Here, only older donors (mean 48 years) with a single GADA- or IAA-AAb were analyzed, who had not progressed to classical T1D or late onset autoimmune diabetes in adults, their pancreases had many large islets and very few lymphocytes in islets (mean of 0.1 CD45+cell/islet) and normal C-peptide levels (mean = 4.3 nmol/L). Here, PTPRC is linked to type 1 diabetes mellitus.