Patients With Stage III-IVa Nasopharyngeal Carcinoma With or Without a Mobile Medical Platform Full-course Nutritional Intervention

Inclusion Criteria: * 1.Voluntarily participate and sign the informed consent in writing. * 2.Stage III-IVa (AJCC 8th edition staging) . * 3.Received induction chemotherapy + concurrent chemoradiotherapy . * 4.18-70 years old. * 5.Pathologically diagnosed with non-keratinizing nasopharyngeal carcinoma (differentiated or undifferentiated, that is, WHO type II or III). * 6.No previous anti-tumor therapy . * 7.ECOG score 0-1. * 8.Ensure contraception during the study period. * 9.Hemoglobin (HGB) ≥90 g/L, white blood cell (WBC) ≥4×109/L, platelet (PLT) ≥100×109/L. * 10\. Liver function: ALT, AST \< 2.5 times the upper limit of normal (ULN), total bilirubin \< 2.0 × ULN. * 11\. Renal function: serum creatinine \<1.5×ULN. * 12.Able and willing to use a mobile phone or tablet to fill in the electronic scale. Exclusion Criteria: * 1.Received antitumor therapy in the past. * 2\. The pathology was keratinizing squamous cell carcinoma (WHO type I). * 3.Pregnant women who are in the reproductive period and have not taken effective contraceptive measures. * 4\. Has suffered from other malignant tumors (except for cured basal cell carcinoma or carcinoma in situ of the cervix). * 5.Patients with significantly low heart, liver, lung, kidney and bone marrow functions. * 6.Serious, uncontrolled medical diseases and infections. * 7.Concurrent use of other experimental drugs or other clinical trials. * 8\. Refused or unable to sign the informed consent to participate in the trial. * 9.Those who have other contraindications to treatment. * 10.Persons with personality or mental disorders, no capacity for civil conduct or limited capacity for civil conduct.