CLINICAL SIGNIFICANCE OF TUMOUR REGRESSION GRADE IN LOCALLY-ADVANCED RECTAL CANCER TREATED WITH PREOPERATIVE CHEMORADIOTHERAPY - Alba, Hernandez; Eduardo, Polo; Jose Miguel, Ponce; Carlos, Hoerndler; Andres, Monzon; Luis, Sarria; Jorge, Hernando; Antonio, Anton; David S, Rosero-Cuesta; Vicente, Alonso-Orduna (ANNALS OF ONCOLOGY, 2014)