CHAC1 and nonpapillary renal cell carcinoma: Mechanistically, CHAC1 intersects critical pathways by regulating redox homeostasis through glutathione catabolism, mediating potential crosstalk with androgen receptor signaling, and serving as an independent prognostic determinant in ccRCC (FPTOS_score model: HR = 2.028, 95% CI: 1.640-2.507).