Wong AK, Grobler A, Le B. ENhANCE trial protocol: A multi-centre, randomised, phase IV trial comparing the efficacy of oxycodone/naloxone prolonged release (OXN PR) versus oxycodone prolonged release (Oxy PR) tablets in patients with advanced cancer.
Contemp Clin Trials Commun 2022;
30:101036. [PMID:
36407843 PMCID:
PMC9672918 DOI:
10.1016/j.conctc.2022.101036]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 09/01/2022] [Accepted: 11/07/2022] [Indexed: 11/14/2022] Open
Abstract
Background
Oxycodone is a frequently used opioid in cancer. Opioid-induced constipation (OIC) is common. Oxycodone/Naloxone Prolonged Release (OXN PR) contains naloxone, which mitigates OIC. Trials have either focused on non-cancer pain, or conducted before significant experience of using OXN PR. This trial aims to: demonstrate (1) analgesic equivalence between OXN PR and Oxycodone Prolonged Release (Oxy PR), and (2) superiority of constipation outcomes in OXN PR compared to Oxy PR in cancer pain. Unlike other trials, it will only include patients with at least moderate pain scores (≥4/10), allow usual laxatives, and exclude potential liver dysfunction.
Methods
This is a multi-centre, open-label, randomised, phase IV study of OXN PR vs Oxy PR in patients with cancer-related pain. The primary outcome is pain difference on Brief Pain Inventory-Short Form (BPI-SF) at 5 weeks. Secondary outcomes are comparison of other pain outcomes (BPI-SF) and neuropathic pain measures (Leeds Assessment of Neuropathic Symptoms & Signs (S-LANNS)), constipation (Bowel Function Index (BFI)), quality of life (EORTC-QLQ-C30), rescue analgesia use, total opioid dose, and total laxative dose over 5 weeks.
Conclusion
The comparison of analgesic efficacy between both arms, and superiority of constipation in the OXN PR arm will add new knowledge on the comparisons of both agents, and oxycodone independently. This trial will extend knowledge of the effectiveness, safety, and adverse effect profiles of both drugs in terms of pain, constipation, quality of life outcomes for patients with cancer pain, and provide clinicians with high quality data to guide decision making.
Trial registration
Name of the registry: ANZCTR
Trial registration number
ACTRN12619001282178
Date of registration
17/09/2019
URL of trial registry record
https://www.anzctr.org.au/Trial/Registration/TrialReview.aspx?id=377673&isReview=true
Protocol version 2.1_28 August 2020
Opioid-induced constipation is the commonest side effect in cancer pain management.
Oxycodone/naloxone prolonged release aims to reduce opioid-induced constipation.
Trials have little focus on cancer pain, concurrent liver impairment, and laxatives.
This trial evaluates these key problems practically to guide decision making.
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