A Study Comparing Hypofractionated Dose Escalated VMAT to Conventional CCRT in Locally Advanced Head and Neck Cancer

Inclusion Criteria: 1. Age ≥18 years and ≤70 years old. 2. Histopathologically confirmed squamous cell carcinoma of head and neck. 3. Locally advanced tumors (T3-T4 \&/or N1-3) (stage IIB, III and stage IV-A: Staging by AJCC 7th edition). 4. Patients not exposed to radical surgery for current disease. 5. Performance status (ECOG) 2 or less. 6. No associated co-morbidity with contraindication to chemotherapy. 7. Normal Hemogram. (ANC ≥1.5x109/L, Platelets count ≥100x109/L, hemoglobin ≥80 g/L) 8. Accepted renal functions. (BUN \& serum creatinine \<1.5x upper limit of normal value with normal GFR). 9. Accepted liver functions. (total bilirubin and direct bilirubin \< 1.5 x ULN \& alanine aminotransferase and aspartate aminotransferase \< 3 x ULN) 10. Informed consent. Exclusion Criteria: 1. Patients with distant metastatic lesions, as detected by imaging techniques. 2. Patients with history of other head and neck malignancies. 3. Patients with history of previous head and neck irradiation. 4. Patients with a serious concomitant illness, such as active cardiac disease, severe uncontrolled hypertension, or uncontrolled infection. 5. Women who are pregnant or breast feeding.