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The study aimed to investigate the analgesic effect of a combination of intravenous flurbiprofen axetil and opioids, and evaluate the relationship between refractory pain relief and plasma β-endorphin levels in cancer patients.

Intravenous Flurbiprofen Axetil Enhances Analgesic Effect of Opioids in Patients with Refractory Cancer Pain by Increasing Plasma β-Endorphin