151. Comparison of the Tolerability Profile of Controlled-Release Oral Morphine and Oxycodone for Cancer Pain Treatment. An Open-Label Randomized Controlled Trial.
- Author
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Zecca, Ernesto, Brunelli, Cinzia, Bracchi, Paola, Biancofiore, Giuseppe, De Sangro, Carlo, Bortolussi, Roberto, Montanari, Luigi, Maltoni, Marco, Moro, Cecilia, Colonna, Ugo, Finco, Gabriele, Roy, Maria Teresa, Ferrari, Vittorio, Alabiso, Oscar, Rosti, Giovanni, Kaasa, Stein, and Caraceni, Augusto
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DRUG tolerance , *CANCER pain treatment , *CONTROLLED release drugs , *MORPHINE , *OXYCODONE , *RANDOMIZED controlled trials , *ANALGESICS , *COMPARATIVE studies , *CONTROLLED release preparations , *LONGITUDINAL method , *RESEARCH methodology , *MEDICAL cooperation , *NARCOTICS , *PALLIATIVE treatment , *RESEARCH , *EVALUATION research , *PAIN measurement , *RELATIVE medical risk , *TREATMENT effectiveness - Abstract
Context: Oxycodone and morphine are recommended as first-choice opioids for moderate/severe cancer pain, but evidence about their relative tolerability has significant methodological limitations.Objectives: This study was mainly aimed at comparing the risk of developing adverse events (AEs) with controlled-release oral morphine vs. oxycodone; secondary aims were comparing their analgesic efficacy and testing heterogeneity in tolerability across different age and renal function subgroups.Methods: An open-label multicenter RCT (EudraCT number: 2006-003151-21) was carried out in patients with moderate/severe cancer pain. At baseline, 7 and 14 days, patients scored on 0-10 rating scales (0-10 numerical rating scale) the intensity of pain and of a list of common opioid side effects. The primary end point was the percentage of patients reporting an AE (a worsening ≥ 2 points on any of the listed side effects); tolerability by subgroups and average follow-up pain intensity were compared through regression models.Results: One hundred eighty-seven patients were enrolled (47% of originally planned). Intention to treat (ITT) analysis (N = 185, morphine 94, oxycodone 91) did not show any difference in the risk of developing AEs (risk difference -0.6%, 95% CI -11.0% to 9.9%) nor in analgesia (0-10 numerical rating scale pain intensity difference -0.28, 95% CI -0.83 to 0.27). No evidence of heterogeneity of tolerability across age and renal function patient subgroups emerged.Conclusion: This trial failed to show any difference in tolerability and analgesic efficacy of morphine and oxycodone as first-line treatment for moderate/severe cancer pain but results interpretation is difficult due to lack of power, potential bias from open-label design, and concerns about assay sensitivity. These data, however, can significantly contribute to future meta-analyses comparing WHO Step-III opioids and are relevant in designing future randomized studies. [ABSTRACT FROM AUTHOR]- Published
- 2016
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