ACE2 and neoplasm: Here, we analyzed the effect of VPA on ACE2 expression in human cell lines of different origins (lung, kidney, primary endothelium, for BEAS-2B, HK-2, and HUVEC cells, respectively) and in two tumor-derived cell lines (hepatocarcinoma and colorectal carcinoma, for Huh-7 and Caco-2 cells, respectively).