Type B breast cancer, also known as breast cancer, is a malignant tumor that can occur in either men or women, but is generally more common in women. Breast cancer is classified into four types: Luminal A, Luminal B, HER-2, and triple negative. If HER-2 is negative, the index of Ki67 is generally higher, and it may be possible to apply targeted drug therapy, but generally, type B breast cancer can be treated with endocrine therapy.