Cancer Cells' 'Addiction' to Glutathione Reveals New Drug Target

Groundbreaking research challenges long-held beliefs about antioxidants and cancer

Mar. 24, 2026 at 6:39am

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Researchers have discovered that cancer cells can 'hijack' the antioxidant glutathione and use it as an alternative energy source to fuel their growth, particularly in nutrient-poor environments. This metabolic flexibility allows tumors to thrive even in challenging conditions. The findings suggest that in certain contexts, antioxidants may not be simply neutral, but can actively contribute to cancer progression.

Why it matters

This discovery represents a shift in cancer treatment strategy, as researchers explore ways to 'starve' cancer cells by disrupting their unique metabolic dependencies, rather than solely focusing on killing them directly. The potential extends beyond breast cancer, as preliminary studies suggest many tumors consume glutathione.

The details

Scientists at the Wilmot Cancer Institute found that cancer cells, particularly those in tumors, actively break down glutathione to utilize its components - cysteine, glycine, and glutamate - as an alternative energy source. By blocking the cancer cells' ability to process glutathione, the researchers were able to slow tumor growth in preclinical models of breast cancer. They identified a promising drug candidate that inhibits this process, and are now working to refine the drug and pinpoint the specific proteins involved in glutathione delivery to tumors.

  • The research was published in the journal Nature in March 2026.

The players

Wilmot Cancer Institute

A cancer research center at the University of Rochester that conducted the groundbreaking study on cancer cells' use of glutathione.

Isaac Harris

A researcher at the Wilmot Cancer Institute who led the study on cancer cells' metabolic flexibility and use of glutathione as an energy source.

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What they’re saying

“Cancer cells and normal cells potentially utilize different sources of food, and we discovered how cancer cells, specifically, break down this antioxidant and apply it as fuel.”

— Isaac Harris, Researcher, Wilmot Cancer Institute

What’s next

Researchers are now working to refine the promising drug candidate they identified and pinpoint the specific proteins involved in glutathione delivery to tumors, with the ultimate goal of developing targeted therapies that spare healthy cells.

The takeaway

This research highlights the complex relationship between antioxidants and cancer, and suggests that understanding how cancer cells utilize various nutrients, not just avoiding them altogether, is crucial for developing effective therapies. The findings could lead to a more nuanced understanding of the role of antioxidants in cancer development and progression.