Toripalimab, Induction Chemotherapy, Radiation Therapy With Omega-3 for Locally Advanced Nasopharyngeal Carcinoma

Inclusion Criteria: * Written informed consent can be provided, and understanding and compliance with research requirements and evaluation schedules are required. * On the date of signing the informed consent form, the age range is between 18 and 65 years old (or the legal age specified by local laws). * Pathological diagnosis is non keratinizing carcinoma of the nasopharynx (differentiated or undifferentiated, i.e. WHO classification II or III). * Clinical staging is anyTN2-3M0 or T4N1M0 (AJCC8th/UICC staging). * ECOG score is 0-1 points. * Hemoglobin (HGB) ≥ 90g/L, white blood cell (WBC) ≥ 4.0 × 109/L, platelet (PLT) ≥ 100 × 109/L. * Liver function: ALT and AST\<2.5 times the upper limit of normal (ULN), total bilirubin\<2.0 × UL, serum albumin ≥ 28g/L. * Renal function: Serum creatinine\<1.5 × ULN or creatinine clearance rate (CrCl) calculated value ≥ 60mL/min (Cockcroft Gault formula). * Thyroid stimulating hormone (TSH) ≤ 1 × ULN (if abnormal, FT3 and FT4 levels should be examined simultaneously. If FT3 and FT4 levels are normal, they can be included in the group). * The international normalized ratio (INR) and activated partial thromboplastin time (APTT) are ≤ 1.5 × ULN (unless the subject is receiving anticoagulant treatment and the coagulation parameters (PT/INR and APTT) are within the expected range of anticoagulant treatment at the time of screening). Exclusion Criteria: * Nasopharyngeal cancer patients with recurrence and distant metastasis. * Pathology shows keratinized squamous cell carcinoma (WHO classification type I). * Patients who have undergone radiotherapy or systemic chemotherapy before. * Pregnant or lactating women who are in the reproductive period and have not taken effective contraceptive measures. * HIV positive. * Have suffered from other malignant tumors (except for cured basal cell carcinoma or cervical carcinoma in situ). * Patients who have been treated with immune checkpoint inhibitors (CTLA-4, PD-1, PD-L1, etc.). * Patients with immunodeficiency diseases and a history of organ transplantation. * Patients who have been treated with high-dose corticosteroids, anti-cancer monoclonal antibodies, or other immunosuppressive agents within 4 weeks. * Patients with significantly impaired heart, liver, lung, kidney, and bone marrow function. * Simultaneously using other investigational drugs or in other clinical trials. * Refusal or inability to sign the informed consent form for participation in the trial. * Individuals with personality or mental disorders, without civil capacity or with limited civil capacity. * hepatitis B B surface antigen (HBsAg) is positive and the peripheral blood hepatitis B virus deoxyribonucleic acid (HBV DNA) is ≥ 1000 cps/ml. * Patients with positive HCV antibody test results are only eligible for this study if their HCV RNA polymerase chain reaction test results are negative. * Patients who have experienced any bleeding events with a severity rating of 3 or above in CTCAE5.0 within the first 4 weeks of screening and are deemed to have a high risk of bleeding by the researchers. * If there have been any arterial/venous thrombotic events within the 6 months prior to the start of screening, such as cerebrovascular accidents (including temporary ischemic attacks, cerebral hemorrhage, cerebral infarction), deep vein thrombosis, and pulmonary embolism. * Patients with hypertension who cannot be reduced to the normal range through antihypertensive medication (systolic blood pressure ≥ 140mmHg or diastolic blood pressure ≥ 90mmHg); Based on the average of BP readings obtained from ≥ 2 measurements, there has been a history of hypertensive crisis or hypertensive encephalopathy. * Past or current inflammatory bowel disease (such as Crohn's disease, ulcerative colitis, or chronic diarrhea); History of previous or existing gastrointestinal perforation and/or fistula. * Known history of active pulmonary tuberculosis (TB). Subjects suspected of having active TB should undergo chest X-ray, sputum examination, and exclusion based on clinical symptoms and signs. * Other serious, uncontrolled internal medical conditions and infections, or other contraindications to treatment, or any condition that researchers believe may pose a risk to receiving the study drug treatment, or interfere with the evaluation of the study drug, subject safety, or analysis of the study results.