A clinical review found that cannabis may help cancer patients manage pain, nausea, appetite loss, insomnia, and depression, with emerging preclinical evidence suggesting possible direct anti-tumor effects.
Cancer patients and caregivers interested in the evidence for cannabis in cancer care.
Vaporized cannabis did not alter plasma opioid levels, suggesting safe co-use with opioid pain medications
What the researchers found
This review examined the role of cannabis in cancer care across multiple domains. For symptom management, the evidence supported cannabis use for chemotherapy-induced nausea and vomiting, appetite stimulation, pain management (potentially synergistic with opioids), and peripheral neuropathy relief.
Inhaled cannabis was found to be more effective than placebo for peripheral neuropathy, and a pharmacokinetic study showed that vaporized cannabis did not significantly alter plasma opioid levels in patients on stable opioid therapy, suggesting safe co-administration with possible synergistic pain relief.
Beyond symptoms, the review noted a growing body of preclinical research showing anti-tumor effects of cannabinoids through mechanisms involving apoptosis, anti-angiogenesis, and metastasis inhibition. However, no clinical trials had been conducted to confirm these effects in humans.
Why it matters
Cancer patients often use cannabis, with or without medical guidance. This review provides oncologists and patients with an evidence-based framework for understanding where cannabis might fit into cancer care, from well-supported symptom management to speculative anti-tumor potential.
The numbers in context
Vaporized cannabis did not produce clinically significant changes in plasma opioid levels. Multiple preclinical studies showed anti-tumor effects through apoptosis, anti-angiogenesis, and metastasis inhibition. No clinical trials on direct anti-cancer effects had been completed at the time of publication.
How the study worked
This was a clinical review article published in a medical oncology journal, synthesizing evidence from clinical trials, pharmacokinetic studies, preclinical research, and anecdotal reports about cannabis use in cancer care.
What this study cannot tell us
The review acknowledged a lack of clinical trials for direct anti-cancer effects. Anecdotal reports of remarkable responses do not constitute clinical evidence. The symptom management evidence, while more robust, still has gaps regarding optimal dosing, formulations, and patient selection.
How to read the evidence
This is a clinical review synthesizing evidence of varying quality. Symptom management evidence draws on clinical trials, while anti-tumor claims rest on preclinical data and anecdotal reports.
When this study was published
Published in 2016. Clinical trials on cannabis and cancer have continued since, though evidence for direct anti-tumor effects in humans remains limited.
The bigger picture
The review highlights a gap between preclinical promise and clinical evidence for cannabis as a direct cancer treatment. While symptom management uses are better supported, the anti-tumor findings from laboratory and animal studies continue to drive interest in clinical trials.
Questions still open
- Will human clinical trials confirm the anti-tumor effects seen in preclinical research? What are the optimal dosing strategies for cannabis in cancer symptom management?
Common questions
Can cannabis cure cancer?
Is it safe to use cannabis alongside chemotherapy?
Read the original research
Integrating cannabis into clinical cancer care.
Current oncology (Toronto, Ont.), 23(2), S8-S14
Citation
Abrams, D I. (2016). Integrating cannabis into clinical cancer care.. Current oncology (Toronto, Ont.), 23(2), S8-S14. https://doi.org/10.3747/co.23.3099
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