Neoadjuvant radiotherapy in stage I cancer of the lower rectum oleh José Alfredo dos Reis Neto, José Alfredo dos Reis Junior, Odorino Hideyoshi Kagohara, Joaquim Simões Neto, Sergio Oliva Banci, Luciane Hiane Oliveira, Gustavo Alejandro Gutierrez Espinoza, Antonio José Tiburcio Alves Júnior