Post-operative Radiotherapy With Cisplatin Alone or in Combination With Iressa in Upper Aerodigestive Tract Carcinomas

Inclusion Criteria: * Patients with upper aerodigestive tract carcinomas (all sites included) having surgical resection and eligible for post-operative radiation + cisplatin. * Patient having a tumoral biopsy (0.5 - 1 cm3) stored in liquid nitrogen at time of surgical resection (patients with small tumors located in larynx for instance will not be included) * Patients receiving post-operative radiation (\>=60 Gy on tumor bed and/or cervical area), associated with cisplatin, 6 weeks after surgery at the latest. Exclusion Criteria: * previous history of cancer (except skin basal cell carcinoma)