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PET CT is permitted if CT is of diagnostic quality.\n* Eastern Cooperative Oncology Group (ECOG) Performance Status 0-3\n* Participants of childbearing potential must have agreed to use a highly effective contraceptive method during protocol therapy.\n* Patients with a prior malignancy whose natural history or treatment does not have the potential to interfere with the safety or efficacy assessment of the investigational treatment are eligible for this trial.\n\nExclusion Criteria:\n\n* Patients with nasopharyngeal carcinoma.\n* Prior systemic therapy (including immunotherapy).\n* Prior radiotherapy to the head and neck excluding superficial radiotherapy for head and neck skin cancer that does not overlap with current protocol treatment.\n* Prior head and neck cancer excluding skin cancer.\n* Patients with tumour locations\u002Fat risk of SBRT toxicity, including glottic\u002Fsubglottic larynx, T4 hypopharynx, post-cricoid, cervical esophagus, circumferential pharyngeal involvement, extension\u002Fproximity to brain\u002Foptic structures, any single tumour mass \\>8 cm (in one dimension).\n* \\> 2 nodal levels (Level 1a\u002Fb not counted); retropharyngeal lymph nodes (where the closest edge is \\\u003C 2cm from the closest edge of CTV (primary or nodal) will not be considered as a different level). Note: a single lymph node mass that spans 2 levels will be considered as 1 level.\n* Gross tumour poorly visualized on CT\u002FMRI.\n* Definitive radiological or clinically evident distant metastases.\n* Scleroderma\u002FCREST syndrome.","ALL","18 Years",{"count":165,"type":166},196,"ESTIMATED","INTERVENTIONAL",[169],"PHASE3","This study is being done to answer the following question: Does stereotactic body radiation therapy (SBRT) provide better cancer control compared to standard radiation therapy (RT) for those with advanced head and neck cancer?",[172],"Advanced Head and Neck Cancer","2026-06-08",{"date":175,"type":176},"2026-06-09","ACTUAL",{"date":178,"type":176},"2025-04-07",{"date":180,"type":166},"2031-06-01",{"name":5,"class":6},8]