Characteristics and oncological results of epidermoid anal carcinoma: Comparison analysis between immunocompetent and immunosuppressed patients Yolanda Saralegui Ansorena; Jose Maria Enriquez-Navascues; Carlos Placer Galan; Nerea Borda Arrizabalaga; Jose Luis Elosegui Aguirrezabala; Garazi Elorza Echaniz; Ane Etxart Lopetegi; Ignacio Aguirre Allende;