Intensive care unit (ICU) admission of patients with cancer has long been controversial. Studies performed in the early 1990s demonstrated high mortality rates in cancer patients admitted to the ICU, especially among those with respiratory failure requiring mechanical ventilation, neutropenic sepsis, and in hematopoietic stem cell transplant (HSCT) recipients [1, 2]. Additionally, a lack of cost-effectiveness was noted and some authors argued that denial of ICU admission could avoid futile care and unwarranted aggressive therapy in dying patients [3, 4].Over the past decade, however, studies that report prognosis and predictive factors for mortality in critically ill cancer patients have shown different results [5][6][7][8][9][10]. Although mortality remains high when compared to the general population of critically ill patients, these studies have demonstrated meaningful ICU and hospital survival rates and some of them improved survival over time [5][6][7][8]. Unadjusted ICU and hospital mortality rates have been found to decrease progressively [9]. However, these findings were mainly reported by single center cohort studies and usually involved a small number of patients [9]. A recent, prospective multicenter study of 1,011 critically ill patients with hematological malignancies [5] reported encouraging hospital, 90-day, and 1-year survival rates of 60.7, 52.5, and 43.3 %, respectively compared with the poor outcomes reported 15-20 years ago [1, 2, 5, 9]. Similarly, although hospital mortality remained high in those patients requiring mechanical ventilation (60.5 %), this mortality rate is significantly lower than the over 90 % mortality rates in mechanically ventilated cancer patients that were earlier reported [1, 2, 5]. Recent studies have also confirmed that complete or partial remission of the underlying disease, lack of comorbidities, and good performance status are associated with increased risk of survival whereas some of the usual prognostic factors such as neutropenia failed to be associated with adverse outcomes [5, 6, 10].Improved survival has also been demonstrated in subgroups of critically ill cancer patients including those with neutropenic sepsis [7], myeloma patients [10], and to a lesser extent in HSCT recipients [11]. Similarly, the outcome of cancer patients admitted to the ICU with severe sepsis or septic shock [6], acute respiratory distress syndrome (ARDS) [8], or those requiring mechanical Intensive Care Med (2014) 40:1570-1572