8 Background: Terminally ill patients can decide end-of-life preferences with physicians in Physician Orders for Life-Sustaining Treatment (POLST) form. We did multi-center, prospective study to assess the feasibility of completing the POLST form in real oncologic practice. Methods: The inclusion criteria were patients with terminal cancer, age ≥20, and sufficient to communicate. The primary end point was the completion rate of the POLST. The questionnaire about the barriers from physicians or patients was asked to whom refused the POLST discussion. Results: From June to December 2017, 336 patients were enrolled from seven hospitals. The median age was 66 (20–94) years, 52.7% were male, 60.4% showed ECOG 3/4, and hepato-pancreato-biliary (26.2%) was the most common origin, followed by lung (23.2%) and gastro-intestinal (19.9%). Patients were in various situations: hospice care (41.2%), after progression (37.9%), under active treatment (15.8%), or just diagnosed as cancer (5.1%). The expected survival duration was 10.6 ±7.3 months. The POLST forms were introduced in 60.1%, and 31.3% signed the form. The barriers from physicians were reluctance of family members (49.7%), lack of rapport (44.8%), patients’ denial of prognosis (34.3%); lack of time (22.7%), guilty feeling (21.5%), prognostic (21.0%) or time (16.6%) uncertainty. The barriers from patients were lack of knowledge/understanding in 41.3% for each, denial of prognosis (14.3%), emotional discomfort (63.5%), and difficulty in making decision by themselves (66.7%). Conclusions: One-third of patients completed the POLST forms, and various barriers were found. To overcome those barriers, social engagement, education, and systemic support might be necessary.