In our study, we also tried to answer the question of whether the expression of GR in the tumour tissue correlates with the GR content in the serum of patients The study showed that a higher serum level of GR characterizes patients with a high expression of GR in the colon adenocarcinoma samples (M = 54.26 versus M = 38.89 ng/mL) (p = 0.032). The gene discussed is GSR; the disease is neoplasm.