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Breast cancer is staged from 0 to 4, with lower numbers indicating early-stage, localized cancer and higher numbers indicating more advanced cancer. Stage 0 is considered noninvasive or preinvasive, where abnormal cells haven't spread to healthy breast tissue.

Stage 1 breast cancer is divided into 1A and 1B. Stage 1A Show Full Answer

Breast cancer is staged from 0 to 4, with lower numbers indicating early-stage, localized cancer and higher numbers indicating more advanced cancer. Stage 0 is considered noninvasive or preinvasive, where abnormal cells haven't spread to healthy breast tissue.

Stage 1 breast cancer is divided into 1A and 1B. Stage 1A involves tumors up to 2 centimeters with no spread, while 1B can either have small cancer cell groups in lymph nodes or a small tumor with lymph node involvement. Stage 2 breast cancer is also considered early-stage but is more advanced. It's classified as either 2A or 2B, based on tumor size (greater than 20 millimeters), lymph node involvement, and other factors like hormone receptor status and tumor grade. The outlook for stage 2 breast cancer is generally positive, with an 86% five-year survival rate.

Doctors use various factors to determine the stage, including tumor size, lymph node involvement, hormone receptor status, HER2 status, and tumor grade. This staging helps guide treatment decisions and estimate prognosis.

 AI-generated responses are not a substitute for medical advice. These services are not intended to diagnose, treat, or cure any condition or disease. Always ask your doctor about specific health concerns.

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