STUDY DESIGN/ Evaluation criteria Main criterion: efficacy The main criterion is the disease-free survival at 3 years. Disease-free survival is the time delay between the date of randomization and the date at which the 1st cancer-related event such as local relapse, distant metastasis, a second cancer or death from any cause is observed. Patients without event at the time of anlaysis will be censored at the date of last follow-up visit.