As the number of patients with AS vs. AI was significantly higher in diabetic patient groups, we did asses GLP-1 plasma levels in AS vs. AI; however, our results demonstrate a trend toward increased levels of fasting plasma GLP-1 in AI vs. AS patients, although no significant difference could be observed (AS plasma FGLP-1; 34.8 ± 3.3, and AI FGLP-1; 49.9 ± 8.9). This evidence concerns the gene GCG and aortic stenosis.