# Durable complete response of advanced hepatocellular carcinoma using cannabis oil: a report of two cases

## TL;DR

Two elderly patients with advanced liver cancer showed complete tumor regression after using cannabis oil, suggesting potential anti-tumor effects of cannabinoids.

## Contribution

Reports two cases of advanced HCC with complete tumor regression following cannabis oil use, highlighting potential anti-tumor effects.

## Key findings

- Two patients with advanced HCC showed durable complete tumor regression after using cannabis oil.
- Cannabinoids may have anti-tumor properties based on these observations and prior preclinical research.
- The findings suggest a need for clinical trials to investigate cannabinoids as a treatment for advanced HCC.

## Abstract

Hepatocellular carcinoma (HCC) is a leading cause of cancer-related mortality worldwide with a grim prognosis. Current treatment options for advanced HCC are limited, and a large proportion of patients is not amenable to any form of treatment, with best supportive care as the only remaining option. Meanwhile, the use of cannabis-derived products is rising in oncological patients who are seeking symptom relief. Cannabinoids, similar to endogenous endocannabinoids, have shown promise in recent preclinical cancer research due to their ability to interact with various signaling pathways and molecular mechanisms of interest.

In this report, we present two patients (A aged 82 and B 77, respectively) with advanced HCC with a high tumor burden who demonstrated durable and complete regression after use of cannabis oil (A 10% delta-9-tetrahydrocannabinol (THC) and 5% cannabidiol (CBD), two droplets sublingually three times daily and B 15% THC and 2% CBD, 5 droplets sublingually two times daily) for symptom relief. The observations in this report build on previous (pre)clinical research highlighting the potential anti-tumor qualities of cannabinoids and stress the need for clinical trials investigating the anti-tumor effects of cannabinoids in cancer patients.

Based on the two cases presented here, we call for further research into the potential beneficial effect of cannabinoids in patients with advanced HCC.

The online version contains supplementary material available at 10.1186/s42238-025-00353-0.