Researchers Reviewed Evidence That Cannabinoids Could Help Fight Brain Tumors | Research

The takeaway

Laboratory and animal studies suggested cannabinoids have anti-tumor properties against brain cancers, including slowing growth and triggering cancer cell death.

Read this if you're interested in the preclinical research behind cannabinoids and brain cancer.

Cannabinoids showed anti-proliferative, pro-apoptotic, and anti-invasive effects on brain tumor cells

What the researchers found

This review examined the accumulating evidence that cannabinoids could be effective against astrocytomas, particularly high-grade brain tumors that remain among the most difficult cancers to treat.

The authors summarized in vitro (cell culture) evidence showing cannabinoids could inhibit tumor cell proliferation, induce programmed cell death (apoptosis), and reduce tumor invasiveness. Animal studies had demonstrated that cannabinoids could slow the growth of implanted brain tumors in mice.

Beyond direct anti-tumor effects, the review highlighted cannabinoids' potential to modulate the immune cells that infiltrate brain tumors, which could either help or hinder tumor growth depending on the immune response. The authors argued that cannabinoids' combined anti-tumor and immunomodulatory properties warranted serious investigation as complementary or alternative treatments for brain cancers.

Why it matters

High-grade brain tumors (glioblastoma and other astrocytomas) remain among the deadliest cancers, with limited treatment options. The identification of cannabinoids as having anti-tumor properties in laboratory and animal settings opened a new avenue for research into these difficult-to-treat cancers.

The numbers in context

The review covered multiple in vitro and animal studies showing anti-proliferative, pro-apoptotic, and anti-invasive effects of cannabinoids on brain tumor cells.

How the study worked

This was a narrative review of published in vitro and in vivo studies examining cannabinoid effects on brain tumor cells and tumor-associated immune cells. The authors synthesized evidence across multiple study types and proposed mechanisms of action.

What this study cannot tell us

All evidence was preclinical (cell cultures and animal models) at the time of review. Tumor models in animals don't fully replicate human brain cancer biology. The psychoactive effects and other systemic impacts of cannabinoids complicate their potential clinical use.

How to read the evidence

This is a review of preclinical (laboratory and animal) evidence only. No human clinical trial data was available at the time, making the evidence preliminary.

When this study was published

Published in 2007. Since then, early-phase human clinical trials have begun testing cannabinoids as adjunct treatments for glioblastoma, with mixed but ongoing results.

The bigger picture

This review was part of a growing body of preclinical evidence that ultimately led to early-phase human clinical trials of cannabinoids as adjunct treatments for glioblastoma. The field remains active, though translating laboratory findings into effective human treatments has proven challenging.

Questions still open

Can the anti-tumor effects seen in the lab translate to meaningful clinical benefits in human patients? Which specific cannabinoids or combinations are most effective against brain tumors?

Common questions

Does this mean cannabis treats brain cancer?

No. The evidence reviewed was entirely from laboratory and animal studies. While results were promising, many substances that work in the lab fail to work in human patients. Clinical trials are still underway.

What is an astrocytoma?

A type of brain tumor that arises from star-shaped brain cells called astrocytes. High-grade astrocytomas, including glioblastoma, are among the most aggressive and difficult-to-treat cancers.

Read the original research

Targeting astrocytomas and invading immune cells with cannabinoids: a promising therapeutic avenue.

Molecular neurobiology, 36(1), 36-44

View on PubMed ↗

Citation

Cudaback, Eiron; Stella, Nephi. (2007). Targeting astrocytomas and invading immune cells with cannabinoids: a promising therapeutic avenue.. Molecular neurobiology, 36(1), 36-44.