PPIA and nasopharyngeal carcinoma: As shown in Figure 3A, B, the ROC curves discriminated between NC and NPC, with the area under the ROC curve (AUCs) being of 0.631 (CYPA detected from whole sera; 95% CI: 0.547‐0.709; P = 0.042; The cutoff value of human sera: 0.248) and 0.844 (CYPA from serum exosomes; 95% CI: 0.775‐0.899; P < 0.0001; The cutoff value of serum exosomes: 0.7434), respectively.