Table 2 The inclusion criteria and exclusion criteria for the patients with NPC
Inclusion criteria | Exclusion criteria |
|---|---|
Biopsy-proven, WHO II or III NPC | WHO I NPC or other pathological types |
Patients first diagnosed in Sun Yat-Sen University Cancer Center | Patients first diagnosed in another hospital |
Patients without any treatment, including radiotherapy, chemotherapy, and surgery | Patients treated by radiotherapy, chemotherapy, and surgery |
No second primary tumors | Patients with other tumours |