PP2Cδ or WIP1 (Wild-type p53 induced protein phosphatase 1), encoded by PPM1D, is a well-studied phosphatase, implicated in several processes, such as cell cycle regulation, metabolism, immune cell development and immune response, spermatogenesis, autophagy, and in cancer, it was established as an oncogene (Emelyanov and Bulavin, 2015; Kamada et al., 2020). The gene discussed is PPM1D; the disease is cancer.