Drug Repurposing for Cancers With Limited Survival: Protocol for a Retrospective Cohort Study - Alejandro Rodríguez-Molinero; Carlos Pérez-López; Jose L Salazar González; Esther Garcia-Lerma; Juan A Álvarez-García; Luis M Soria Morillo; Tomás Salas Fernández (JMIR Research Protocols, 2023)