PPM1D and cancer: The STC1 gene may be the downstream target of several genes and proteins related to cancers (Figure 1), including p53,62 BRCA1,53 RET,63 Wnt2,64 JMJD3,65 PPM1D,66 PKCα,67 PPARD,68 LINE‐1,69 IGF‐170 and CAIX.57