Breast cancer is the second leading cause of death of women due to cancer. It occurs when breast cells reproduce and divide very quickly and disorderly. The causes of breast cancer may be associated with interaction of genetic factors to lifestyle, environment and reproductive habits. There are certain risk factors that increase the chances that a woman will have a breast cancer, such as inheritance.
When is an exam that is detected breast cancer, this test also shows the extent or stage of cancer, ie, it is possible to know the size of the cancer and whether it has spread from its original location. After the diagnosis, doctors may decide the most appropriate treatment.
In general, there are four stages of development of breast cancer, from the first stage, in which the tumor is still small and localized to the stage 4, in which the tumor has spread to other parts of the body. When the tumor had spread to distant body sites, it is said that it is a secondary or metastatic cancer.
The estadimento breast cancer is based on the classification of malignant tumors, TMN (Tumor-Node-Metastasis). This classification was proposed by the International Union Against Cancer, according to the characteristics of the primary tumor, lymph node chains lymphatic drainage of the body in which the tumor is located and the presence or absence of distant metastases.
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