PLAC1 and breast carcinoma: qRT‐PCR and western blotting revealed different expression levels of Plac1 in breast cancer cells (MCF‐7, MDA‐MB‐231, BT‐474, MDA‐MB‐453, MDA‐MB‐468, HCC‐1937, SKBR3, and T47D; Fig. S1A,B).