TPO and type 1 diabetes mellitus: An interesting study found that the prevalence of chronic thyroiditis or seropositivity for TPO antibodies was higher among 16 patients with T1D that were seropositive for AGA compared to 37 AGA-seronegative T1D patients (38% vs. 2.7%, p = 0.005 for chronic thyroiditis and 69% vs. 27%, p = 0.01 for TPO seropositivity) [181].