To observe the effect of degradation-resistant p27Kip1 on Myc-induced tumorigenesis, tumor-free survival in LMP2A/λ-MYC, LMP2A/λ-MYC/p27Super, λ-MYC, and λ-MYC/p27Super mice was examined (Fig. 1). The gene discussed is CDKN1B; the disease is neoplasm.