OLA1 and triple-negative breast carcinoma: To understand whether knocked down OLA1 in MDA-MB-231 can enhance the chemosensitivity of the triple negative breast cancer, Knocked down of OLA1 stably in MDA-MB-231 was performed (Figures 4A, B), and it was found that the expression of OLA1 was meaningfully decreased in the transfected group compared with the control group (**P < 0.01) (Figures 4C, D).