Pharmacokinetics and Pharmacogenetics-based Adaptive Dosing of 5-fu (5-Fluorouracile) in Head & Neck Cancer Patient Undergoing Docetaxel, Cisplatin, 5-Fluorouracile (=TPF) Therapy

Inclusion Criteria: * Age \> 18 and ≤ 80 years. * Squamous cell carcinoma of the head and neck (oral cavity, oropharynx, hypopharynx, larynx, nasopharynx). * Locally advanced stage (III, IVa or IVb). * The patient must have received the information note and signing the informed consent, as well as being spent in multidisciplinary meeting after which treatment with TPF (Docetaxel, Cisplatin, 5-Fluorouracile) induction chemotherapy was proposed. * Performance Status less than or equal to 2 (WHO performance index). * The patient must be affiliated to a social security scheme and followed in one of the participating centers. * Patients polymorphonuclear neutrophil greater than or equal to 1000 / mm3, platelets greater than or equal to 100 000 / mm3, hemoglobin greater than or equal to 8 g / dl, transaminases less than or equal to 1.5 times the normal, total bilirubin or equal 1.5 times the normal creatinine clearance in the upper or equal to 50 ml / min Modification of Diet in Renal Disease (MDRD) * Satisfactory heart function * Patients must be able to submit to the rhythm of visits, treatment plan, laboratory balances and other study procedures. Exclusion Criteria: * Patient \> 80 years. * Patients with uncontrolled infection that could compromise participation in the study. * Patients with other serious concomitant diseases and / or uncontrolled that could compromise participation in the study. * Patients with serum bilirubin\> under limit normal and / or Alanine Transaminase (ALAT) and Aspartate Transaminase (AST) 3.5 times the under limit normal with alkaline phosphatase greater than 6 times the under limit normal. * Cardiovascular disease or clinically significant cardiovascular disorder in the judgment of the investigator, such as, but not limited to uncontrolled hypertension, congestive heart failure The New York Heart Association (NYHA) classification\> III), unstable angina, myocardial infarction in 6 months prior to treatment, uncontrolled arrhythmias, chronic liver or renal disease, severely impaired lung function. * Disorders significant acute gastrointestinal or recent with a major symptom of diarrhea, such as Crohn's disease, malabsorption syndrome or diarrhea Common toxicity Criteria for Adverse Events (CTCAE) grade\> 1 whatever aetiology. * Performance Status and / or laboratory tests incompatible with chemotherapy using cisplatin, docetaxel and 5-fluorouracile (5-FU) * Inability to submit to medical monitoring test for geographical reasons, family, social or psychological. * Patients refusing to participate in biological assessments. * Persons deprived of liberty or guardianship. * Pregnant women or likely to be at the time of enrollment or during breastfeeding. * Free, informed and signed not obtained.