出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2015/06/05 09:50:49」(JST)
Male breast cancer | |
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The pink and blue ribbon is used for awareness of male breast cancer.
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Classification and external resources | |
Specialty | Oncology |
ICD-10 | C50 |
ICD-9 | 175,175.0,175.9, |
OMIM | 114480 |
MedlinePlus | 000913 |
eMedicine | radio/115 |
MeSH | D001943 |
Male breast cancer (male breast neoplasm) is a rare cancer in men that originates from the breast. Many men with breast cancer have inherited a BRCA mutation, but there are other causes, including alcohol abuse and exposure to certain hormones and ionizing radiation.
As it presents a similar pathology as female breast cancer, assessment and treatment relies on experiences and guidelines that have been developed in female patients.[1][2][3] The optimal treatment is currently not known.[4]
About one percent of breast cancer develops in males.[4] It is estimated that about 2,140 new cases are diagnosed annually in the United States (US) and about 300 in the United Kingdom (UK). The number of annual deaths in the US is about 450.[2][3] In a study from India, eight out of 1,200 (0.7%) male cancer diagnoses in a pathology review represented breast cancer.[5] Incidences of male breast cancer have been increasing which raise the probability of other family members developing the disease. The relative risk of breast cancer for a female with an affected brother is approximately 30% higher than for a female with an affected sister.[6][7][8] The tumor can occur over a wide age range, but typically appears in men in their sixties and seventies.
Known risk factors include radiation exposure, exposure to female hormones (estrogen), and genetic factors. High estrogen exposure may occur by medications, obesity, or liver disease, and genetic links include a high prevalence of female breast cancer in close relatives.[3] Chronic alcoholism has been linked to male breast cancer.[9] The highest risk for male breast cancer is carried by men with Klinefelter syndrome.[7] Male BRCA mutation carriers are thought to be at higher risk for breast cancer as well, with roughly 10% of male breast cancer cases carrying BRCA2 mutations, and BRCA1 mutation being in the minority.[10][11]
As in females, infiltrating ductal carcinoma is the most common type. While intraductal cancer, inflammatory carcinoma, and Paget's disease of the nipple have been described, lobular carcinoma in situ has not been seen in men.[1] Breast cancer in men spreads via lymphatics and blood stream like female breast cancer. Accordingly, the TNM staging system for breast cancer is the same for men and women.[1]
Size of the lesion and lymph node involvement determine prognosis; thus small lesions without lymph node involvement have the best prognosis. Estrogen receptor and progesterone receptor status and HER2/neu (Human Epidermal Growth Factor Receptor 2) gene amplification need to be reported as they may affect treatment options. About 85% of all male breast cancers are estrogen receptor–positive, and 70% are progesterone receptor–positive.[1]
Typically self-examination leads to the detection of a lump in the breast which requires further investigation. Other less common symptoms include nipple discharge, nipple retraction. swelling of the breast, or a skin lesion such as an ulcer. Ultrasound and mammography may be used for its further definition. The lump can be examined either by a needle biopsy where a thin needle is placed into the lump to extract some tissue or by an excisional biopsy where under local anesthesia a small skin cut is made and the lump is removed. Not all palpable lesions in the male breast are cancerous, for instance a biopsy may reveal a benign fibroadenoma. In a larger study from Finland the average size of a male breast cancer lesion was 1.8 cm.[9] Beside the histologic examination estrogen and progesterone receptor studies are performed. Further, the HER2 test is used to check for a growth factor protein. Its activity can be increased in active cancer cells and helps determine if monoclonal antibody therapy (i.e. Trastuzumab) may be useful.[3]
Male breast cancer can recur locally after therapy, or can become metastatic.
In addition to TNM staging surgical staging for breast cancer is used; it is the same as in female breast cancer and facilitates treatment and analysis.[12]
Stage I is an invasive breast cancer with the tumor not exceeding 2 cm and absence of lymph node involvement.
Stage II includes stages IIA and IIB.
One of the following three items applies:
Either of the following applies:
Stage III is divided into three subcategories:
Stage IV is applied to metastatic breast cancer; typically lungs, liver, bone, or brain are involved.
There are significant differences between male and female breast cancer. Lesions are easier to find in men due to the smaller breast size; however, lack of awareness may postpone seeking medical attention. The presence of gynecomastia may mask the condition. The diagnosis is made later in men—at age 67 on average—than in women with their average at 63.[6] Lesions are less contained in men as they do not have to travel far to infiltrate skin, nipple, or muscle tissue.[3] Thus, lesions in men tend to be more advanced.[9] Almost half of male breast cancer patients are stage III or IV.[7] In familial cases, male BRCA2 carriers are at higher risk, rather than BRCA1 carriers.[7] With the relative infrequency of male breast cancer, randomized studies are lacking.[7]
Treatment largely follows patterns that have been set for the management of postmenopausal breast cancer.[9] The initial treatment is surgical and consists of a modified radical mastectomy with axillary dissection or lumpectomy and radiation therapy with similar treatment results as in women.[3] Also, mastectomy with sentinel lymph node biopsy is a treatment option.[7] In men with node-negative tumors, adjuvant therapy is applied under the same considerations as in women with node-negative breast cancer. Similarly, with node-positive tumors, men increase survival using the same adjuvants as affected women, namely both chemotherapy plus tamoxifen and other hormonal therapy.[3] There are no controlled studies in men comparing adjuvant options. In the vast majority of men with breast cancer hormone receptor studies are positive, and those situations are typically treated with hormonal therapy.
Locally recurrent disease is treated with surgical excision or radiation therapy combined with chemotherapy.[1] Distant metastases are treated with hormonal therapy, chemotherapy, or a combination of both. Bones can be affected either by metastasis or weakened from hormonal therapy; bisphosphonates and calcitonin may be used to counterbalance this process and strengthen bones.
Chemotherapeutic options include:
Hormonal options include:
Adjusted for age and stage the prognosis for breast cancer in men is similar to that in women.[7] Prognostically favorable are smaller tumor size and absence or paucity of local lymph node involvement.[13] Hormonal treatment may be associated with hot flashes and impotence.
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リンク元 | 「male breast neoplasm」「男性乳癌」「男性乳がん」 |
関連記事 | 「male」「breast」「cancer」「males」 |
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