GLP1R and medullary thyroid gland carcinoma: In their study, GLP-1 receptor expression was found in 3 out of 17 papillary thyroid carcinoma cases, which should direct further research not only toward the rare medullary thyroid carcinoma but also the most common type of thyroid cancer, papillary thyroid carcinoma, constituting 90% of all thyroid cancers [91].