FIS1 and breast cancer: Finally, western blotting was employed to detect the expression of apoptosis‐related protein caspase‐3, cleaved‐caspase‐3, Bcl‐2, Bak, DRP1, and FIS1 to explore the effect of FLT on apoptosis in human breast cancer cells MCF‐7 and MBA‐MB‐231 along with the mechanism.