Breast Cancer Stages
The breast cancer stages are the number zero and the Roman numerals I, II, III, or IV (often followed by A, B, or C). In general, the higher the number, the more advanced the cancer. But there’s more to it than that.
Stage 0. The breast cancer has been diagnosed early. It started in the breast ducts or milk glands and has stayed there. You’re likely to
Stage I. Starting at this level, breast cancer stage 1 is called invasive, meaning it has broken free to attack healthy tissue.
Stage 1A means the cancer has spread into the fatty breast tissue. The tumor itself is no larger than a shelled peanut, or there may be no tumor