TGM2 and dermatitis herpetiformis, familial: Regarding values of both anti-tTG and anti-npG IgA, differences between healthy control and DH patients (P < 0.001) were significant as well as between IgA/neutrophil-mediated non-DH dermatoses and DH patients (P < 0.001), whereas differences between healthy control and IgA/neutrophil-mediated non-DH dermatoses were not revealed (P > 0.05).