Autoantibody testing against two other autoantigens, KCNRG and BPIFB1, found in autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy (APECED) patients with autoimmune pneumonia, revealed no seropositivity in any of the SjD or IIM subjects (data not shown). This evidence concerns the gene KCNRG and autoimmune polyendocrine syndrome type 1.