Dynamed presents an overview on current evidence in an entry for Opioids for Chronic Cancer Pain.
More information is provided for specific opioids, recommendations, and guidelines; also included are links to specific review articles.

See Joanna Briggs Institute EBI Database evidence summaries:

Cancer Patients: Pain Control (Management Principles). Susan Slade. [Evidence Summaries]. AN: JBI1758. 2016

Pain management (older individuals): Intermittent Subcutaneous Analgesics. Dao Le, Long Khanh. [Evidence Summaries]. AN: JBI1142. 2017

Cancer Patients: Pain Control (Treatment with Opioid drugs). Obeid, Stephanie. [Evidence Summaries]. AN: JBI1759. 2016

Updated links for entries in Joanna Briggs, 10/16/2017 ldt