Capecitabine versus 5-fluorouracil/folinic acid as adjuvant therapy for stage III colon cancer: final results from the X-ACT trial with analysis by age and preliminary evidence of a pharmacodynamic marker of efficacy. - Twelves, C.; Scheithauer, W.; McKendrick, J.; Seitz, J.-F.; Van Hazel, G.; Wong, A.; Díaz-Rubio, E.; Gilberg, F.; Cassidy, J. (Annals of Oncology, 2012)