GCLC and diabetes mellitus: GCLC C/T+T/T genotypes were also associated with a significantly lower age at diabetes diagnosis (11 years old) in comparison to the C/C genotype (13 years old) (p = 0.0073) and with a higher frequency of use of angiotensin converting enzyme inhibitors (31.4% versus 18.8%, respectively; p = 0.0164).