GPR183 and neoplasm: Furthermore, mining published proteogenomic datasets for healthy tissues (37) and tumor tissues (35, 36) from indications with appreciable immune cell involvement (45, 46) revealed significant and consistent correlations between protein (or phosphopeptide) levels and RNA levels for both MX2 and GPR183 (Figures 3A,B), suggesting that protein-based assessment of the MX2/GPR183 may be feasible.