RNF20 and small cell lung carcinoma: Lower levels of RNF20 were observed in A549, A427 and H322 adenocarcinoma as well as human H82 and H69 small-cell lung cancer cells compared to normal human bronchial epithelium (BEAS-2B) cells (Fig. 2a) and in mouse Lewis lung carcinoma (LLC1) cells compared to mouse lung epithelial (MLE12) cells (Fig. 2b).