Association to type 1 diabetes and hypothyroidism was observed near RAB5B (12q13.2) and HORMAD2 (22q12.2), and association to inflammatory bowel disease near EMSY, with overlapping credible sets near SLC22A4 and IKZF3. The CDTA-associated locus near ABO colocalized with deep vein thrombosis, gastroduodenal ulcer, and type 2 diabetes. Here, RAB5B is linked to type 1 diabetes mellitus.