Only 2 out of 37 patients (5.4%) underwent genetic testing and were excluded for XLP2, CARM1L2 protein deficiency, mevalonate kinase deficiency, IL-10 receptor deficiency, activated PI3Kδ syndrome, STAT1 gene defects, and SKIV2L syndrome. Here, STAT1 is linked to hyperinsulinemic hypoglycemia, familial, 4.