FCGR2A and type 2 diabetes mellitus: According to KEGG functional analysis, the FRGs were mainly enriched in renal cell carcinoma, lysosomes, FCγR-mediated phagocytosis, the phosphatidylinositol signaling system, proteasomes, maturity onset diabetes of the young, olfactory transduction, phenylalanine metabolism, proximal tubule bicarbonate reclamation, and the terpenoid backbone biosynthesis pathway.