H-Scores were 223.1 ± 34.7 for PTTG1 and 163.4 ± 42.3 for SYT1 in 62 somatotroph adenomas specimens and 84.2 ± 21.3 for PTTG1 and 47.4 ± 17.2 for SYT1 in 10 healthy pituitary specimens by IHC. This evidence concerns the gene SYT1 and growth hormone-secreting pituitary adenoma.