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Somehow, I am aware of of breast cancer. Here are some information to be shared...

WHAT IS BREAST CANCER?
Collections of cells that are growing abnormally or without control are called tumors. Tumors that do not have the ability to spread throughout the body may be referred to as “benign” and are not thought of as cancerous. Tumors that have the ability to grow into other tissues or spread to distant parts of the body are referred to as “malignant.” Malignant tumors within the breast are called “breast cancer”. Theoretically, any of the types of tissue in the breast can form a cancer, cancer cells are most likely to develop from either the ducts or the glands. These tumors may be referred to as “invasive ductal carcinoma” (cancer cells developing from ducts), or “invasive lobular carcinoma” (cancer cells developing from lobes).
Sometimes, precancerous cells may be found within breast tissue, and are referred to as ductal carcinoma in-situ (DCIS) or lobular carcinoma in-situ (LCIS). DCIS and LCIS are diseases in which cancerous cells are present within breast tissue, but are not able to spread or invade other tissues. DCIS represents about 20% of all breast cancers. Because DCIS cells may become capable of invading breast tissue, treatment for DCIS is usually recommended. In contrast, treatment is usually not needed for LCIS.

STAGES OF BREAST CANCER

Stage 0 (called carcinoma in situ)
Lobular carcinoma in situ (LCIS) refers to abnormal cells lining a gland in the breast. This is a risk factor for the future development of cancer, but this is not felt to represent a cancer itself.
Ductal carcinoma in situ (DCIS) refers to abnormal cells lining a duct. Women with DCIS have an increased risk of getting invasive breast cancer in that breast. Treatment options are similar to patients with Stage I breast cancers.
Stage I : early stage breast cancer where the tumor is less that 2 cm, and hasn't spread beyond the breast
Stage II : early stage breast cancer in which the tumor is either less than 2 cm across and has spread to the lymph nodes under the arm; or the tumor is between 2 and 5 cm (with or without spread to the lymph nodes under the arm); or the tumor is greater than 5 cm and hasn't spread outside the breast
Stage III : locally advanced breast cancer in which the tumor is greater than 5 cm across and has spread to the lymph nodes under the arm; or the cancer is extensive in the underarm lymph nodes; or the cancer has spread to lymph nodes near the breastbone or to other tissues near the breast
Stage IV : metastatic breast cancer in which the cancer has spread outside the breast to other organs in the body

It is at the 2nd stage.