The study is designed to verify the statistical hypothesis that histotype-tailored approach is associated, overall, with a 30% reduction in the hazard of relapse. However, in each different histological group, the effect of histotype-tailored chemotherapy, as compared to standard chemotherapy, can be different. To address this weakness an orthogonal study of response to chemotherapy as a surrogate of DFS and OS has been introduced into the trial. This study intends to extensively investigate the response (radiological and pathological) to preoperative chemotherapy and to validate it as a surrogate endpoint by showing that it correlates with disease free survival and overall survival.