Epidemiology and prognosis of patients with a history of cancer admitted to intensive care. A multicenter observational study P.M. Olaechea Astigarraga; F. Álvarez Lerma; C. Beato Zambrano; R. Gimeno Costa; F. Gordo Vidal; R. Durá Navarro; C. Ruano Suarez; T. Aldabó Pallás; J. Garnacho Montero;