Background: Acute Palliative Care Units (ACPUs) are novel inpatient programs in tertiary care centers that provide aggressive symptom management and assist transition to hospice. However, patients often die in the APCU before successfully transferring to hospice. The aim of this study was to evaluate the symptom burden and characteristics of advanced cancer patients who die in the APCU. Methods: We retrospectively reviewed the medical records of all advanced cancer patients admitted to the APCU between April, 2015 and March, 2016 at a tertiary cancer center in Korea. Basic characteristics and symptom burden assessed by the Edmonton Symptom Assessment System (ESAS) were obtained from consultation upon APCU admission. Statistical analyses were conducted to compare patients who died in the APCU with those who were discharged alive. Results: Of the 267 patients analyzed, 87 patients (33%) died in the APCU. The median age of patients was 66 (range, 23-97). Patients who died in the APCU had higher ESAS scores of drowsiness (6 vs 5, P = 0.002), dyspnea (4 vs 2, P = 0.001), anorexia (8 vs 6, P = 0.014) and insomnia (6 vs 4, P = 0.001) compared to patients who discharged alive. Total symptom distress scores (SDS) were also significantly higher (47 vs 40, P = 0.001). Patients who died in the APCU were more likely to be male (odds ratio [OR] for female patients 0.38, 95% confidence interval [CI] 0.22-0.67, P < 0.001) and have higher ESAS scores of drowsiness (OR 2.08, 95% CI, 1.08-3.99, P = 0.029) and dyspnea (OR 2.19, 95% CI 1.26-3.80, P = 0.005). These patients showed significantly shorter survival after APCU admission (7 days vs 31 days, P < 0.001). Conclusions: Advanced cancer patients who die in the APCU are more likely to be male and have significantly higher symptom burden that include drowsiness and dyspnea. These patients show rapid clinical deterioration after APCU admission. More proactive and timely end-of-life care is needed for these patients.