STAT1 and hyperinsulinemic hypoglycemia, familial, 4: When considering disease involvement of both AD STAT1 deficiency and AR STAT1 deficiency together, however, a recent study found that among 64 patients with AR or AD STAT1 deficiency, the most common sites were disseminated disease for 44.4%, followed by cutaneous disease for 41.3% and then bone disease for 39.7% (24).