SURF4 and breast carcinoma: Besides, significant high SURF4 expression (P < 0.01) was observed in MCF7 (Human luminal A type breast cancer cell), BT474 (Human luminal B type breast cancer cell), SKBR3 (Human HER2 overexpression type breast cancer cell), MDAMB231 and 4T1 (Human triple-negative breast cancer cell).