Shifting Views on Cancer Pain Management: A Systematic Review and Network Meta-Analysis

Abstract

ContextStrong opioids are the cornerstone in the treatment of cancer-related pain. ObjectivesThis study aims to compare analgesic effectiveness of different strong opioids for the treatment of cancer-related pain. MethodsPubMed and Embase were searched for RCTs that compared strong opioids for treatment of cancer-related pain against one another. A network meta-analysis was conducted and the related Surface Under the Cumulative RAnking (SUCRA)-based treatment ranks were calculated. Primary outcome was pain intensity (numerical rating scale (NRS)) and/or the percentage of patients with ≥50% pain reduction, after 1 and 2–4 weeks. ResultsSixteen RCTs (1813 patients) were included. Methadone showed, with a high certainty of evidence, increased ORs for treatment success at 1 week, compared with morphine, buprenorphine, fentanyl, and oxycodone, range 3.230–36.833. Methadone had the highest likelihood to be the treatment of preference (ToP) (SUCRA 0.9720). For fentanyl, ORs were lower, however significant and with high certainty. After 2–4 weeks, methadone again showed the highest likelihood for ToP, however, with moderate certainty and nonsignificant ORs. The combination of morphine/methadone, compared with morphine, buprenorphine, fentanyl, hydromorphone, methadone, and oxycodone achieved a treatment effect of mean NRS difference after 2–4 weeks between −1.100 and −1.528 and had the highest likelihood for ToP. ConclusionThe results suggest that methadone possibly deserves further promotion as first-line treatment for the treatment of cancer-related pain.