- Distal intramural spread of rectal cancer after preoperative radiotherapy: The results of a multicenter randomized clinical study. Chmielik, E., Bujko, K., Nasierowska-Guttmejer, A., Nowacki, M.P., Kepka, L., Sopylo, R., Wojnar, A., Majewski, P., Sygut, J., Karmolinski, A., Huzarski, T., Wandzel, P. Int. J. Radiat. Oncol. Biol. Phys. (2006)