The alternative hypothesis (H1) is pCR ≥20% and null hypothesis (H0) pCR≤10%. A 2-stage design will be used to estimate the number of pts required. Out of 90 pts overall, with the first stage of 49 pts, ≥6 pCR will be required in the first stage, and ≥13 pCR in the whole study population (80% power and a 2-sided test of significance at the 10% level).