e15187 Background: HCC is the second leading cause of cancer related deaths worldwide and incidence is increasing. Most HCC patients are diagnosed late-stage and with pain. Understanding the nature of pain experienced by HCC patients is complicated by co-morbid (including other liver) diseases and treatment related pain. The purpose of this study was to identify pain symptoms that are important and relevant to HCC patients who have received systemic therapy. Methods: We conducted semi-structured thematic interviews with 10 HCC patients who were currently on or previously had received oral systemic therapy (e.g., sorafenib) and had not received local or loco-regional therapy (e.g., surgery, radiation or chemo-embolization) within 4 weeks of the interview. Interviews included open elicitation of key symptoms, side effects and concerns. Patients also completed selected pain items from the FACT-Hep; items had previously been validated for patients with hepatobiliary cancers. Results: Mean age was 58 years (range 33-77); 2 patients had co-morbid cirrhosis, 1 had co-morbid hepatitis, and 4 patients had cirrhosis and hepatitis. When asked to describe the symptoms, side-effects or other issues that most significantly impact their quality of life, patients most often mentioned fatigue (n=5), diarrhea (n=5), skin toxicities (n=5), and loss of appetite (n=4). Nine patients reported experiencing pain over their HCC treatment course. Abdomen (N=7) and lower back (N=3) were the most common sites of pain; 2 patients reported only experiencing temporary pain from prior chemoembolization. The other 7 patients experienced ongoing pain, partly attributed to systemic therapy, ascites, or metastases. Ongoing abdominal and back pain were frequently not attributed to a specific cause. All patients indicated that FACT-Hep items adequately assessed their pain. Conclusions: Although pain was not a major driver of quality of life and for a few HCC patients it was transient and treatment-related, the majority of patients experienced some persistent pain. Abdominal pain and back pain were the most common pain sites for HCC patients. These results support the relevance of pain symptoms that have been previously identified as important in HCC.