Gender differences in stage at diagnosis and preoperative radiotherapy in patients with rectal cancer oleh Cristina Sarasqueta, Mª Victoria Zunzunegui, José María Enríquez Navascues, Arrate Querejeta, Carlos Placer, Amaia Perales, Nerea Gonzalez, Urko Aguirre, Marisa Baré, Antonio Escobar, José María Quintana, on behalf of the REDISSEC-CARESS/CCR Group