In the multiple regression analyses, BMI (β = -0.210, P = 0.007), free thyroxine (β = 0.440, P < 0.001), and tumor height (β = -0.254, P < 0.001) were significant variables for determining the logarithm of the peak GH response to GHRP-2 (Table 2). This evidence concerns the gene GH1 and neoplasm.