MKI67 and breast cancer: A 49-year-old woman was diagnosed with bilateral breast cancer (Rt: cT2cN0M0 cstageIIA, Lt: cT2cN1M0 cstageIIB) and its intrinsic type was non-luminal type (Estrogen & Progesterone receptor positive, human epidermal growth factor receptor 2 (HER2) 3+, ki67 31 %) in the right side and lumina A-like (Estrogen & Progesterone & HER2 negative, ki67 < 5 %) in the left side.