PIK3CG and ovarian cancer: Previous studies recommend that PIK3CG exhibits significant DNA copy number gains in ovarian cancer, compared to normal ovary in humans [42], PIK3C1 promotes the activation of primordial follicles [43], and moreover, in PDK1 depletion in oocytes depletes the majority of primordial follicles around the onset of sexual maturity and causes premature ovarian failure in mice [44].