PLAGL1 and breast cancer: Correspondingly, the reduction or loss of Zac1 expression is associated with the incidence and progression of several human tumors, including cervical cancer, breast cancer, ovarian cancer, pituitary tumors, and basal cell carcinoma4,8,12, implying the rationality of utilizing Zac1 expression as novel a biomarker for the evaluation of cervical cancer prognosis.