- Capecitabine as first-line treatment for patients older than 70 years with metastatic colorectal cancer: an oncopaz cooperative group study. Feliu, J., Escudero, P., Llosa, F., Bolaños, M., Vicent, J.M., Yubero, A., Sanz-Lacalle, J.J., Lopez, R., Lopez-Gómez, L., Casado, E., Gómez-Reina, M.J., González-Baron, M. J. Clin. Oncol. (2005)