Conversely, Beysel et al. [19] found higher insulin resistance, increased insulin levels, and HOMA-IR values in the former than in the latter, without any differences between NC-PHPT and HC-PHPT; in addition, in the study by Ozturk et al. [20], NC-PHPT had higher glucose levels than controls despite similar insulin, HOMA-IR, and HbA1c values. This evidence concerns the gene INS and Insulin resistance.