Baek et al. (12) showed that posttransplant tumor models—Lewis lung carcinoma and B16F10 melanoma cells in Ts65n and transgenic Rcan1 mice—exhibited inhibited tumor growth compared with wild-type mice; however, the reduction of tumor growth was more pronounced in Ts65n mice than in transgenic Rcan1 mice. The gene discussed is RCAN1; the disease is melanoma.