IGF1 and neoplasm: The correlation with GH excess was 0.368 (p = 0.006; Spearman`s r) for IGF-1 and 0.661 (p < 0.001) for sKl, and with estimated tumor volume 0.276 (p = 0.041) for IGF-1 and 0.527 (p < 0.001) for sKl.