乳腺癌的“两类”是根据癌瘤的病理形态将乳腺癌分成“分化程度低”和“分化程度高”的两类；“四期”是按乳腺癌临床病情程度不同，将乳腺癌划分为四期。“两类”、“四期”都是医生拟定治疗方案、判断预后的依据。1病理学的两类乳腺癌乳腺癌的病理学分类至今尚未统一。就分化 The “two types” of breast cancer are based on the pathological morphology of cancers and classify breast cancer into two categories: “low differentiation” and “high differentiation”; “four phases” divide breast cancer according to the degree of clinical disease of breast cancer. For four issues. “Two types” and “four periods” are the basis for doctors to formulate treatment plans and judge their prognosis. 1 Pathology Two categories of breast cancer The pathological classification of breast cancer has not yet been unified. Differentiation