Among these three homologous genes, PTTG1 has undergone extensive investigation and has been established as closely linked to the onset and progression of various human cancer types, including pituitary tumors [48], gliomas [16], breast [4, 49], thyroid [50], bladder [17, 51], ovarian [9], and prostate cancers [18]. Here, PTTG1 is linked to pituitary tumor.