IFNG and gastric cancer: Concerning the linkage between cytokines and the HADS-D score, only IFN-γ (P = 0.049) (Figure 2D), but not IL-4 (P = 0.065) (Figure 2E) or IL-17A (P = 0.058) (Figure 2F), was positively linked to the HADS-D score in elderly gastric cancer patients.