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Repurposed Drugs in Cancer Therapy: Disulfiram
Repurposed Drugs in Cancer Therapy: Disulfiram. Repurposing existing drugs for cancer therapy is one of the fastest-growing areas of oncology research. One surprising candidate is disulfiram, an FDA-approved drug used since the 1950s to treat alcohol dependence.
Over the past two decades, scientists have discovered that disulfiram may also have anti-cancer properties, particularly when combined with copper. Researchers are studying the drug in several cancers, including glioblastoma, breast cancer, pancreatic cancer, melanoma, and leukemia.
But what does the science actually show?
Below is an evidence-based overview of how disulfiram may work against cancer, what clinical trials show so far, and what researchers still need to learn.
If you’d like to learn more about repurposed drugs and cancer treatment, click now.
Thank you,
David Emerson
What Is Disulfiram?
Disulfiram (brand name Antabuse) is an FDA-approved medication used to treat alcohol dependence. It works by blocking the enzyme aldehyde dehydrogenase (ALDH), causing unpleasant symptoms when alcohol is consumed.
Interestingly, that same enzyme system appears to be involved in cancer stem cells, which may explain why disulfiram has attracted attention as a potential anti-cancer therapy.
Because the drug is:
- Already FDA-approved
- Inexpensive
- Well studied for safety
researchers have explored whether it could be repurposed for oncology.
How Disulfiram May Fight Cancer
Research suggests disulfiram may combat cancer through several biological mechanisms:
- Targeting cancer stem cells by inhibiting ALDH enzymes.
- Blocking proteasome activity, disrupting cancer cell survival pathways.
- Increasing oxidative stress in tumor cells, leading to apoptosis.
- Enhancing chemotherapy and radiation sensitivity.
- Forming anti-tumor complexes with copper (DSF-Cu) that damage cancer cells.
These mechanisms have been demonstrated in laboratory and animal studies across multiple cancer types.
Double trouble: A drug for alcoholism can also treat cancer by targeting macrophages
Why Copper Matters
One of the most important discoveries about disulfiram is that its anticancer effects appear much stronger when combined with copper.
When disulfiram interacts with copper in the body, it forms a complex called Cu(DDC)₂, which can:
- Inhibit the proteasome in cancer cells
- Increase reactive oxygen species (ROS)
- Trigger cancer cell death
Laboratory studies show this disulfiram-copper complex can strongly inhibit tumor growth and enhance the effects of chemotherapy drugs.
This is why many clinical trials evaluate disulfiram combined with copper supplementation.
Cancers Being Studied
Researchers have investigated disulfiram in several cancers:
Brain Cancer (Glioblastoma)
Glioblastoma has been one of the main targets for disulfiram research because the drug can cross the blood-brain barrier.
Clinical trials have explored disulfiram with:
- Temozolomide chemotherapy
- Radiation therapy
- Copper supplementation
Breast Cancer
Preclinical studies show that disulfiram may inhibit tumor growth and reduce metastasis in breast cancer models.
Clinical trials have also investigated disulfiram-copper therapy in metastatic breast cancer.
Pancreatic Cancer
Researchers are studying whether disulfiram can sensitize tumors to gemcitabine chemotherapy, potentially improving treatment response.
Leukemia
Some studies suggest leukemia cells may be particularly sensitive to disulfiram-induced oxidative stress and apoptosis.
What Clinical Trials Show So Far
While laboratory evidence is promising, human results are mixed.
For example, a randomized clinical trial in patients with recurrent glioblastoma tested disulfiram plus copper added to chemotherapy. Researchers found:
- No significant improvement in survival
- Higher rates of adverse events in the disulfiram group
The authors concluded the regimen should not currently be recommended for glioblastoma treatment.
However, other early-phase trials suggest certain molecular subtypes of tumors may respond better, and further research is ongoing.
Why Results Have Been Inconsistent
Several scientific challenges may explain why promising lab results have not always translated into clinical success:
1. Drug Stability
Disulfiram breaks down rapidly in the bloodstream, limiting how much active drug reaches tumors.
2. Copper Availability
The anti-cancer complex forms only if enough copper is present.
3. Drug Delivery
Researchers believe improved drug delivery systems, including nanoparticles, may enhance the effectiveness of disulfiram.
Potential Advantages of Disulfiram
Despite mixed clinical results, disulfiram remains attractive as a repurposed therapy because:
- It is inexpensive and widely available
- Its safety profile is well known
- It may target cancer stem cells, which are linked to relapse
- It may enhance chemotherapy and radiation effects
These characteristics make it an interesting candidate for combination therapies.
The Bottom Line
Disulfiram is a fascinating example of how an old drug can reveal unexpected anti-cancer activity.
Current evidence shows:
- Strong anti-tumor effects in laboratory studies
- Promising mechanistic targets such as ALDH and proteasome inhibition
- Mixed results in human clinical trials
More research—particularly improved drug delivery and biomarker-guided trials—will determine whether disulfiram ultimately becomes a useful therapy in oncology.
For now, it remains an experimental approach being studied in clinical trials, not a standard cancer treatment.
Key Research on Disulfiram and Cancer
- https://pmc.ncbi.nlm.nih.gov/articles/PMC9161604/
- https://pubmed.ncbi.nlm.nih.gov/27141876/
- https://pubmed.ncbi.nlm.nih.gov/23033007/
- https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2802966
- https://pmc.ncbi.nlm.nih.gov/articles/PMC10963497/
- https://pmc.ncbi.nlm.nih.gov/articles/PMC6325620/
- Repurposed Drugs in Cancer Therapy: Disulfiram
- Repurposed Drugs in Cancer Therapy: Disulfiram
To Learn More About Repurposed Drugs for Cancer-
- Fenbendazole and Cancer: What the Research Really Shows”
- Mebendazole and Cancer: Anti-Tumor Mechanisms and Studies”
- Repurposed Drugs in Cancer Therapy: What the Science Shows”
- Metformin and Cancer: Why a Diabetes Drug Is Being Studied for Tumors
- Repurposed Drugs in Cancer Therapy: What the Science Shows
- Repurposed Drugs + Chemotherapy: Integrative Treatment