Phase II The sample size calculation was based on a Simon optimal two-stage design, with a minimum success (8-week non progression) rate considered of interest p1=60% and an uninteresting rate p0=40%. Assuming a type I error alpha of 0.05 and 80% power, 46 evaluable patients are needed in the experimental arm to reject the null hypothesis H0: p≤p0 versus the alternative hypothesis H1: p ≥ p1 in a unilateral situation (16 patients in Stage I and 30 additional patients in Stage II).