Inclusion Criteria:  Locally advanced non-metastatic carcinoma of the oropharynx limited to T3 and T4 (whatever the N) and N2-N3 (whatever the T)(AJCC stage III-IV) Age ≥ 18 years and ≤ 75 years Performance status (WHO ≤ 2) Renal, hepatic and cardiovascular functions allowing systemic treatment administration Adapted stomatologic care Signed informed consent form Membership or beneficiary of a national insurance scheme  Exclusion Criteria:  Both parotids totally included in the target volume Stages T1 or T2 with positive node disease N1 Neoadjuvant chemotherapy Exereses of primitive tumor and/or nodes History of other cancer within 5 years (except for basocellular epithelioma and cervical) Previous neck radiotherapy Platinum salts, 5FluoroUracile (5FU) agents or cetuximab chemotherapy Unstable diseases (cardiovascular, renal, pulmonary, systemic lupus or sclerodermia) incompatible with study participation Patient participating in other therapeutic trial with experimental drug, 30 days before the inclusion. Patient already recruited in another biomedical research ( non interventional study is authorized) Pregnant or breast feeding patients Patient deprived of liberty, under tutorship, guardianship or placed under judicial protection Patient is deemed incapable of giving informed consent Patients who, for family, social, geographic or psychological reasons, cannot be adequately followed up and/or are incapable of undergoing regular controls.