GZMK and cancer: The results demonstrated that a poor prognosis in THCA was substantially correlated with reduced expression of GZMK, TREM2, and OR4D10 (p = 0.041, 0.024, and 0.017) (Figure 2A–C), suggesting that GZMK, TREM2, and OR4D10 are the potential oncogenes in this cancer.