There are 5 stages of breast cancer; The earliest stage of breast cancer is called carcinoma in situ..
In Stage I breast cancer the cancer cells spread past the initial site to surrounding areas
In Stage II breast cancer also known as invasive breast cancer, cancer spreads to the lymph nodes.
In Stage III breast cancer, cancer spreads to axillary lymph nodes.
Stage IV breast cancer is also known as metastatic breast cancer. During this stage, cancer spreads to even distant parts of the body.