lead to a definitive diagnosis, which requires the examination of a tissue sample by a pathologist. People with suspected cancer are investigated with medical tests. These commonly include blood tests, X-rays, CT scans and endoscopy.

Most people are distressed to learn that they have cancer. They may become extremely anxious and depressed. The risk of suicide in people with cancer is approximately double the normal risk.^[70]

Classification

Further information: List of cancer types and List of oncology-related terms

Cancers are classified by the type of cell that the tumor cells resemble and is therefore presumed to be the origin of the tumor. These types include:

Carcinoma: Cancers derived from epithelial cells. This group includes many of the most common cancers, particularly in the aged, and include nearly all those developing in the breast, prostate, lung, pancreas, and colon.
Sarcoma: Cancers arising from connective tissue (i.e. bone, cartilage, fat, nerve), each of which develop from cells originating in mesenchymal cells outside the bone marrow.
Lymphoma and leukemia: These two classes of cancer arise from hematopoietic (blood-forming) cells that leave the marrow and tend to mature in the lymph nodes and blood, respectively. Leukemia is the most common type of cancer in children accounting for about 30%.^[71]
Germ cell tumor: Cancers derived from pluripotent cells, most often presenting in the testicle or the ovary (seminoma and dysgerminoma, respectively).
Blastoma: Cancers derived from immature "precursor" cells or embryonic tissue. Blastomas are more common in children than in older adults.

Cancers are usually named using -carcinoma, -sarcoma or -blastoma as a suffix, with the Latin or Greek word for the organ or tissue of origin as the root. For example, cancers of the liver parenchyma arising from malignant epithelial cells is called hepatocarcinoma, while a malignancy arising from primitive liver precursor cells is called a hepatoblastoma, and a cancer arising from fat cells is called a liposarcoma. For some common cancers, the English organ name is used. For example, the most common type of breast cancer is called ductal carcinoma of the breast. Here, the adjective ductal refers to the appearance of the cancer under the microscope, which suggests that it has originated in the milk ducts.

Benign tumors (which are not cancers) are named using -oma as a suffix with the organ name as the root. For example, a benign tumor of smooth muscle cells is called a leiomyoma (the common name of this frequently occurring benign tumor in the uterus is fibroid). Confusingly, some types of cancer use the -noma suffix, examples including melanoma and seminoma.

Some types of cancer are named for the size and shape of the cells under a microscope, such as giant cell carcinoma, spindle cell carcinoma, and small-cell carcinoma.

Pathology

The tissue diagnosis given by the pathologist indicates the type of cell that is proliferating, its histological grade, genetic abnormalities, and other features of the tumor. Together, this information is useful to evaluate the prognosis of the patient and to choose the best treatment. Cytogenetics and immunohistochemistry are other types of testing that the pathologist may perform on the tissue specimen. These tests may provide information about the molecular changes (such as mutations, fusion genes, and numerical chromosome changes) that has happened in the cancer cells, and may thus also indicate the future behavior of the cancer (prognosis) and best treatment.

An invasive ductal carcinoma of the breast (pale area at the center) surrounded by spikes of whitish scar tissue and yellow fatty tissue.
An invasive colorectal carcinoma (top center) in a colectomy specimen.
A squamous-cell carcinoma (the whitish tumor) near the bronchi in a lung specimen.
A large invasive ductal carcinoma in a mastectomy specimen.

Prevention

Cancer prevention is defined as active measures to decrease the risk of cancer.^[72] The vast majority of cancer cases are due to environmental risk factors, and many, but not all, of these environmental factors are controllable lifestyle choices. Thus, cancer is considered a largely preventable disease.^[73] Greater than 30% of cancer deaths could be prevented by avoiding risk factors including: tobacco, overweight / obesity, an insufficient diet, physical inactivity, alcohol, sexually transmitted infections, and air pollution.^[74] Not all environmental causes are controllable, such as naturally occurring background radiation, and other cases of cancer are caused through hereditary genetic disorders, and thus it is not possible to prevent all cases of cancer.

Dietary

Main article: Diet and cancer

While many dietary recommendations have been proposed to reduce the risk of cancer, the evidence to support them is not definitive.^[5]^[75] The primary dietary factors that increase risk are obesity and alcohol consumption; with a diet low in fruits and vegetables and high in red meat being implicated but not confirmed.^[76]^[77] Consumption of coffee is associated with a reduced risk of liver cancer.^[78] Studies have linked consumption of red or processed meat to an increased risk of breast cancer, colon cancer, and pancreatic cancer, a phenomenon which could be due to the presence of carcinogens in meats cooked at high temperatures.^[79]^[80] Dietary recommendations for cancer prevention typically include an emphasis on vegetables, fruit, whole grains, and fish, and an avoidance of processed and red meat (beef, pork, lamb), animal fats, and refined carbohydrates.^[5]^[75]

Medication

The concept that medications can be used to prevent cancer is attractive, and evidence supports their use in a few defined circumstances.^[81] In the general population, NSAIDs reduce the risk of colorectal cancer however due to the cardiovascular and gastrointestinal side effects they cause overall harm when used for prevention.^[82] Aspirin has been found to reduce the risk of death from cancer by about 7%.^[83] COX-2 inhibitor may decrease the rate of polyp formation in people with familial adenomatous polyposis however are associated with the same adverse effects as NSAIDs.^[84] Daily use of tamoxifen or raloxifene has been demonstrated to reduce the risk of developing breast cancer in high-risk women.^[85] The benefit verses harm for 5-alpha-reductase inhibitor such as finasteride is not clear.^[86]

Vitamins have not been found to be effective at preventing cancer,^[87] although low blood levels of vitamin D are correlated with increased cancer risk.^[88]^[89] Whether this relationship is causal and vitamin D supplementation is protective is not determined.^[90] Beta-Carotene supplementation has been found to increase lung cancer rates in those who are high risk.^[91] Folic acid supplementation has not been found effective in preventing colon cancer and may increase colon polyps.^[92]

Vaccination

Vaccines have been developed that prevent infection by some carcinogenic viruses.^[93] Human papillomavirus vaccine (Gardasil and Cervarix) decreases the risk of developing cervical cancer.^[93] The hepatitis B vaccine prevents infection with hepatitis B virus and thus decreases the risk of liver cancer.^[93] The administration of human papillomavirus and hepatitis B vaccinations is recommended when resources allow.^[94]

Screening

Main article: Cancer screening

Unlike diagnosis efforts prompted by symptoms and medical signs, cancer screening involves efforts to detect cancer after it has formed, but before any noticeable symptoms appear.^[95] This may involve physical examination, blood or urine tests, or medical imaging.^[95]

Cancer screening is currently not possible for many types of cancers, and even when tests are available, they may not be recommended for everyone. Universal screening or mass screening involves screening everyone.^[96] Selective screening identifies people who are known to be at higher risk of developing cancer, such as people with a family history of cancer.^[96] Several factors are considered to determine whether the benefits of screening outweigh the risks and the costs of screening.^[95] These factors include:

Possible harms from the screening test: for example, X-ray images involve exposure to potentially harmful ionizing radiation.
The likelihood of the test correctly identifying cancer.
The likelihood of cancer being present: Screening is not normally useful for rare cancers.
Possible harms from follow-up procedures.
Whether suitable treatment is available.
Whether early detection improves treatment outcomes.
Whether the cancer will ever need treatment.
Whether the test is acceptable to the people: If a screening test is too burdensome (for example, being extremely painful), then people will refuse to participate.^[96]
Cost of the test.

Recommendations

The U.S. Preventive Services Task Force (USPSTF) strongly recommends cervical cancer screening in women who are sexually active and have a cervix at least until the age of 65.^[97] They recommend that Americans be screened for colorectal cancer via fecal occult blood testing, sigmoidoscopy, or colonoscopy starting at age 50 until age 75.^[98] There is insufficient evidence to recommend for or against screening for skin cancer,^[99] oral cancer,^[100] lung cancer,^[101] or prostate cancer in men under 75.^[102] Routine screening is not recommended for bladder cancer,^[103] testicular cancer,^[104] ovarian cancer,^[105] pancreatic cancer,^[106] or prostate cancer.^[107]

The USPSTF recommends mammography for breast cancer screening every two years for those 50–74 years old; however, they do not recommend either breast self-examination or clinical breast examination.^[108] A 2011 Cochrane review came to slightly different conclusions with respect to breast cancer screening stating that routine mammography may do more harm than good.^[109]

Japan screens for gastric cancer using photofluorography due to the high incidence there.^[6]

Genetic testing

Management

Main article: Management of cancer

Many treatment options for cancer exist with the primary ones including surgery, chemotherapy, radiation therapy, and palliative care. Which treatments are used depends upon the type, location and grade of the cancer as well as the person's health and wishes.

Chemotherapy

Chemotherapy is the treatment of cancer with one or more cytotoxic anti-neoplastic drugs (chemotherapeutic agents) as part of a standardized regimen. The term encompasses any of a large variety of different anticancer drugs, which are divided into broad categories such as alkylating agents and antimetabolites.^[111] Traditional chemotherapeutic agents act by killing cells that divide rapidly, one of the main properties of most cancer cells.

Targeted therapy is a form of chemotherapy which target specific molecular differences between cancer and normal cells. The first targeted therapies to be developed blocked the estrogen receptor molecule, inhibiting the growth of breast cancer. Another common example is the class of Bcr-Abl inhibitors, which are used to treat chronic myelogenous leukemia (CML).^[112] Currently, there are targeted therapies for breast cancer, multiple myeloma, lymphoma, prostate cancer, melanoma and other cancers.^[113]

The efficacy of chemotherapy depends on the type of cancer and the stage. In combination with surgery, chemotherapy has proven useful in a number of different cancer types including: breast cancer, colorectal cancer, pancreatic cancer, osteogenic sarcoma, testicular cancer, ovarian cancer, and certain lung cancers.^[114] The overall effectiveness ranges from being curative for some cancers, such as some leukemias,^[115]^[116] to being ineffective, such as in some brain tumors,^[117] to being needless in others, like most non-melanoma skin cancers.^[118] The effectiveness of chemotherapy is often limited by toxicity to other tissues in the body. Even when it is impossible for chemotherapy to provide a permanent cure, chemotherapy may be useful to reduce symptoms like pain or to reduce the size of an inoperable tumor in the hope that surgery will be possible in the future.

Radiation

Radiation therapy involves the use of ionizing radiation in an attempt to either cure or improve the symptoms of cancer. It works by damaging the DNA of cancerous tissue leading to cellular death. To spare normal tissues (such as skin or organs which radiation must pass through to treat the tumor), shaped radiation beams are aimed from several angles of exposure to intersect at the tumor, providing a much larger absorbed dose there than in the surrounding, healthy tissue. As with chemotherapy, different cancers respond differently to radiation therapy.^[119]^[120]^[121]

Radiation therapy is used in about half of all cases and the radiation can be from either internal sources in the form of brachytherapy or external sources. Radiation is typically used in addition to surgery and or chemotherapy but for certain types of cancer, such as early head and neck cancer, may be used alone. For painful bone metastasis, it has been found to be effective in about 70% of people.^[122]

Surgery

Surgery is the primary method of treatment of most isolated solid cancers and may play a role in palliation and prolongation of survival. It is typically an important part of making the definitive diagnosis and staging the tumor as biopsies are usually required. In localized cancer surgery typically attempts to remove the entire mass along with, in certain cases, the lymph nodes in the area. For some types of cancer this is all that is needed to eliminate the cancer.^[114]

Palliative care

Palliative care refers to treatment which attempts to make the person feel better and may or may not be combined with an attempt to treat the cancer. Palliative care includes action to reduce the physical, emotional, spiritual, and psycho-social distress experienced by people with cancer. Unlike treatment that is aimed at directly killing cancer cells, the primary goal of palliative care is to improve the person's quality of life.

People at all stages of cancer treatment should have some kind of palliative care to provide comfort. In some cases, medical specialty professional organizations recommend that people and physicians respond to cancer only with palliative care and not with cancer-directed therapy.^[123] This includes those:^[124]

with low performance status, corresponding with limited ability to care for themself^[123]
which received no benefit from prior evidence-based treatments^[123]
who are not eligible to participate in any appropriate clinical trial^[123]
who the physician sees no strong evidence that treatment would be effective^[123]

Palliative care is often confused with hospice and therefore only involved when people approach end of life. Like hospice care, palliative care attempts to help the person cope with the immediate needs and to increase the person's comfort. Unlike hospice care, palliative care does not require people to stop treatment aimed at prolonging their lives or curing the cancer.

Multiple national medical guidelines recommend early palliative care for people whose cancer has produced distressing symptoms (pain, shortness of breath, fatigue, nausea) or who need help coping with their illness. In people who have metastatic disease when first diagnosed, oncologists should consider a palliative care consult immediately. Additionally, an oncologist should consider a palliative care consult in any person they feel has less than 12 months of life even if continuing aggressive treatment.^[125]^[126]^[127]

Alternative medicine

Complementary and alternative cancer treatments are a diverse group of health care systems, practices, and products that are not part of conventional medicine.^[128] "Complementary medicine" refers to methods and substances used along with conventional medicine, while "alternative medicine" refers to compounds used instead of conventional medicine.^[129] Most complementary and alternative medicines for cancer have not been rigorously studied or tested. Some alternative treatments have been investigated and shown to be ineffective but still continue to be marketed and promoted.^[130]

Prognosis

See also: List of cancer mortality rates and Cancer survivor

Cancer has a reputation as a deadly disease. Taken as a whole, about half of people receiving treatment for invasive cancer (excluding carcinoma in situ and non-melanoma skin cancers) die from cancer or its treatment.^[6] Survival is worse in the developing world.^[6] However, the survival rates vary dramatically by type of cancer, with the range running from basically all people surviving to almost no one surviving.

Those who survive cancer are at increased risk of developing a second primary cancer at about twice the rate of those never diagnosed with cancer.^[131] The increased risk is believed to be primarily due to the same risk factors that produced the first cancer, partly due to the treatment for the first cancer, and potentially related to better compliance with screening.^[131]

Predicting either short-term or long-term survival is difficult and depends on many factors. The most important factors are the particular kind of cancer and the patient's age and overall health. People who are frail with many other health problems have lower survival rates than otherwise healthy people. A centenarian is unlikely to survive for five years even if the treatment is successful. People who report a higher quality of life tend to survive longer.^[132] People with lower quality of life may be affected by major depressive disorder and other complications from cancer treatment and/or disease progression that both impairs their quality of life and reduces their quantity of life. Additionally, patients with worse prognoses may be depressed or report a lower quality of life directly because they correctly perceive that their condition is likely to be fatal.

Epidemiology

Main article: Epidemiology of cancer

Death rate from malignant cancer per 100,000 inhabitants in 2004.^[133]

no data

≤ 55

55–80

80–105

105–130

130–155

155–180

180–205

205–230

230–255

255–280

280–305

≥ 305

In 2008, approximately 12.7 million cancers were diagnosed (excluding non-melanoma skin cancers and other non-invasive cancers),^[6] and in 2010 nearly 7.98 million people died.^[134] Cancers as a group account for approximately 13% of all deaths each year with the most common being: lung cancer (1.4 million deaths), stomach cancer (740,000 deaths), liver cancer (700,000 deaths), colorectal cancer (610,000 deaths), and breast cancer (460,000 deaths).^[135] This makes invasive cancer the leading cause of death in the developed world and the second leading cause of death in the developing world.^[6] Over half of cases occur in the developing world.^[6]

Deaths from cancer were 5.8 million in 1990^[134] and rates have been increasing primarily due to an aging population and lifestyle changes in the developing world.^[6] The most significant risk factor for developing cancer is old age.^[136] Although it is possible for cancer to strike at any age, most people who are diagnosed with invasive cancer are over the age of 65.^[136] According to cancer researcher Robert A. Weinberg, "If we lived long enough, sooner or later we all would get cancer."^[137] Some of the association between aging and cancer is attributed to immunosenescence,^[138] errors accumulated in DNA over a lifetime,^[139] and age-related changes in the endocrine system.^[140] The effect of ageing on cancer is complicated with a number of factors such as DNA damage and inflammation promoting it and a number of factors such as vascular aging and endocrine changes inhibiting it.^[141]

Some slow-growing cancers are particularly common. Autopsy studies in Europe and Asia have shown that up to 36% of people have undiagnosed and apparently harmless thyroid cancer at the time of their deaths, and that 80% of men develop prostate cancer by age 80.^[142]^[143] As these cancers did not cause the person's death, identifying them would have represented overdiagnosis rather than useful medical care.

The three most common childhood cancers are leukemia (34%), brain tumors (23%), and lymphomas (12%).^[144] In the United States cancer affects about 1 in 285 children.^[145] Rates of childhood cancer have increased by 0.6% per year between 1975 to 2002 in the United States^[146] and by 1.1% per year between 1978 and 1997 in Europe.^[144] Death from childhood cancer have decreased by half since 1975 in the United States.^[145]

History

Main article: History of cancer

Engraving with two views of a Dutch woman who had a tumor removed from her neck in 1689.

Cancer has existed for all of human history.^[147] The earliest written record regarding cancer is from circa 1600 BC in the Egyptian Edwin Smith Papyrus and describes cancer of the breast.^[147] Hippocrates (ca. 460 BC – ca. 370 BC) described several kinds of cancer, referring to them with the Greek word καρκίνος karkinos (crab or crayfish).^[147] This name comes from the appearance of the cut surface of a solid malignant tumour, with "the veins stretched on all sides as the animal the crab has its feet, whence it derives its name".^[148] Galen stated that "cancer of the breast is so called because of the fancied resemblance to a crab given by the lateral prolongations of the tumor and the adjacent distended veins".^[149]^:738 Celsus (ca. 25 BC – 50 AD) translated karkinos into the Latin cancer, also meaning crab and recommended surgery as treatment.^[147] Galen (2nd century AD) disagreed with the use of surgery and recommended purgatives instead.^[147] These recommendations largely stood for 1000 years.^[147]

In the 15th, 16th and 17th centuries, it became acceptable for doctors to dissect bodies to discover the cause of death.^[150] The German professor Wilhelm Fabry believed that breast cancer was caused by a milk clot in a mammary duct. The Dutch professor Francois de la Boe Sylvius, a follower of Descartes, believed that all disease was the outcome of chemical processes, and that acidic lymph fluid was the cause of cancer. His contemporary Nicolaes Tulp believed that cancer was a poison that slowly spreads, and concluded that it was contagious.^[151]

The physician John Hill described tobacco snuff as the cause of nose cancer in 1761.^[150] This was followed by the report in 1775 by British surgeon Percivall Pott that cancer of the scrotum was a common disease among chimney sweeps.^[152] With the widespread use of the microscope in the 18th century, it was discovered that the 'cancer poison' spread from the primary tumor through the lymph nodes to other sites ("metastasis"). This view of the disease was first formulated by the English surgeon Campbell De Morgan between 1871 and 1874.^[153]

Society and culture

Though many diseases (such as heart failure) may have a worse prognosis than most cases of cancer, cancer is the subject of widespread fear and taboos. The euphemism "after a long illness" is still commonly used (2012), reflecting an apparent stigma.^[154] This deep belief that cancer is necessarily a difficult and usually deadly disease is reflected in the systems chosen by society to compile cancer statistics: the most common form of cancer—non-melanoma skin cancers, accounting for about one-third of all cancer cases worldwide, but very few deaths^[155]^[156]—are excluded from cancer statistics specifically because they are easily treated and almost always cured, often in a single, short, outpatient procedure.^[157]

Cancer is regarded as a disease that must be "fought" to end the "civil insurrection"; a War on Cancer has been declared. Military metaphors are particularly common in descriptions of cancer's human effects, and they emphasize both the parlous state of the affected individual's health and the need for the individual to take immediate, decisive actions himself, rather than to delay, to ignore, or to rely entirely on others caring for him. The military metaphors also help rationalize radical, destructive treatments.^[158]^[159]

In the 1970s, a relatively popular alternative cancer treatment was a specialized form of talk therapy, based on the idea that cancer was caused by a bad attitude.^[160] People with a "cancer personality"—depressed, repressed, self-loathing, and afraid to express their emotions—were believed to have manifested cancer through subconscious desire. Some psychotherapists said that treatment to change the patient's outlook on life would cure the cancer.^[160] Among other effects, this belief allows society to blame the victim for having caused the cancer (by "wanting" it) or having prevented its cure (by not becoming a sufficiently happy, fearless, and loving person).^[161] It also increases patients' anxiety, as they incorrectly believe that natural emotions of sadness, anger or fear shorten their lives.^[161] The idea was excoriated by the notoriously outspoken Susan Sontag, who published Illness as Metaphor while recovering from treatment for breast cancer in 1978.^[160] Although the original idea is now generally regarded as nonsense, the idea partly persists in a reduced form with a widespread, but incorrect, belief that deliberately cultivating a habit of positive thinking will increase survival.^[161] This notion is particularly strong in breast cancer culture.^[161]

One idea about why people with cancer are blamed or stigmatized, called the just-world hypothesis, is that blaming cancer on the patient's actions or attitudes allows the blamers to regain a sense of control. This is based upon the blamers' belief that the world is fundamentally just, and so any dangerous illness, like cancer, must be a type of punishment for bad choices, because in a just world, bad things would not happen to good people.^[162]

In 2007, the overall costs of cancer in the U.S. — including treatment and indirect mortality expenses (such as lost productivity in the workplace) — was estimated to be $226.8 billion. In 2009, 32% of Hispanics and 10% of children 17 years old or younger lacked health insurance; "uninsured patients and those from ethnic minorities are substantially more likely to be diagnosed with cancer at a later stage, when treatment can be more extensive and more costly."^[163]

Research

Main article: Cancer research

Because cancer is a class of diseases,^[164]^[165] it is unlikely that there will ever be a single "cure for cancer" any more than there will be a single treatment for all infectious diseases.^[166] Angiogenesis inhibitors were once thought to have potential as a "silver bullet" treatment applicable to many types of cancer, but this has not been the case in practice.^[167]

Experimental cancer treatments are treatments that are being studied to see whether they work. Typically, these are studied in clinical trials to compare the proposed treatment to the best existing treatment. They may be entirely new treatments, or they may be treatments that have been used successfully in one type of cancer, and are now being tested to see whether they are effective in another type.^[168] More and more, such treatments are being developed alongside companion diagnostic tests to target the right drugs to the right patients, based on their individual biology.^[169]

Cancer research is the intense scientific effort to understand disease processes and discover possible therapies.

Research about cancer causes focuses on the following issues:

Agents (e.g. viruses) and events (e.g. mutations) which cause or facilitate genetic changes in cells destined to become cancer.
The precise nature of the genetic damage, and the genes which are affected by it.
The consequences of those genetic changes on the biology of the cell, both in generating the defining properties of a cancer cell, and in facilitating additional genetic events which lead to further progression of the cancer.

The improved understanding of molecular biology and cellular biology due to cancer research has led to a number of new treatments for cancer since U.S. President Nixon declared the "War on Cancer" in 1971. Since then, the U.S. has spent over $200 billion on cancer research, including resources from the public and private sectors and foundations.^[170] During that time, the country has seen a five percent decrease in the cancer death rate (adjusting for size and age of the population) between 1950 and 2005.^[171]

Pregnancy

Because cancer is largely a disease of older adults, it is not common in pregnant women. Cancer affects approximately 1 in 1,000 pregnant women.^[172] The most common cancers found during pregnancy are the same as the most common cancers found in non-pregnant women during childbearing ages: breast cancer, cervical cancer, leukemia, lymphoma, melanoma, ovarian cancer, and colorectal cancer.^[172]

Diagnosing a new cancer in a pregnant woman is difficult, in part because any symptoms are commonly assumed to be a normal discomfort associated with pregnancy.^[172] As a result, cancer is typically discovered at a somewhat later stage than average in many pregnant or recently pregnant women. Some imaging procedures, such as MRIs (magnetic resonance imaging), CT scans, ultrasounds, and mammograms with fetal shielding are considered safe during pregnancy; some others, such as PET scans are not.^[172]

Treatment is generally the same as for non-pregnant women.^[172] However, radiation and radioactive drugs are normally avoided during pregnancy, especially if the fetal dose might exceed 100 cGy. In some cases, some or all treatments are postponed until after birth if the cancer is diagnosed late in the pregnancy. Early deliveries to speed the start of treatment are not uncommon. Surgery is generally safe, but pelvic surgeries during the first trimester may cause miscarriage. Some treatments, especially certain chemotherapy drugs given during the first trimester, increase the risk of birth defects and pregnancy loss (spontaneous abortions and stillbirths).^[172]

Elective abortions are not required and, for the most common forms and stages of cancer, do not improve the likelihood of the mother surviving or being cured.^[172] In a few instances, such as advanced uterine cancer, the pregnancy cannot be continued, and in others, such as an acute leukemia discovered early in pregnancy, the pregnant woman may choose to have abortion so that she can begin aggressive chemotherapy without worrying about birth defects.^[172]

Some treatments may interfere with the mother's ability to give birth vaginally or to breastfeed her baby.^[172] Cervical cancer may require birth by Caesarean section. Radiation to the breast reduces the ability of that breast to produce milk and increases the risk of mastitis. Also, when chemotherapy is being given after birth, many of the drugs pass through breast milk to the baby, which could harm the baby.^[172]

Other animals

In non-humans, a few types of transmissible cancer have been described, wherein the cancer spreads between animals by transmission of the tumor cells themselves. This phenomenon is seen in dogs with Sticker's sarcoma, also known as canine transmissible venereal tumor,^[173] as well as devil facial tumour disease in Tasmanian devils.

Notes

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References

Holland, James F. (2009). Holland-Frei cancer medicine. (8th ed.). New York: McGraw-Hill Medical. ISBN 978-1-60795-014-1.

External links

Wikimedia Commons has media related to Cancer (illness).

Cancer on the Open Directory Project

UpToDate Contents

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1. 原発不明癌の分類およびマネージメントの概要 overview of the classification and management of cancers of unknown primary site
2. 新たに診断された非転移性乳癌の治療の概要 overview of the treatment of newly diagnosed non metastatic breast cancer
3. 精巣癌の長期生存者のケアへのアプローチ approach to the care of long term testicular cancer survivors
4. 頭頸部癌に対する治療の概要 overview of treatment for head and neck cancer
5. 卵巣癌、卵管癌、および腹膜癌：病期分類および初期外科的マネージメント cancer of the ovary fallopian tube and peritoneum staging and initial surgical management

English Journal

Immune surveillance of senescent cells--biological significance in cancer- and non-cancer pathologies.

Hoenicke L, Zender L.SourceHelmholtz Centre for Infection Research, Inhoffenstrasse 7, 38124 Braunschweig, Germany.
Carcinogenesis.Carcinogenesis.2012 Nov;33(6):1123-6. Epub 2012 Apr 2.
Cellular senescence, a state of stable growth arrest, can occur in response to various stress stimuli such as telomere shortening, treatment with chemotherapeutic drugs or the aberrant activation of oncogenes. Senescent cells communicate with their environment by secreting various cytokines and grow
PMID 22470164

Cathepsin D inhibits oxidative stress-induced cell death via activation of autophagy in cancer cells.

Hah YS, Noh HS, Ha JH, Ahn JS, Hahm JR, Cho HY, Kim DR.SourceClinical Research Institute, Gyeongsang National University Hospital, Jinju, Republic of Korea.
Cancer letters.Cancer Lett.2012 Oct 28;323(2):208-14. Epub 2012 Apr 24.
Cathepsin D (CatD), a lysosomal aspartic protease, plays an essential role in tumor progression and apoptosis. However, the function of CatD in cell death is not yet fully understood. In this study, we identified CatD as one of up-regulated proteins in human malignant glioblastoma M059J cells that l
PMID 22542809

Japanese Journal

悪性の経過をたどった類上皮型腎血管筋脂肪腫の1例

石川哲生,伊藤文夫,金光泉,鈴木浩司,中澤速和,藤林真理子
泌尿器科紀要 58(1), 21-24, 2012-01
… Computed tomography showed bilateral renal masses with minimal fat tissue that were unlike classical angiomyolipoma (AML), as well as enlargement of the paraaortic lymph nodes, pleural effusion, and ascites, similar to other advanced malignant neoplasms such as renal cell carcinoma and renal sarcoma. …
NAID 120003796790

陰嚢水腫手術後に診断した陰嚢内悪性中皮腫の1例

加藤隆一,松田洋平,前鼻健志,宮尾則臣,小西康宏,今信一郎
泌尿器科紀要 58(1), 45-48, 2012-01
… We report here a case of intrascrotal malignant mesothelioma, arising from the tunica vaginalis, which was diagnosed after surgery for hydrocele testis. … After pathological diagnosis as malignant mesothelioma from the specimen of tunica vaginalis, left radical orchiectomy was performed. …
NAID 120003796785

Related Pictures

★リンクテーブル★

リンク元	「悪性腫瘍」「腫瘍」
関連記事	「malignant」「tumor」

「悪性腫瘍」

Cancer
	Classification and external resources
	; A coronal CT scan showing a malignant mesothelioma; Legend: → tumor ←, ✱ central pleural effusion, 1 & 3 lungs, 2 spine, 4 ribs, 5 aorta, 6 spleen, 7 & 8 kidneys, 9 liver.
ICD-10	C00—C97
ICD-9	140—239
DiseasesDB	28843
MedlinePlus	001289
MeSH	D009369

　　[★]

英: malignant tumor, malignancy
関: 良性腫瘍、腫瘍
同: 悪性新生物 malignant neoplasm、癌 cancer
関: 組織型分類、臨床進行期分類、TNM分類、pTNM分類

組織学的な特徴

極性の乱れ
壊死 + apoptosis
出血
核分裂の増加　（＋異常核分裂）
細胞密度の増加
間質浸潤 (+腫瘍性間質の形成)
脈管浸潤　（リンパ管、血管）
転移　（リンパ節、他臓器、経気道）

皮膚疾患と悪性腫瘍

合併することがある

水疱性類天疱瘡　→　内臓悪性腫瘍

腫瘍に随伴

腫瘍随伴性天疱瘡

小児がんの部位別分布

米国SEERプログラム 1975-1995 SPE.555

1. 白血病 31%
2. 中枢神経腫瘍 19%
3. リンパ腫 11%
4. 交感神経腫瘍 8%
5. 軟部肉腫 7%
6. 腎腫瘍 6%
7. 悪性骨腫瘍 5%
8. 胚細胞腫瘍 4%
9. がん/上皮性腫瘍 4%
10. 網膜芽細胞腫 3%
11. 肝腫瘍 1%
12. その他 1%

部位別年次別悪性腫瘍による死亡数、死亡率、年齢調整死亡率

参考1

参考

1. 人口動態調査 > 平成22年人口動態統計 > 確定数 > 上巻 > 死亡 > 年次 - 政府統計の総合窓口 GL08020102

http://www.e-stat.go.jp/SG1/estat/GL08020103.do?_toGL08020103_&listID=000001082327&disp=Other&requestSender=dsearch

5-24 悪性新生物の主な部位別にみた性・年次別死亡数及び率（人口10万対）

http://www.e-stat.go.jp/SG1/estat/GL08020103.do?_csvDownload_&fileId=000005009667&releaseCount=1

5-26 悪性新生物の主な部位別にみた性・年次別年齢調整死亡率（人口10万対）

http://www.e-stat.go.jp/SG1/estat/GL08020103.do?_csvDownload_&fileId=000005009671&releaseCount=1

「腫瘍」

　　[★]

英: tumor
同: 新生物 neoplasm new growth NG
関

分類(EPT.65)

悪性度

細胞と間質の割合

発生学的由来

上皮性腫瘍

外胚葉性、中胚葉性、内胚葉性

非上皮性腫瘍

間質由来(中胚葉性)

組織学的分類

上皮性腫瘍

良性腫瘍

悪性腫瘍

癌腫

非上皮性腫瘍

良性腫瘍

線維腫

硬性線維腫
軟性線維腫:線維脂肪腫との区別が困難

脂肪腫

骨髄脂肪腫

悪性腫瘍

肉腫

脂肪腫用脂肪肉腫
粘液性脂肪肉腫
多形性脂肪肉腫
横紋筋肉腫

臓器別分類

外陰部(女性)

子宮

卵巣

卵巣腫瘍

表層上皮性・間質性腫瘍 Surface epithelial-stromal tumors
性索間質性腫瘍 Sex cord/stromal tumors
胚細胞腫瘍 Germ cell tumors

腫瘍と関連する疾患 first aid step1 2006 p.294

「malignant」

　　[★]

adj.

悪性の

関: malignantly、pernicious

「tumor」

　　[★]

n.

腫瘍、腫瘤、腫脹

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The American Society of Clinical Oncology made this recommendation based on various cancers. See American Society of Clinical Oncology. "Five Things Physicians and Patients Should Question". Choosing Wisely: an initiative of the ABIM Foundation (American Society of Clinical Oncology). Retrieved August 14, 2012

for lung cancer, see Azzoli, CG; Temin, S; Aliff, T; Baker, S; Brahmer, J; Johnson, DH; Laskin, JL; Masters, G; Milton, D; Nordquist, L; Pao, W; Pfister, DG; Piantadosi, S; Schiller, JH; Smith, R; Smith, TJ; Strawn, JR; Trent, D; Giaccone, G; American Society of Clinical Oncology (2011). "2011 Focused Update of 2009 American Society of Clinical Oncology Clinical Practice Guideline Update on Chemotherapy for Stage IV Non-Small-Cell Lung Cancer". Journal of clinical oncology : official journal of the American Society of Clinical Oncology 29 (28): 3825–31. doi:10.1200/JCO.2010.34.2774. PMC 3675703. PMID 21900105. and Ettinger, DS; Akerley, W; Bepler, G; Blum, MG; Chang, A; Cheney, RT; Chirieac, LR; d'Amico, TA; Demmy, TL; Ganti, AK; Govindan, R; Grannis Jr, FW; Jahan, T; Jahanzeb, M; Johnson, DH; Kessinger, A; Komaki, R; Kong, FM; Kris, MG; Krug, LM; Le, QT; Lennes, IT; Martins, R; O'Malley, J; Osarogiagbon, RU; Otterson, GA; Patel, JD; Pisters, KM; Reckamp, K; Riely, GJ (2010). "Non-small cell lung cancer". Journal of the National Comprehensive Cancer Network : JNCCN 8 (7): 740–801. PMID 20679538.

for breast cancer, see Carlson, RW; Allred, DC; Anderson, BO; Burstein, HJ; Carter, WB; Edge, SB; Erban, JK; Farrar, WB; Goldstein, LJ; Gradishar, WJ; Hayes, DF; Hudis, CA; Jahanzeb, M; Kiel, K; Ljung, BM; Marcom, PK; Mayer, IA; McCormick, B; Nabell, LM; Pierce, LJ; Reed, EC; Smith, ML; Somlo, G; Theriault, RL; Topham, NS; Ward, JH; Winer, EP; Wolff, AC; NCCN Breast Cancer Clinical Practice Guidelines Panel (2009). "Breast cancer. Clinical practice guidelines in oncology". Journal of the National Comprehensive Cancer Network : JNCCN 7 (2): 122–92. PMID 19200416.

for colon cancer, see Engstrom, PF; Arnoletti, JP; Benson Ab, 3rd; Chen, YJ; Choti, MA; Cooper, HS; Covey, A; Dilawari, RA; Early, DS; Enzinger, PC; Fakih, MG; Fleshman Jr, J; Fuchs, C; Grem, JL; Kiel, K; Knol, JA; Leong, LA; Lin, E; Mulcahy, MF; Rao, S; Ryan, DP; Saltz, L; Shibata, D; Skibber, JM; Sofocleous, C; Thomas, J; Venook, AP; Willett, C; National Comprehensive Cancer Network (2009). "NCCN Clinical Practice Guidelines in Oncology: Colon cancer". Journal of the National Comprehensive Cancer Network : JNCCN 7 (8): 778–831. PMID 19755046.

for other general statements see Smith, Thomas J.; Hillner, Bruce E. (2011). "Bending the Cost Curve in Cancer Care". New England Journal of Medicine 364 (21): 2060–5. doi:10.1056/NEJMsb1013826. PMID 21612477. and Peppercorn, J. M.; Smith, T. J.; Helft, P. R.; Debono, D. J.; Berry, S. R.; Wollins, D. S.; Hayes, D. M.; Von Roenn, J. H.; Schnipper, L. E.; American Society of Clinical Oncology (2011). "American Society of Clinical Oncology Statement: Toward Individualized Care for Patients with Advanced Cancer". Journal of Clinical Oncology 29 (6): 755–60. doi:10.1200/JCO.2010.33.1744. PMID 21263086.

[125] The American Society of Clinical Oncology made this recommendation based on various cancers. See American Society of Clinical Oncology. "Five Things Physicians and Patients Should Question". Choosing Wisely: an initiative of the ABIM Foundation (American Society of Clinical Oncology). Retrieved August 14, 2012

[126] r lung cancer, see Azzoli, CG; Temin, S; Aliff, T; Baker, S; Brahmer, J; Johnson, DH; Laskin, JL; Masters, G; Milton, D; Nordquist, L; Pao, W; Pfister, DG; Piantadosi, S; Schiller, JH; Smith, R; Smith, TJ; Strawn, JR; Trent, D; Giaccone, G; American Society of Clinical Oncology (2011). "2011 Focused Update of 2009 American Society of Clinical Oncology Clinical Practice Guideline Update on Chemotherapy for Stage IV Non-Small-Cell Lung Cancer". Journal of clinical oncology : official journal of the American Society of Clinical Oncology 29 (28): 3825–31. doi:10.1200/JCO.2010.34.2774. PMC 3675703. PMID 21900105. and Ettinger, DS; Akerley, W; Bepler, G; Blum, MG; Chang, A; Cheney, RT; Chirieac, LR; d'Amico, TA; Demmy, TL; Ganti, AK; Govindan, R; Grannis Jr, FW; Jahan, T; Jahanzeb, M; Johnson, DH; Kessinger, A; Komaki, R; Kong, FM; Kris, MG; Krug, LM; Le, QT; Lennes, IT; Martins, R; O'Malley, J; Osarogiagbon, RU; Otterson, GA; Patel, JD; Pisters, KM; Reckamp, K; Riely, GJ (2010). "Non-small cell lung cancer". Journal of the National Comprehensive Cancer Network : JNCCN 8 (7): 740–801. PMID 20679538.

[127] r breast cancer, see Carlson, RW; Allred, DC; Anderson, BO; Burstein, HJ; Carter, WB; Edge, SB; Erban, JK; Farrar, WB; Goldstein, LJ; Gradishar, WJ; Hayes, DF; Hudis, CA; Jahanzeb, M; Kiel, K; Ljung, BM; Marcom, PK; Mayer, IA; McCormick, B; Nabell, LM; Pierce, LJ; Reed, EC; Smith, ML; Somlo, G; Theriault, RL; Topham, NS; Ward, JH; Winer, EP; Wolff, AC; NCCN Breast Cancer Clinical Practice Guidelines Panel (2009). "Breast cancer. Clinical practice guidelines in oncology". Journal of the National Comprehensive Cancer Network : JNCCN 7 (2): 122–92. PMID 19200416.

[128] r colon cancer, see Engstrom, PF; Arnoletti, JP; Benson Ab, 3rd; Chen, YJ; Choti, MA; Cooper, HS; Covey, A; Dilawari, RA; Early, DS; Enzinger, PC; Fakih, MG; Fleshman Jr, J; Fuchs, C; Grem, JL; Kiel, K; Knol, JA; Leong, LA; Lin, E; Mulcahy, MF; Rao, S; Ryan, DP; Saltz, L; Shibata, D; Skibber, JM; Sofocleous, C; Thomas, J; Venook, AP; Willett, C; National Comprehensive Cancer Network (2009). "NCCN Clinical Practice Guidelines in Oncology: Colon cancer". Journal of the National Comprehensive Cancer Network : JNCCN 7 (8): 778–831. PMID 19755046.

[129] r other general statements see Smith, Thomas J.; Hillner, Bruce E. (2011). "Bending the Cost Curve in Cancer Care". New England Journal of Medicine 364 (21): 2060–5. doi:10.1056/NEJMsb1013826. PMID 21612477. and Peppercorn, J. M.; Smith, T. J.; Helft, P. R.; Debono, D. J.; Berry, S. R.; Wollins, D. S.; Hayes, D. M.; Von Roenn, J. H.; Schnipper, L. E.; American Society of Clinical Oncology (2011). "American Society of Clinical Oncology Statement: Toward Individualized Care for Patients with Advanced Cancer". Journal of Clinical Oncology 29 (6): 755–60. doi:10.1200/JCO.2010.33.1744. PMID 21263086.

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Gene	Cancer types
BRCA1, BRCA2	Breast, ovarian, pancreatic
HNPCC, MLH1, MSH2, MSH6, PMS1, PMS2	Colon, uterine, small bowel, stomach, urinary tract

Cancer
Classification and external resources
A coronal CT scan showing a malignant mesothelioma Legend: → tumor ←, ✱ central pleural effusion, 1 & 3 lungs, 2 spine, 4 ribs, 5 aorta, 6 spleen, 7 & 8 kidneys, 9 liver.
ICD-10	C00—C97
ICD-9	140—239
DiseasesDB	28843
MedlinePlus	001289
MeSH	D009369

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malignant tumor

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Signs and symptoms

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★リンクテーブル★

「悪性腫瘍」

組織学的な特徴

皮膚疾患と悪性腫瘍

小児がんの部位別分布

部位別年次別悪性腫瘍による死亡数、死亡率、年齢調整死亡率

参考

「腫瘍」

分類(EPT.65)

悪性度

細胞と間質の割合

発生学的由来

組織学的分類

上皮性腫瘍

良性腫瘍

悪性腫瘍

非上皮性腫瘍

良性腫瘍

悪性腫瘍

臓器別分類

外陰部(女性)

子宮