Copy number analysis of TCGA tumor samples in cBioportal database showed that both USP13 and MCL1 were genomically amplified in a wide range of cancer types (Fig. 2a), in particular a considerable proportion of lung adenocarcinoma, lung squamous cell carcinoma and ovarian serous carcinoma cases (Fig. 2b). This evidence concerns the gene MCL1 and squamous cell lung carcinoma.