Measures included HbA1cCD, fold-anti-TTG IgA, anti-TTG IgA cutoff, and autoimmunity history of both groups, as well as Marsh grade in T1D-CD.<h4>Results</h4>In youths with T1D, HbA1cCD was associated with increased fold-anti-TTG IgA (Spearman r = 0.14, P = .0047). The gene discussed is CD79A; the disease is type 1 diabetes mellitus.