14 Background: Opioid pharmacotherapy is used to manage moderate and severe pain in palliative care (PC). Pain affects 80% pancreatic cancer patients older than 65 years. We assessed the opioid utilization patterns in Medicare patients with pancreatic cancer whom did not use PC (NPC), used community-based PC (CBPC) or used hospital-based PC (HBPC). Methods: We assessed opioid use, types, dispensed days, opioid uptake rates, doses (measured by morphine equivalent doses (MEDs)), and related adverse events (AEs) after pancreatic cancer diagnosis in Medicare beneficiaries selected from the SEER-Medicare database between 2007 and 2013 using the log-binomial, generalized linear mixed, and Cox proportional hazards modeling. Results: 16,106 patients were identified (median age: 78 years; female: 55.2%), of whom 8.3% used CBPC and 19.6% used HBPC. PC users were more likely to use opioids (CBPC: 72.2% vs. HBPC: 63.4% vs. NPC: 56.3%, P<.001). The most commonly prescribed opioid type in NPC, HBPC and CBPC users was fentanyl (54.1%), hydromorphone (27.7%) and morphine (26.1%). Compared to other study patients, CBPC users had shorter median dispensed days per prescription (CBPC: 3 days vs. HBPC: 4 days vs. NPC: 4 days, P<.001) but higher median MEDs per prescription (CBPC: 25 mg vs. HBPC: 25 mg vs. NPC: 0.13 mg, P<.001). Adjusting for demographic and clinical factors, no significantly different uptake rates of opioids were determined in PC users compared to NPC users (CBPC: RR, 1.02, P=.057; HBPC: RR, 1.002, P=.783). HBPC users had higher adjusted daily MEDs than CBPC and NPC users 3 months after diagnosis (135.1 mg/d vs. 126.5 mg/d vs. 65.7 mg/d, P<.001). CBPC users had higher adjusted daily MEDs than HBPC and NPC users 3 months before death (164.3mg/d vs. 155.6 mg/d vs. 92.1 mg/d, P=.0002). CBPC users had lower but HBPC users had higher adjusted hazard ratios of delirium (CBPC: HR, 0.95, HBPC: HR, 1.26, P<.001) and drowsiness (CBPC: HR, 0.94, HBPC: HR, 1.53, P<.001) than NPC users. Conclusions: Older pancreatic cancer patients using PC tended to use opioids and consumed higher opioid doses. CBPC users had lower risks of opioid-related delirium and drowsiness. The factors of the opioid use variations need to be assessed.
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