CBD has broad antitumor potential, says new study

A new study published in late 2025 suggests that cannabidiol (CBD) could play an important role in future cancer treatments.

According to researchers, this non-psychoactive cannabinoid has «considerable potential as an antitumor agent» due to its ability to interfere with several biological mechanisms that enable tumors to grow, spread, and resist treatment.

This study, funded by the National Natural Science Foundation of China and published in the journal Phytomedicine, analyzed a wide range of preclinical studies examining the effects of CBD on various forms of cancer. Although this article has not yet been peer-reviewed, it joins a growing body of literature exploring cannabinoids beyond symptom management.

How CBD Interacts with Cancer Cells

«CBD exhibits multi-targeted antitumor effects by disrupting key characteristics of cancer,» the authors write.

Rather than focusing on a single approach, the CBD appears to influence several biological systems simultaneously. Cancer cells often survive by hijacking the normal cellular signals related to growth, stress management, and the immune response. The novel finding highlighted in the study is that CBD appears to act simultaneously on several of these systems, increasing the pressure on tumor cells until they can no longer adapt.

The researchers examined aggressive cancers such as glioblastoma, as well as more common forms, including cancers breast, of the lung, colorectal, of the ovary and of the prostate. In all of these models, CBD has consistently demonstrated its ability to slow tumor growth and limit metastasis.

In studies on the colorectal cancer, for example, CBD interferes with the GPR55, a receptor that promotes tumor growth and cell migration. Blocking this receptor weakens the pathways involved in rapid cell division and, in some cases, increases the tumor’s sensitivity to chemotherapy. Other studies have shown that the Reduced CBD the expression of genes associated with aggressive cancer behavior while activating stress-related pathways that slow down cell proliferation.

Specific responses for different types of cancer

Different types of cancer appear to respond to CBD in distinct yet similar ways. In the non-small cell lung cancer, the combination of CBD and THC has reduces tumor growth by interfering with the epithelial-mesenchymal transition, a process that allows cancer cells to spread throughout the body.

In the breast cancer models, CBD has been shown to halt cell division, trigger programmed cell death, and activate autophagy—a self-digestion mechanism that, when overstimulated, becomes destructive to cancer cells.

One of the study’s key findings concerns both the therapeutic potential and patient tolerance:

«Cannabidiol (CBD), an FDA-approved compound that is well tolerated, shows promising antitumor effects by inhibiting cancer growth, metastasis, and angiogenesis, while also relieving cancer-related symptoms such as pain and nausea.»

The CBD has low oral bioavailability, which means that a large portion of the compound is broken down before it reaches the tumor tissue. To address this, scientists are exploring delivery systems based on nanoparticles designed to improve absorption, target tumors more precisely, and reduce unwanted side effects.

The authors also explain that laboratory results alone are not enough. To translate these findings into practical medical applications, it will be necessary to conduct carefully designed clinical trials and use advanced analytical tools such as the single-cell sequencing in order to understand how different tumor populations respond.

«Future trials will need to stratify patients based on tumor type and molecular markers in order to establish correlations between dosage, timing of administration, and efficacy,» the researchers noted.

This study is part of a broader shift in medical research and policy. In 2025, a study published in Pharmacology & Therapeutics suggested that certain cannabinoid-based therapies could improve the effectiveness of chemotherapy drugs. Other studies have reported a quality improvement quality of life for cancer patients who are undergoing treatment made from cannabis.