When analyzing only for the subgroup of patients with gigantism only three publications reported IGF1 with a mean of 1328.3 (μg/L) and IGF1 index of 3.0, seven publications reported GH with a mean of 17.8 (μg/L), and three publications reported tumor size with a mean of 8 mm, range 4–12 mm. Here, GH1 is linked to neoplasm.