P2RX4 and neoplasm: Multivariable Cox-regression showed a significantly increased risk of progression in tumors with a low P2X4 expression in the tumor cells (HR: 1.95; 95% CI: [1.04, 3.65], p = 0.039) and a positive prognostic impact in tumors with low expression in surrounding stroma cells (HR: 0.39; 95% CI: [0.20, 0.75], p = 0.004).