GLP-1, glucagon-like peptide-1; DPP4, dipeptidyl peptidase-4; SGLT2, sodium glucose co-transporter 2; ACE, angiotensin-converting enzyme; ARB, angiotensin receptor blockers; SPIDDM, slowly progressive type 1 insulin-dependent diabetes mellitus; DM, diabetes mellitus. Here, DPP4 is linked to diabetes mellitus.