Experimental plan Assumption: to increase the local control rate at 3 months from 17% to 40%. A two-staged Gehan plan will be implemented. The assumption of therapeutic efficacy is π = 0.4 - In the first stage, 6 patients will receive a radiotherapy dose boost on the hypoxic lesions. If no local control is observed in these 6 patients, the trial will be stopped (power 0.95). In a second stage, the number of patients to be included will be determined according to the number of local controls in stage 1, the desired precision being set to ε = 0.10 (n=19 maximum).