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Breast cancer is a condition in which certain cells in the breast become abnormal and multiply uncontrollably to form a tumor. Although breast cancer is becoming more common in women, this disorder can also occur in men. The most common type of breast cancer in both women and men comes from cells lining the milk ducts. Since lobular tissue is scarce in most men, lobular cancer in men is very uncommon. Breast cancer typically does not cause pain and may have no apparent signs in its early stages, although it may have no apparent signs. Just because a person has one or two of these signs does not mean they have breast cancer. If breast cancer is widespread, cancerous cells most often appear in the bones, liver, lungs, or brain. Hereditary breast cancers tend to develop earlier in life than noninherited cases, and new tumors are more likely to develop in both breasts.
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