FGF21 and neoplasm: Checking the diagnostic possibilities of leptin and FGF21 in case of differentiation between high (FIGO III and IV) and low (FIGO I and II) stages of clinical advancement of the tumor and forecasting the degree of histopathological differentiation of the tumor (G1 vs. G3) based on the AUC curve was as follows: 0.79/0.78 and 0.80/0.82 (see Figure 5 and Figure 6).