FLT1 and breast cancer: Next, the results of the 3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyltetrazolium bromide (MTT) assay showed that FLT exhibited strong antiproliferative activity (p < 0.05) toward human breast cancer MCF‐7 and MDA‐MB‐231 cells.