Risk Factors Associated with Postoperative Infection in Cancer Patients Undergoing Spine Surgery Mauro Costa Morais Tavares-Júnior; Gabriela Estefania Delgado Cabrera; William Gemio Jacobsen Teixeira; Douglas Kenji Narazaki; Cesar Salge Ghilardi; Raphael Martus Marcon; Alexandre Fogaça Cristante; Tarcisio Eloy Pessoa de Barros-Filho;