Newer methods have made it possible to find smaller and smaller collections of cancer cells, but experts haven't been sure how much these tiny deposits of cancer cells Stages of breast cnacer outlook. Your pathology report will include information that is used to calculate the stage of the breast cancer — that is, whether it is limited to one area in the breast, or it has spread to healthy tissues inside the breast or to other parts of the body. Stage 0 page in Planning Your Treatment. Chemotherapy is usually not part of the treatment regimen for earlier stages of cancer. So, a woman diagnosed with stage II disease that is triple-negative [estrogen-receptor-negative, progesterone-receptor-negative, and HER2-negative] will have a Stages of breast cnacer different treatment plan than a woman diagnosed with stage II disease that is estrogen-receptor-positive.