DHX9 and thymoma: Since the TCGA database could not provide the normal tissues of some tumors for comparison, we extracted expression data from GTEx and found that DHX9 was highly expressed in DLBC (lymphoid neoplasm diffuse large B-cell lymphoma), LGG (brain lower grade glioma), THYM (thymoma) compared with normal tissues (Figure 1B), whereas no significant differences were found from normal tissue and tumor tissues in other tumors (Supplementary Figure S2A).