Grading and staging follow the TNM classification (see Table 2: Breast Disorders: Staging and Survival of Breast Cancer). Staging is refined during surgery, when regional lymph nodes can be evaluated.

• 肿瘤淋巴结转移分类后的分组与分期（见表2：乳房疾病：乳腺癌的分期与存活）。肿瘤分期在手术期间进行，此时可对局部淋巴结作评估。