Preclinical evidence suggests non-THC cannabinoids, particularly CBD, can inhibit cancer cell growth through multiple mechanisms including receptor modulation and redox changes, plus offer anti-inflammatory effects relevant to the tumor environment.
Cancer researchers, patients interested in cannabinoid science, and oncologists.
Multiple anti-cancer mechanisms identified for CBD
What the researchers found
THC can inhibit cancer cell growth via CB1R and CB2R modulation, but clinical confirmation is lacking. Non-THC cannabinoids like CBD work through different mechanisms: non-CB1R/CB2R G-protein-coupled receptors, neurotransmitter receptors, and transcription factors that modulate oncogenic signaling and redox homeostasis. Cannabinoids also have anti-inflammatory properties relevant to peritumoural edema and the tumor immune microenvironment.
Why it matters
Low-THC cannabis and CBD products are widely available without the psychoactive effects of THC. Understanding their anti-cancer mechanisms could inform future treatment development without the barriers associated with THC.
The numbers in context
No specific clinical data. Review covered preclinical evidence across multiple cancer types and cannabinoid compounds.
How the study worked
Review documenting emerging mechanisms of anti-cancer actions of non-THC cannabinoids, covering preclinical evidence from cell and animal studies.
What this study cannot tell us
Entirely preclinical evidence. No human clinical trials confirm anti-cancer effects. In vitro results often do not translate to clinical benefit. Doses used in lab studies may not be achievable in humans.
How to read the evidence
Comprehensive review of preclinical evidence, but no human clinical data for anti-cancer effects.
When this study was published
2020 review.
The bigger picture
The shift toward non-THC cannabinoids for cancer research sidesteps the psychoactive and regulatory challenges of THC while potentially offering therapeutic benefits through distinct mechanisms.
Questions still open
- Will any non-THC cannabinoid advance to clinical cancer trials? Could CBD be combined with standard chemotherapy for additive effects?
Common questions
Can CBD treat cancer?
How might non-THC cannabinoids fight cancer?
Read the original research
Can Hemp Help? Low-THC Cannabis and Non-THC Cannabinoids for the Treatment of Cancer.
Cancers, 12(4)
Citation
Afrin, Farjana; Chi, Mengna; Eamens, Andrew L; Duchatel, Ryan J; Douglas, Alicia M; Schneider, Jennifer; Gedye, Craig; Woldu, Ameha S; Dun, Matthew D. (2020). Can Hemp Help? Low-THC Cannabis and Non-THC Cannabinoids for the Treatment of Cancer.. Cancers, 12(4). https://doi.org/10.3390/cancers12041033
Explore the wider topic
- CBD Oil Quality Guide: How to Avoid Snake Oil
- Anxiety After Quitting Weed: When to Consider Medication
- Cannabis for Chemotherapy Nausea: What the Evidence Actually Shows
- Cannabis for Chronic Pain: What the Research Actually Supports
- Cannabis and Epilepsy: The Epidiolex Story and What It Means
- Does CBD Actually Work for Anxiety? What the Evidence Shows
- Does CBD Help with Weed Withdrawal? What Studies Show
- CBD vs THC: The Differences That Actually Matter
- The Proven Medical Benefits of Cannabis: What Research Supports
- Quitting Weed Before Surgery
- Weed and Medications: What Changes When You Quit
- Quitting Weed During Pregnancy: What You Need to Know
- Quitting Weed While Pregnant: What You Need to Know
- Cannabis and Older Adults: Risks Seniors Should Know
- Cannabis and Breastfeeding: THC in Breast Milk