IGF1 and hyperinsulinemic hypoglycemia, familial, 4: Furthermore, children with IGF-1 deficiency-primary GH insensitivity or children with Laron syndrome who were treated with biosynthetic IGF-1 (165) showed increases in their serum alkaline phosphatase and serum procollagen and IGF-binding protein-3 (IGFBP-3) (165–167).