Thus, this study aimed to determine the relationship between the molecular markers of telomerase complex (TERC rs12696304, rs35073794, TEP1 rs1713418, rs1760904, and TERT rs2736098, rs401681) and the relative leukocyte telomeres length with the development of pituitary adenoma. The gene discussed is TERC; the disease is pituitary gland adenoma.