Furthermore, simultaneous inactivation of one Pten allele and one or more Cdkn1b (encoding p27Kip1) alleles accelerated neoplastic transformation and increased tumor incidence in a mouse prostate cancer model [102], implying that p27Kip1 plays a crucial role in mediating the tumor-suppressive effect of PTEN. The gene discussed is CDKN1B; the disease is neoplasm.