cancer of the lung

肺癌、肺がん

関

carcinoma of lung、lung cancer、lung carcinoma、lung neoplasm、pulmonary cancer、pulmonary carcinoma、pulmonary neoplasm

WordNet

1. a special situation; "this thing has got to end"; "it is a remarkable thing"
2. a separate and self-contained entity
3. an action; "how could you do such a thing?"
4. an artifact; "how does this thing work?"
5. an entity that is not named specifically; "I couldnt tell what the thing was"
6. any attribute or quality considered as having its own existence; "the thing I like about her is ..."
7. a persistent illogical feeling of desire or aversion; "he has a thing about seafood"; "she has a thing about him"
8. a special abstraction; "a thing of the spirit"; "things of the heart"
9. a special objective; "the thing is to stay in bounds"
10. a statement regarded as an object; "to say the same thing in other terms"; "how can you say such a thing?"
11. an event; "a funny thing happened on the way to the..."
12. type genus of the family Cancridae (同)genus Cancer
13. the fourth sign of the zodiac; the sun is in this sign from about June 21 to July 22 (同)Cancer the Crab, Crab
14. (astrology) a person who is born while the sun is in Cancer (同)Crab
15. a small zodiacal constellation in the northern hemisphere; between Leo and Gemini
16. any malignant growth or tumor caused by abnormal and uncontrolled cell division; it may spread to other parts of the body through the lymphatic system or the blood stream (同)malignant neoplastic disease

PrepTutorEJDIC

1. 〈C〉(形のある)『物』,物体;(生物に対しての)『無生物』 / 〈C〉(形のない)『もの』,事,事柄,でき事 / 《複数形で》事情,事態,状勢,状況 / 《複数形で》(すべての)事物,事柄 / 《通例 the~》(努力・活動などの)目的,目標 / 〈C〉衣服,衣類・《one's things》持ち物,所持品,身の回り品 / 《複数形で》道具,用具・〈C〉《親愛・哀れみ・軽べつなどの感情をこめて》人,者,やつ / 《the~》《話》(…の)流行《+in+名》
2. 《所有・所属》…『の』,…のものである,…に属する・《材料・要素》…『でできた』,から成る・《部分》…『の』[『中の』] ・《数量・単位・種類を表す名詞に付いて》…の・《原因・動機》…『で』,のために(because of) ・《主格関係》…『の』,による,によって・《目的格関係》…『を』,の・《同格関係》…『という』・《関係・関連》…『についての』[『の』],の点で・《抽象名詞などと共に》…の[性質をもつ] ・《『It is』+『形』+『of』+『名』+『to』 doの形で,ofの後の名詞を意味上の主語として》・《分離》…『から』・《起原・出所》…『から』[『の』](out of) ・《『名』+『of』+『a』(『an』)+『名』の形で》…のような・《『名』+『of』+『mine』(『yours, his』など独立所有格)の形で》…の…・《時》(1)《副詞句を作って》…に《形容詞句を作って》…の・《時刻》《米》…前(to,《米》before)
3. 《前述の名詞または文脈でそれと分かる名詞に付けて》『その』,あの,名の / 《唯一の事物に付けて》 / 《方角・自然現象に付けて》 / 《用具・楽器・特定の病気などに付けて》 / 《修飾吾[句]を伴う名詞に付けて》 / 《単数普通名詞に付けて》(1)《種族全体》…『というもの』 / 《複数名詞または集合名詞に付けて》 / 《単位》『…につき;…単位[で]』 / 《身体の一部に付けて,所有格に代わる》 / 《形容詞に付けて》 / 《固有名詞に付けて》 / 《強意用法に》『随一の』,典型的な / 《「the+比較級,the+比較級」の形で》『…すればするほどそれだけ』 / 《比較級の前に》(…につれて,のために)『それだけ』,ますます
4. 〈U〉〈C〉『がん』 / 〈U〉〈C〉害悪 / 《Cancer》(星座の)カニ座

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2017/01/05 02:30:23」(JST)

wiki en

[Wiki en表示]

This article is about lung carcinomas. For other lung tumors, see Lung tumor.

Lung cancer
A chest X-ray showing a tumor in the lung (marked by arrow)
Classification and external resources
Specialty	Oncology
ICD-10	C33-C34
ICD-9-CM	162
OMIM	211980
DiseasesDB	7616
MedlinePlus	007194
eMedicine	med/1333 med/1336 emerg/335 radio/807 radio/405 radio/406
Patient UK	Lung cancer
MeSH	D002283

Lung cancer, also known as lung carcinoma, is a malignant lung tumor characterized by uncontrolled cell growth in tissues of the lung. If left untreated, this growth can spread beyond the lung by the process of metastasis into nearby tissue or other parts of the body. Most cancers that start in the lung, known as primary lung cancers, are carcinomas. The two main types are small-cell lung carcinoma (SCLC) and non-small-cell lung carcinoma (NSCLC). The most common symptoms are coughing (including coughing up blood), weight loss, shortness of breath, and chest pains.

The vast majority (85%) of cases of lung cancer are due to long-term tobacco smoking. About 10–15% of cases occur in people who have never smoked. These cases are often caused by a combination of genetic factors and exposure to radon gas, asbestos, second-hand smoke, or other forms of air pollution. Lung cancer may be seen on chest radiographs and computed tomography (CT) scans. The diagnosis is confirmed by biopsy which is usually performed by bronchoscopy or CT-guidance.

Prevention is by avoiding risk factors including smoking and air pollution. Treatment and long-term outcomes depend on the type of cancer, the stage (degree of spread), and the person's overall health. Most cases are not curable. Common treatments include surgery, chemotherapy, and radiotherapy. NSCLC is sometimes treated with surgery, whereas SCLC usually responds better to chemotherapy and radiotherapy.

Worldwide in 2012, lung cancer occurred in 1.8 million people and resulted in 1.6 million deaths. This makes it the most common cause of cancer-related death in men and second most common in women after breast cancer. The most common age at diagnosis is 70 years. Overall, 17.4% of people in the United States diagnosed with lung cancer survive five years after the diagnosis, while outcomes on average are worse in the developing world.

Signs and symptoms

Signs and symptoms which may suggest lung cancer include:

• Respiratory symptoms: coughing, coughing up blood, wheezing, or shortness of breath
• Systemic symptoms: weight loss, weakness, fever, or clubbing of the fingernails
• Symptoms due to the cancer mass pressing on adjacent structures: chest pain, bone pain, superior vena cava obstruction, or difficulty swallowing

If the cancer grows in the airways, it may obstruct airflow, causing breathing difficulties. The obstruction can lead to accumulation of secretions behind the blockage, and predispose to pneumonia.

Depending on the type of tumor, paraneoplastic phenomena—symptoms not due to the local presence of cancer—may initially attract attention to the disease. In lung cancer, these phenomena may include hypercalcemia, syndrome of inappropriate antidiuretic hormone (SIADH, abnormally concentrated urine and diluted blood), ectopic ACTH production, or Lambert–Eaton myasthenic syndrome (muscle weakness due to autoantibodies). Tumors in the top of the lung, known as Pancoast tumors, may invade the local part of the sympathetic nervous system, leading to Horner's syndrome (dropping of the eyelid and a small pupil on that side), as well as damage to the brachial plexus.

Many of the symptoms of lung cancer (poor appetite, weight loss, fever, fatigue) are not specific. In many people, the cancer has already spread beyond the original site by the time they have symptoms and seek medical attention. Symptoms that suggest the presence of metastatic disease include weight loss, bone pain and neurological symptoms (headaches, fainting, convulsions, or limb weakness). Common sites of spread include the brain, bone, adrenal glands, opposite lung, liver, pericardium, and kidneys. About 10% of people with lung cancer do not have symptoms at diagnosis; these cancers are incidentally found on routine chest radiography.

Causes

Graph showing how a general increase in sales of tobacco products in the USA in the first four decades of the 20th century (cigarettes per person per year) led to a corresponding rapid increase in the rate of lung cancer during the 1930s, '40s and '50s (lung cancer deaths per 100,000 male population per year)

Risk of death from lung cancer is strongly correlated with smoking

Cancer develops following genetic damage to DNA and epigenetic changes. These changes affect the normal functions of the cell, including cell proliferation, programmed cell death (apoptosis) and DNA repair. As more damage accumulates, the risk of cancer increases.

Smoking

Smoking, particularly of cigarettes, is by far the main contributor to lung cancer. Cigarette smoke contains at least 73 known carcinogens, including benzo[a]pyrene, NNK, 1,3-butadiene and a radioactive isotope of polonium, polonium-210. Across the developed world, 90% of lung cancer deaths in men during the year 2000 were attributed to smoking (70% for women). Smoking accounts for about 85% of lung cancer cases.

Passive smoking—the inhalation of smoke from another's smoking—is a cause of lung cancer in nonsmokers. A passive smoker can be defined as someone living or working with a smoker. Studies from the US, Europe and the UK have consistently shown a significantly increased risk among those exposed to passive smoke. Those who live with someone who smokes have a 20–30% increase in risk while those who work in an environment with secondhand smoke have a 16–19% increase in risk. Investigations of sidestream smoke suggest it is more dangerous than direct smoke. Passive smoking causes about 3,400 deaths from lung cancer each year in the USA.

Marijuana smoke contains many of the same carcinogens as those in tobacco smoke. However, the effect of smoking cannabis on lung cancer risk is not clear. A 2013 review did not find an increased risk from light to moderate use. A 2014 review found that smoking cannabis doubled the risk of lung cancer.

Radon gas

Radon is a colourless and odorless gas generated by the breakdown of radioactive radium, which in turn is the decay product of uranium, found in the Earth's crust. The radiation decay products ionize genetic material, causing mutations that sometimes turn cancerous. Radon is the second-most common cause of lung cancer in the USA, causing about 21,000 deaths each year. The risk increases 8–16% for every 100 Bq/m³ increase in the radon concentration. Radon gas levels vary by locality and the composition of the underlying soil and rocks. About one in 15 homes in the US has radon levels above the recommended guideline of 4 picocuries per liter (pCi/l) (148 Bq/m³).

Asbestos

Asbestos can cause a variety of lung diseases, including lung cancer. Tobacco smoking and asbestos have a synergistic effect on the formation of lung cancer. In smokers who work with asbestos, the risk of lung cancer is increased 45-fold compared to the general population. Asbestos can also cause cancer of the pleura, called mesothelioma (which is different from lung cancer).

Air pollution

Outdoor air pollutants, especially chemicals released from the burning of fossil fuels, increase the risk of lung cancer. Fine particulates (PM_2.5) and sulfate aerosols, which may be released in traffic exhaust fumes, are associated with slightly increased risk. For nitrogen dioxide, an incremental increase of 10 parts per billion increases the risk of lung cancer by 14%. Outdoor air pollution is estimated to account for 1–2% of lung cancers.

Tentative evidence supports an increased risk of lung cancer from indoor air pollution related to the burning of wood, charcoal, dung or crop residue for cooking and heating. Women who are exposed to indoor coal smoke have about twice the risk and a number of the by-products of burning biomass are known or suspected carcinogens. This risk affects about 2.4 billion people globally, and is believed to account for 1.5% of lung cancer deaths.

Genetics

About 8% of lung cancer is due to inherited factors. In relatives of people with lung cancer, the risk is doubled. This is likely due to a combination of genes. Polymorphisms on chromosomes 5, 6 and 15 are known to affect the risk of lung cancer.

Other causes

Numerous other substances, occupations, and environmental exposures have been linked to lung cancer. The International Agency for Research on Cancer (IARC) states there is "sufficient evidence" to show the following are carcinogenic in the lungs:

• Some metals (aluminum production, cadmium and cadmium compounds, chromium(VI) compounds, beryllium and beryllium compounds, iron and steel founding, nickel compounds, arsenic and inorganic arsenic compounds, underground hematite mining)
• Some products of combustion (incomplete combustion, coal (indoor emissions from household coal burning), coal gasification, coal-tar pitch, coke production, soot, diesel engine exhaust)
• Ionizing radiation (X-radiation, gamma radiation, plutonium)
• Some toxic gases (methyl ether (technical grade), Bis-(chloromethyl) ether, sulfur mustard, MOPP (vincristine-prednisone-nitrogen mustard-procarbazine mixture), fumes from painting)
• Rubber production and crystalline silica dust

Pathogenesis

See also: Carcinogenesis

False-color scanning electron micrograph of a lung cancer cell dividing

Similar to many other cancers, lung cancer is initiated by activation of oncogenes or inactivation of tumor suppressor genes. Carcinogens cause mutations in these genes which induce the development of cancer.

Mutations in the K-ras proto-oncogene are responsible for 10–30% of lung adenocarcinomas. About 4% of non-small-cell lung carcinomas involve an EML4-ALK tyrosine kinase fusion gene.

Epigenetic changes—such as alteration of DNA methylation, histone tail modification, or microRNA regulation—may lead to inactivation of tumor suppressor genes.

The epidermal growth factor receptor (EGFR) regulates cell proliferation, apoptosis, angiogenesis, and tumor invasion. Mutations and amplification of EGFR are common in non-small-cell lung carcinoma and provide the basis for treatment with EGFR-inhibitors. Her2/neu is affected less frequently. Other genes that are often mutated or amplified are c-MET, NKX2-1, LKB1, PIK3CA, and BRAF.

The cell lines of origin are not fully understood. The mechanism may involve abnormal activation of stem cells. In the proximal airways, stem cells that express keratin 5 are more likely to be affected, typically leading to squamous-cell lung carcinoma. In the middle airways, implicated stem cells include club cells and neuroepithelial cells that express club cell secretory protein. Small-cell lung carcinoma may be derived from these cell lines or neuroendocrine cells, and may express CD44.

Metastasis of lung cancer requires transition from epithelial to mesenchymal cell type. This may occur through activation of signaling pathways such as Akt/GSK3Beta, MEK-ERK, Fas, and Par6.

Diagnosis

CT scan showing a cancerous tumor in the left lung

Performing a chest radiograph is one of the first investigative steps if a person reports symptoms that may suggest lung cancer. This may reveal an obvious mass, widening of the mediastinum (suggestive of spread to lymph nodes there), atelectasis (collapse), consolidation (pneumonia) or pleural effusion. CT imaging is typically used to provide more information about the type and extent of disease. Bronchoscopy or CT-guided biopsy is often used to sample the tumor for histopathology.

Lung cancer often appears as a solitary pulmonary nodule on a chest radiograph. However, the differential diagnosis is wide. Many other diseases can also give this appearance, including metastatic cancer, hamartomas, and infectious granulomas such as tuberculosis, histoplasmosis and coccidioidomycosis. Lung cancer can also be an incidental finding, as a solitary pulmonary nodule on a chest radiograph or CT scan done for an unrelated reason. The definitive diagnosis of lung cancer is based on histological examination of the suspicious tissue in the context of the clinical and radiological features.

Clinical practice guidelines recommend frequencies for pulmonary nodule surveillance. CT imaging should not be used for longer or more frequently than indicated as extended surveillance exposes people to increased radiation.

Classification

Pie chart showing incidences of non-small cell lung cancers as compared to small cell carcinoma shown at right, with fractions of smokers versus non-smokers shown for each type.

Age-adjusted incidence of lung cancer by histological type

Histological type	Incidence per 100,000 per year
All types	66.9
Adenocarcinoma	22.1
Squamous-cell carcinoma	14.4
Small-cell carcinoma	9.8

Lung cancers are classified according to histological type. This classification is important for determining management and predicting outcomes of the disease. Lung cancers are carcinomas—malignancies that arise from epithelial cells. Lung carcinomas are categorized by the size and appearance of the malignant cells seen by a histopathologist under a microscope. For therapeutic purposes, two broad classes are distinguished: non-small-cell lung carcinoma and small-cell lung carcinoma.

Non-small-cell lung carcinoma

Micrograph of squamous-cell carcinoma, a type of non-small-cell carcinoma, FNA specimen, Pap stain

The three main subtypes of NSCLC are adenocarcinoma, squamous-cell carcinoma and large-cell carcinoma.

Nearly 40% of lung cancers are adenocarcinoma, which usually originates in peripheral lung tissue. Although most cases of adenocarcinoma are associated with smoking, adenocarcinoma is also the most common form of lung cancer among people who have smoked fewer than 100 cigarettes in their lifetimes ("never-smokers") and ex-smokers with a modest smoking history. A subtype of adenocarcinoma, the bronchioloalveolar carcinoma, is more common in female never-smokers, and may have a better long-term survival.

Squamous-cell carcinoma accounts for about 30% of lung cancers. They typically occur close to large airways. A hollow cavity and associated cell death are commonly found at the center of the tumor. About 9% of lung cancers are large-cell carcinoma. These are so named because the cancer cells are large, with excess cytoplasm, large nuclei and conspicuous nucleoli.

Small-cell lung carcinoma

Small-cell lung carcinoma (microscopic view of a core needle biopsy)

In small-cell lung carcinoma (SCLC), the cells contain dense neurosecretory granules (vesicles containing neuroendocrine hormones), which give this tumor an endocrine/paraneoplastic syndrome association. Most cases arise in the larger airways (primary and secondary bronchi). Sixty to seventy percent have extensive disease (which cannot be targeted within a single radiation therapy field) at presentation.

Others

Four main histological subtypes are recognised, although some cancers may contain a combination of different subtypes, such as adenosquamous carcinoma. Rare subtypes include carcinoid tumors, bronchial gland carcinomas and sarcomatoid carcinomas.

Metastasis

Typical Napsin-A and TTF-1 immunostaining in primary lung carcinoma

Histological type	Napsin-A	TTF-1
Squamous-cell carcinoma	Negative	Negative
Adenocarcinoma	Positive	Positive
Small-cell carcinoma	Negative	Positive

The lung is a common place for the spread of tumors from other parts of the body. Secondary cancers are classified by the site of origin; e.g., breast cancer that has spread to the lung is called metastatic breast cancer. Metastases often have a characteristic round appearance on chest radiograph.

Primary lung cancers themselves most commonly metastasize to the brain, bones, liver and adrenal glands. Immunostaining of a biopsy is often helpful to determine the original source. The presence of Napsin-A, TTF-1, CK7 and CK20 are helpful in confirming the subtype of lung carcinoma. SCLC derived from neuroendocrine cells may express CD56, neural cell adhesion molecule, synaptophysin or chromogranin.

Staging

See also: Lung cancer staging

Lung cancer staging is an assessment of the degree of spread of the cancer from its original source. It is one of the factors affecting the prognosis and potential treatment of lung cancer.

The evaluation of non-small-cell lung carcinoma (NSCLC) staging uses the TNM classification. This is based on the size of the primary tumor, lymph node involvement, and distant metastasis.

TNM classification in lung cancer

T: Primary tumor TX Any of: Primary tumor cannot be assessed Tumor cells present in sputum or bronchial washing, but tumor not seen with imaging or bronchoscopy T0 No evidence of primary tumor Tis Carcinoma in situ T1 Tumor size less than or equal to 3 cm across, surrounded by lung or visceral pleura, without invasion proximal to the lobar bronchus T1a Tumor size less than or equal to 2 cm across T1b Tumor size more than 2 cm but less than or equal to 3 cm across T2 Any of: Tumor size more than 3 cm but less than or equal to 7 cm across Involvement of the main bronchus at least 2 cm distal to the carina Invasion of visceral pleura Atelectasis/obstructive pneumonitis extending to the hilum but not involving the whole lung T2a Tumor size more than 3 cm but less than or equal to 5 cm across T2b Tumor size more than 5 cm but less than or equal to 7 cm across T3 Any of: Tumor size more than 7 cm across Invasion into the chest wall, diaphragm, phrenic nerve, mediastinal pleura or parietal pericardium Tumor less than 2 cm distal to the carina, but not involving the carina Atelectasis/obstructive pneumonitis of the whole lung Separate tumor nodule in the same lobe T4 Any of: Invasion of the mediastinum, heart, great vessels, trachea, carina, recurrent laryngeal nerve, esophagus, or vertebra Separate tumor nodule in a different lobe of the same lung

N: Lymph nodes NX Regional lymph nodes cannot be assessed N0 No regional lymph node metastasis N1 Metastasis to ipsilateral peribronchial and/or hilar lymph nodes N2 Metastasis to ipsilateral mediastinal and/or subcarinal lymph nodes N3 Any of: Metastasis to scalene or supraclavicular lymph nodes Metastasis to contralateral hilar or mediastinal lymph nodes

M: Metastasis MX Distant metastasis cannot be assessed M0 No distant metastasis M1a Any of: Separate tumor nodule in the other lung Tumor with pleural nodules Malignant pleural or pericardial effusion M1b Distant metastasis

Using the TNM descriptors, a group is assigned, ranging from occult cancer, through stages 0, IA (one-A), IB, IIA, IIB, IIIA, IIIB and IV (four). This stage group assists with the choice of treatment and estimation of prognosis.

Stage group according to TNM classification in lung cancer

TNM	Stage group
T1a–T1b N0 M0	IA
T2a N0 M0	IB
T1a–T2a N1 M0	IIA
T2b N0 M0
T2b N1 M0	IIB
T3 N0 M0
T1a–T3 N2 M0	IIIA
T3 N1 M0
T4 N0–N1 M0
N3 M0	IIIB
T4 N2 M0
M1	IV

Small-cell lung carcinoma (SCLC) has traditionally been classified as "limited stage" (confined to one-half of the chest and within the scope of a single tolerable radiotherapy field) or "extensive stage" (more widespread disease). However, the TNM classification and grouping are useful in estimating prognosis.

For both NSCLC and SCLC, the two general types of staging evaluations are clinical staging and surgical staging. Clinical staging is performed prior to definitive surgery. It is based on the results of imaging studies (such as CT scans and PET scans) and biopsy results. Surgical staging is evaluated either during or after the operation and is based on the combined results of surgical and clinical findings, including surgical sampling of thoracic lymph nodes.

• Diagrams of main features of staging
• Stage IA and IB lung cancer

• Stage IIA lung cancer

• Stage IIB lung cancer

• One option for stage IIB lung cancer, with T2b; but if tumor is within 2 cm of the carina, this is stage 3

• Stage IIIA lung cancer

• Stage IIIA lung cancer, if there is one feature from the list on each side

• Stage IIIA lung cancer

• Stage IIIB lung cancer

• Stage IIIB lung cancer

• Stage IV lung cancer

Prevention

Cross section of a human lung: The white area in the upper lobe is cancer; the black areas are discoloration due to smoking.

Smoking prevention and smoking cessation are effective ways of preventing the development of lung cancer.

Smoking ban

See also: Smoking ban

While in most countries industrial and domestic carcinogens have been identified and banned, tobacco smoking is still widespread. Eliminating tobacco smoking is a primary goal in the prevention of lung cancer, and smoking cessation is an important preventive tool in this process.

Policy interventions to decrease passive smoking in public areas such as restaurants and workplaces have become more common in many Western countries. Bhutan has had a complete smoking ban since 2005 while India introduced a ban on smoking in public in October 2008. The World Health Organization has called for governments to institute a total ban on tobacco advertising to prevent young people from taking up smoking. They assess that such bans have reduced tobacco consumption by 16% where instituted.

Screening

Main article: Lung cancer screening

Cancer screening uses medical tests to detect disease in large groups of people who have no symptoms. For individuals with high risk of developing lung cancer, computed tomography (CT) screening can detect cancer and give a person options to respond to it in a way that prolongs life. This form of screening reduces the chance of death from lung cancer by an absolute amount of 0.3% (relative amount of 20%). High risk people are those age 55–74 who have smoked equivalent amount of a pack of cigarettes daily for 30 years including time within the past 15 years.

CT screening is associated with a high rate of falsely positive tests which may result in unneeded treatment. For each true positive scan there are about 19 falsely positives scans. Other concerns include radiation exposure and the cost of testing along with follow up. Research has not found two other available tests—sputum cytology or chest radiograph (CXR) screening tests—to have any benefit.

The United States Preventive Services Task Force (USPSTF) recommends yearly screening using low-dose computed tomography in those who have a total smoking history of 30 pack-years and are between 55 and 80 years old until a person has not been smoking for more than 15 years. Screening should not be done in those with other health problems that would make treatment of lung cancer if found not an option. The English National Health Service was in 2014 re-examining the evidence for screening.

Other prevention strategies

The long-term use of supplemental vitamin A, vitamin C, vitamin D or vitamin E does not reduce the risk of lung cancer. Some studies suggest that people who eat diets with a higher proportion of vegetables and fruit tend to have a lower risk, but this may be due to confounding—with the lower risk actually due to the association of a high fruit/vegetables diet with less smoking. More rigorous studies have not demonstrated a clear association between diet and lung cancer risk.

Management

Main article: Treatment of lung cancer

Treatment for lung cancer depends on the cancer's specific cell type, how far it has spread, and the person's performance status. Common treatments include palliative care, surgery, chemotherapy, and radiation therapy. Targeted therapy of lung cancer is growing in importance for advanced lung cancer.

Surgery

Main article: Lung cancer surgery

Pneumonectomy specimen containing a squamous-cell carcinoma, seen as a white area near the bronchi

If investigations confirm NSCLC, the stage is assessed to determine whether the disease is localized and amenable to surgery or if it has spread to the point where it cannot be cured surgically. CT scan and positron emission tomography are used for this determination. If mediastinal lymph node involvement is suspected, the nodes may be sampled to assist staging. Techniques used for this include transthoracic needle aspiration, transbronchial needle aspiration (with or without endobronchial ultrasound), endoscopic ultrasound with needle aspiration, mediastinoscopy, and thoracoscopy. Blood tests and pulmonary function testing are used to assess whether a person is well enough for surgery. If pulmonary function tests reveal poor respiratory reserve, surgery may not be possible.

In most cases of early-stage NSCLC, removal of a lobe of lung (lobectomy) is the surgical treatment of choice. In people who are unfit for a full lobectomy, a smaller sublobar excision (wedge resection) may be performed. However, wedge resection has a higher risk of recurrence than lobectomy. Radioactive iodine brachytherapy at the margins of wedge excision may reduce the risk of recurrence. Rarely, removal of a whole lung (pneumonectomy) is performed. Video-assisted thoracoscopic surgery (VATS) and VATS lobectomy use a minimally invasive approach to lung cancer surgery. VATS lobectomy is equally effective compared to conventional open lobectomy, with less postoperative illness.

In SCLC, chemotherapy and/or radiotherapy is typically used. However the role of surgery in SCLC is being reconsidered. Surgery might improve outcomes when added to chemotherapy and radiation in early stage SCLC.

Radiotherapy

Radiotherapy is often given together with chemotherapy, and may be used with curative intent in people with NSCLC who are not eligible for surgery. This form of high-intensity radiotherapy is called radical radiotherapy. A refinement of this technique is continuous hyperfractionated accelerated radiotherapy (CHART), in which a high dose of radiotherapy is given in a short time period. Postoperative thoracic radiotherapy generally should not be used after curative intent surgery for NSCLC. Some people with mediastinal N2 lymph node involvement might benefit from post-operative radiotherapy.

For potentially curable SCLC cases, chest radiotherapy is often recommended in addition to chemotherapy.

Internal radiotherapy for lung cancer given via the airway.

If cancer growth blocks a short section of bronchus, brachytherapy (localized radiotherapy) may be given directly inside the airway to open the passage. Compared to external beam radiotherapy, brachytherapy allows a reduction in treatment time and reduced radiation exposure to healthcare staff. Evidence for brachytherapy, however, is less than that for external beam radiotherapy.

Prophylactic cranial irradiation (PCI) is a type of radiotherapy to the brain, used to reduce the risk of metastasis. PCI is most useful in SCLC. In limited-stage disease, PCI increases three-year survival from 15% to 20%; in extensive disease, one-year survival increases from 13% to 27%.

Recent improvements in targeting and imaging have led to the development of stereotactic radiation in the treatment of early-stage lung cancer. In this form of radiotherapy, high doses are delivered over a number of sessions using stereotactic targeting techniques. Its use is primarily in patients who are not surgical candidates due to medical comorbidities.

For both NSCLC and SCLC patients, smaller doses of radiation to the chest may be used for symptom control (palliative radiotherapy).

Chemotherapy

The chemotherapy regimen depends on the tumor type. Small-cell lung carcinoma (SCLC), even relatively early stage disease, is treated primarily with chemotherapy and radiation. In SCLC, cisplatin and etoposide are most commonly used. Combinations with carboplatin, gemcitabine, paclitaxel, vinorelbine, topotecan, and irinotecan are also used. In advanced non-small cell lung carcinoma (NSCLC), chemotherapy improves survival and is used as first-line treatment, provided the person is well enough for the treatment. Typically, two drugs are used, of which one is often platinum-based (either cisplatin or carboplatin). Other commonly used drugs are gemcitabine, paclitaxel, docetaxel, pemetrexed, etoposide or vinorelbine.

Adjuvant chemotherapy refers to the use of chemotherapy after apparently curative surgery to improve the outcome. In NSCLC, samples are taken of nearby lymph nodes during surgery to assist staging. If stage II or III disease is confirmed, adjuvant chemotherapy improves survival by 5% at five years. The combination of vinorelbine and cisplatin is more effective than older regimens. Adjuvant chemotherapy for people with stage IB cancer is controversial, as clinical trials have not clearly demonstrated a survival benefit. Chemotherapy before surgery in NSCLC that can be removed surgically also appears to improve outcomes.

Chemotherapy may be combined with palliative care in the treatment of the NSCLC. In advanced cases, appropriate chemotherapy improves average survival over supportive care alone, as well as improving quality of life. With adequate physical fitness maintaining chemotherapy during lung cancer palliation offers 1.5 to 3 months of prolongation of survival, symptomatic relief, and an improvement in quality of life, with better results seen with modern agents. The NSCLC Meta-Analyses Collaborative Group recommends if the recipient wants and can tolerate treatment, then chemotherapy should be considered in advanced NSCLC.

Targeted therapy

Several drugs that target molecular pathways in lung cancer are available, especially for the treatment of advanced disease. Erlotinib, gefitinib and afatinib inhibit tyrosine kinase at the epidermal growth factor receptor. Denosumab is a monoclonal antibody directed against receptor activator of nuclear factor kappa-B ligand. It may be useful in the treatment of bone metastases.

Bronchoscopy

Several treatments can be administered via bronchoscopy for the management of airway obstruction or bleeding. If an airway becomes obstructed by cancer growth, options include rigid bronchoscopy, balloon bronchoplasty, stenting, and microdebridement. Laser photosection involves the delivery of laser light inside the airway via a bronchoscope to remove the obstructing tumor.

Palliative care

Palliative care when added to usual cancer care benefits people even when they are still receiving chemotherapy. These approaches allow additional discussion of treatment options and provide opportunities to arrive at well-considered decisions. Palliative care may avoid unhelpful but expensive care not only at the end of life, but also throughout the course of the illness. For individuals who have more advanced disease, hospice care may also be appropriate.

Prognosis

Outcomes in lung cancer according to clinical stage

Clinical stage	Five-year survival (%)
	Non-small-cell lung carcinoma	Small-cell lung carcinoma
IA	50	38
IB	47	21
IIA	36	38
IIB	26	18
IIIA	19	13
IIIB	7	9
IV	2	1

Of all people with lung cancer in the US, 16.8% survive for at least five years after diagnosis. In England and Wales, between 2010 and 2011, overall five-year survival for lung cancer was estimated at 9.5%. Outcomes are generally worse in the developing world. Stage is often advanced at the time of diagnosis. At presentation, 30–40% of cases of NSCLC are stage IV, and 60% of SCLC are stage IV. Survival for lung cancer falls as the stage at diagnosis becomes more advanced: the English data suggest that around 70% of patients survive at least a year when diagnosed at the earliest stage, but this falls to just 14% for those diagnosed with the most advanced disease.

Prognostic factors in NSCLC include presence of pulmonary symptoms, large tumor size (>3 cm), nonsquamous cell type (histology), degree of spread (stage) and metastases to multiple lymph nodes, and vascular invasion. For people with inoperable disease, outcomes are worse in those with poor performance status and weight loss of more than 10%. Prognostic factors in small cell lung cancer include performance status, gender, stage of disease, and involvement of the central nervous system or liver at the time of diagnosis.

For NSCLC, the best prognosis is achieved with complete surgical resection of stage IA disease, with up to 70% five-year survival. People with extensive-stage SCLC have an average five-year survival rate of less than 1%. The average survival time for limited-stage disease is 20 months, with a five-year survival rate of 20%.

According to data provided by the National Cancer Institute, the median age at diagnosis of lung cancer in the United States is 70 years, and the median age at death is 72 years. In the US, people with medical insurance are more likely to have a better outcome.

Epidemiology

Trachea, bronchus, and lung cancers deaths per million person in 2012

  0–7

  8–12

  13–32

  33–53

  54–81

  82–125

  126–286

  287–398

  399–527

  528–889

Lung cancer distribution for white males in the United States

Lung cancer, incidence, mortality and survival, England 1971–2011

Worldwide, lung cancer is the most common cancer among men in terms of both incidence and mortality, and among women has the third highest incidence, and is second after breast cancer in mortality. In 2012, there were 1.82 million new cases globally, and 1.56 million deaths due to lung cancer, representing 19.4% of all deaths from cancer. The highest rates are in North America, Europe and East Asia, with over a third of new cases in 2012 in China. Rates in Africa and South Asia are much lower.

The population segment most likely to develop lung cancer is people aged over 50 who have a history of smoking. In contrast to the mortality rate in men, which began declining more than 20 years ago, women's lung cancer mortality rates have been rising over the last decades, and are just recently beginning to stabilize. In the USA, the lifetime risk of developing lung cancer is 8% in men and 6% in women.

For every 3–4 million cigarettes smoked, one lung cancer death occurs. The influence of "Big Tobacco" plays a significant role in the smoking culture. Young nonsmokers who see tobacco advertisements are more likely to take up smoking. The role of passive smoking is increasingly being recognized as a risk factor for lung cancer, leading to policy interventions to decrease undesired exposure of nonsmokers to others' tobacco smoke.

In the United States, black men and women have a higher incidence. Lung cancer rates are currently lower in developing countries. With increased smoking in developing countries, the rates are expected to increase in the next few years, notably in China and India.

In the United States military veterans have a 25–50% higher rate of lung cancer primarily due to higher rates of smoking. During World War Two and the Korean War asbestos also played a part and Agent Orange may have caused some problems during the Vietnam War.

Lung cancer is the third most common cancer in the UK (around 46,400 people were diagnosed with the disease in 2014), and it is the most common cause of cancer death (around 35,900 people died in 2014).

From the 1960s, the rates of lung adenocarcinoma started to rise relative to other types of lung cancer. This is partly due to the introduction of filter cigarettes. The use of filters removes larger particles from tobacco smoke, thus reducing deposition in larger airways. However, the smoker has to inhale more deeply to receive the same amount of nicotine, increasing particle deposition in small airways where adenocarcinoma tends to arise. The incidence of lung adenocarcinoma continues to rise.

History

See also: Timeline of lung cancer

Lung cancer was uncommon before the advent of cigarette smoking; it was not even recognized as a distinct disease until 1761. Different aspects of lung cancer were described further in 1810. Malignant lung tumors made up only 1% of all cancers seen at autopsy in 1878, but had risen to 10–15% by the early 1900s. Case reports in the medical literature numbered only 374 worldwide in 1912, but a review of autopsies showed the incidence of lung cancer had increased from 0.3% in 1852 to 5.66% in 1952. In Germany in 1929, physician Fritz Lickint recognized the link between smoking and lung cancer, which led to an aggressive antismoking campaign. The British Doctors' Study, published in the 1950s, was the first solid epidemiological evidence of the link between lung cancer and smoking. As a result, in 1964 the Surgeon General of the United States recommended smokers should stop smoking.

The connection with radon gas was first recognized among miners in the Ore Mountains near Schneeberg, Saxony. Silver has been mined there since 1470, and these mines are rich in uranium, with its accompanying radium and radon gas. Miners developed a disproportionate amount of lung disease, eventually recognized as lung cancer in the 1870s. Despite this discovery, mining continued into the 1950s, due to the USSR's demand for uranium. Radon was confirmed as a cause of lung cancer in the 1960s.

The first successful pneumonectomy for lung cancer was performed in 1933. Palliative radiotherapy has been used since the 1940s. Radical radiotherapy, initially used in the 1950s, was an attempt to use larger radiation doses in patients with relatively early-stage lung cancer, but who were otherwise unfit for surgery. In 1997, continuous hyperfractionated accelerated radiotherapy was seen as an improvement over conventional radical radiotherapy. With small-cell lung carcinoma, initial attempts in the 1960s at surgical resection and radical radiotherapy were unsuccessful. In the 1970s, successful chemotherapy regimens were developed.

Research directions

Current research directions for lung cancer treatment include immunotherapy, which encourages the body's immune system to attack the tumor cells, epigenetics, and new combinations of chemotherapy and radiotherapy, both on their own and together. Many of these new treatments work through immune checkpoint blockade, disrupting cancer's ability to evade the immune system.

Ipilimumab blocks signaling through a receptor on T cells known as CTLA-4 which dampens down the immune system. It has been approved by the U.S. Food and Drug Administration (FDA) for treatment of melanoma and is undergoing clinical trials for both non-small cell lung cancer (NSCLC) and small cell lung cancer (SCLC).

Other immunotherapy treatments interfere with the binding of programmed cell death 1 (PD-1) protein with its ligand PD-1 ligand 1 (PD-L1). Signaling through PD-1 inactivates T cells. Some cancer cells appear to exploit this by expressing PD-L1 in order to switch off T cells that might recognise them as a threat. Monoclonal antibodies targeting both PD-1 and PD-L1, such as pembrolizumab and nivolumab are currently in clinical trials for treatment for lung cancer.

Epigenetics is the study of small, usually heritable, molecular modifications—or "tags"—that bind DNA and modify gene expression levels. Targeting these tags with drugs can kill cancer cells. Early-stage research in NSCLC using drugs aimed at epigenetic modifications shows that blocking more than one of these tags can kill cancer cells with fewer side effects. Studies also show that giving patients these drugs before standard treatment can improve its effectiveness. Clinical trials are underway to evaluate how well these drugs kill lung cancer cells in humans. Several drugs that target epigenetic mechanisms are in development. Histone deacetylase inhibitors in development include valproic acid, vorinostat, belinostat, panobinostat, entinostat, and romidepsin. DNA methyltransferase inhibitors in development include decitabine, azacytidine, and hydralazine.

The TRACERx project is looking at how NSCLC develops and evolves, and how these tumors become resistant to treatment. The project will look at tumor samples from 850 NSCLC patients at various stages including diagnosis, after first treatment, post-treatment, and relapse. By studying samples at different points of tumor development, the researchers hope to identify the changes that drive tumor growth and resistance to treatment. The results of this project will help scientists and doctors gain a better understanding of NSCLC and potentially lead to the development of new treatments for the disease.

For lung cancer cases that develop resistance to epidermal growth factor receptor (EGFR) and anaplastic lymphoma kinase (ALK) tyrosine kinase inhibitors, new drugs are in development. New EGFR inhibitors include afatinib and dacomitinib. An alternative signaling pathway, c-Met, can be inhibited by tivantinib and onartuzumab. New ALK inhibitors include crizotinib and ceritinib.

References

External links

• Lung cancer at DMOZ

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

• 1. 肺癌の危険因子、病理、および臨床症状の概要 overview of the risk factors pathology and clinical manifestations of lung cancer
• 2. 肺癌の初期評価、治療、および予後の概要 overview of the initial evaluation treatment and prognosis of lung cancer
• 3. 肺癌が疑われる患者の初期評価、診断、および病期分類の概要 overview of the initial evaluation diagnosis and staging of patients with suspected lung cancer
• 4. ステージI～II非小細胞肺癌のマネージメント management of stage i and stage ii non small cell lung cancer
• 5. 進行非小細胞肺癌の治療の役割 overview of the treatment of advanced non small cell lung cancer

English Journal

• HLA typing from RNA-Seq sequence reads.

• Boegel S, Löwer M, Schäfer M, Bukur T, de Graaf J, Boisguérin V, Türeci O, Diken M, Castle JC, Sahin U.SourceTRON - Translational Oncology at the University Medical Center of the Johannes Gutenberg University, Langenbeckstrasse 1, Building 708, 55131 Mainz, Germany. john.castle@tron-mainz.de.
• Genome medicine.Genome Med.2013 Dec 22;4(12):102. [Epub ahead of print]
• ABSTRACT: We present a method, seq2HLA, for obtaining an individual's human leukocyte antigen (HLA) class I and II type and expression using standard next generation sequencing RNA-Seq data. RNA-Seq reads are mapped against a reference database of HLA alleles, and HLA type, confidence score and locu
• PMID 23259685

• Neferine from Nelumbo nucifera induces autophagy through the inhibition of PI3K/Akt/mTOR pathway and ROS hyper generation in A549 cells.

• Poornima P, Weng CF, Padma VV.SourceAnimal Tissue Culture and Molecular Genetics Laboratory, Department of Biotechnology, School of Biotechnology and Genetic Engineering, Bharathiar University, Coimbatore 641046, Tamilnadu, India.
• Food chemistry.Food Chem.2013 Dec 15;141(4):3598-605. doi: 10.1016/j.foodchem.2013.05.138. Epub 2013 Jun 7.
• Previously we have reported that neferine from the medicinal plant Nelumbo nucifera, inhibited cancer cell proliferation by inducing apoptosis. The present study was focused on the action mechanism of neferine in inducing autophagy in lung cancer cells. Neferine markedly inhibited A549 cell prolifer
• PMID 23993526

• Epidermal growth factor receptor tyrosine kinase inhibitors as initial therapy for non-small cell lung cancer: Focus on epidermal growth factor receptor mutation testing and mutation-positive patients.

• Roengvoraphoj M, Tsongalis GJ, Dragnev KH, Rigas JR.SourceComprehensive Thoracic Oncology Program, Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, One Medical Center Drive, Lebanon, NH 03756-0001, USA; The Geisel School of Medicine at Dartmouth, One Rope Ferry Road, Hanover, NH 03755-1404, USA. Electronic address: monic.roengvoraphoj@hitchcock.org.
• Cancer treatment reviews.Cancer Treat Rev.2013 Dec;39(8):839-50. doi: 10.1016/j.ctrv.2013.05.001. Epub 2013 Jun 12.
• Activation of the epidermal growth factor receptor (EGFR) pathway has been implicated in tumorigenesis in non-small cell lung cancer (NSCLC), the most common type of lung cancer. As a result, EGFR has become a key focus for the development of personalized therapy, with several molecular biomarkers h
• PMID 23768755

Japanese Journal

• 内科医からみた先制医療 : 肺癌 (第112回(2015年) 日本内科学会講演会 イノベーションで拓く内科学) -- (パネルディスカッション 内科医からみた先制医療)

• 萩原 弘一
• 日本内科学会雑誌 104(9), 1808-1811, 2015-09-10
• NAID 40020595320

• 症例 小細胞肺癌・間質性肺炎の治療中に播種性水痘を発症し死亡した1例

• 大前 美奈子,横村 光司,阿部 岳文 [他]
• 日本呼吸器学会誌 = Annals of
• NAID 40020592935

• 気腫合併肺線維症に併発した肺癌に対して外科的治療を行った27例の臨床的検討

• 溝上 裕子,増永 愛子,小嶋 圭介 [他]
• 日本呼吸器学会誌 = Annals of
• NAID 40020592735

Related Links

• Lung Cancer Home Page - National Cancer Institute

Information about lung cancer treatment, prevention, causes, screening, clinical trials, research, statistics and other topics from the National Cancer Institute. ... Definition of lung cancer: Cancer that forms in tissues of the lung ...

• Lung Cancer: Integrative Treatment Program | CTCA

Explore your lung cancer treatment options. Using innovative medical technology and supportive care, like nutrition therapy, at CTCA we fight lung cancer with l treatments that help patients experience a better quality of life.

Related Pictures

---

★リンクテーブル★

リンク元	「pulmonary cancer」「lung neoplasm」「pulmonary neoplasm」「肺がん」
関連記事	「thing」「cancer」

「pulmonary cancer」

　　[★]

肺癌、肺がん

関

cancer of the lung、carcinoma of lung、lung cancer、lung carcinoma、lung neoplasm、pulmonary carcinoma、pulmonary neoplasm

「lung neoplasm」

　　[★]

肺腫瘍、肺新生物

関

cancer of the lung、lung cancer、lung tumor、pulmonary cancer、pulmonary neoplasm、pulmonary tumor

「pulmonary neoplasm」

　　[★]

肺腫瘍、肺新生物

関

cancer of the lung、lung cancer、lung neoplasm、lung tumor、pulmonary cancer、pulmonary tumor

「肺がん」

　　[★]

英

lung cancer、lung carcinoma、cancer of the lung、pulmonary carcinoma、pulmonary cancer

関

肺癌、肺腫瘍

「thing」

　　[★] 　 　 　 　 　 　 　 　 　 　 　 　

「cancer」

　　[★]

同

癌腫

関

tumor