ARG2 and neoplasm: In tumor tissue, both ARGs were correlated positively with both DDAHs, while in adjacent tissue, ARG1 was correlated solely with DDAH1. In tumors, NOS2 correlated with both PRMTs, while in adjacent tissue, only with PRMT1 and additionally with ODC1. In tumors, ODC1 correlated with both ARGs, DDAH2, and PRMT5, while in adjacent tissue, solely with ARG2 isoenzyme, with DDAH2, NOS2, and both PRMTs.