Samples information.

aP = NPC patient; N = healthy donors.bHistological type: I = differentiated keratinizing squamous cell carcinoma (SCC); II = differentiated non-keratinizing carcinoma; III = undifferentiated carcinoma (UCNT).cTNM stage according to WHO UICC-AJCC 1997 standards (International Union Against Cancer/American Joint Committee on Cancer).dClinical stage: Stage I = T1N0M0; Stage II = T2N0-1M0; T0-1N1M0; Stage III = T3N0-2M0 or T0-3N2M0; Stage IVa = T4N0-3M0; T0-4N3M0 or Stage IVb = all T and all N plus M1.end = not done.