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.