MOR has been associated with several protumorigenic properties: the co‐activation of EGFR, the promoting of epithelial mesenchymal transition (EMT) which gives tumor cells their migrative and invasive properties, and the activation of various other tumor‐promoting pathways outside of EGFR [20, 26, 27, 28, 29, 30, 31]. Here, OPRM1 is linked to neoplasm.