MAOA and neoplasm: For instance, human T cells have been indicated to express MAOA (https://www.proteinatlas.org/ENSG00000189221-MAOA/blood); and in our syngeneic mouse tumor model studies using the Maoa KO mice, we have detected enhanced antitumor T-cell responses—an effect that may result from a combination of MAO-A’s direct regulation of T cells and indirect regulation of T-cell response via modulating TAMs.