RB1 and small cell lung carcinoma: Consistent with this, no Cyclin D1 expression was detected in Rb-inactivated SCLC cell lines (Lu139SCLC-A, H2107SCLC-A, H82SCLC-N, H526SCLC-P, and HCC33SCLC-ATOH1), with the exception of H524SCLC-N (Supplementary Fig. 3h).