Vitamin A could be helping cancer grow; here’s what scientists found

A new study reveals how vitamin A may help cancers hide by disabling parts of the immune system — and introduces a drug that could switch that off. (Image: Pexels)

• Vitamin A-derived retinoic acid may weaken immune response, aiding cancer growth
• KyA33 drug blocks pathway, boosts immunity in preclinical studies
• Findings may improve cancer vaccines and lead to new immune-boosting therapies

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For decades, vitamin A has been an essential nutrient for vision, immunity and development. It was also studied for being anti-cancer. However,  new research suggests there is a darker side to this familiar nutrient, one that cancers may be exploiting:

Researchers at the Princeton branch of the Ludwig Institute for Cancer Research have discovered that a vitamin A-derived molecule, known as all-trans retinoic acid, can effectively disarm parts of the immune system. Instead of helping the body fight tumours, this compound appears to encourage immune tolerance, allowing cancer to grow under the radar. Crucially, the team has also developed an experimental drug that blocks this pathway, dramatically boosting immune responses in preclinical studies.

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The findings, spread across two major studies, help resolve a long-standing scientific contradiction. In lab dishes, vitamin A derivatives can slow or even kill cancer cells. Yet large clinical trials have repeatedly shown that high vitamin A intake can increase cancer risk and mortality. The answer, it turns out, lies not in how cancer cells behave, but in how the immune system is quietly reprogrammed around them.

Dendritic cells are the immune system’s intelligence officers. They patrol the body, collect evidence of disease and present it to T cells, which then launch targeted attacks. These cells are also the backbone of dendritic cell vaccines, a promising but often disappointing form of cancer immunotherapy.

The researchers found that during the process used to make these vaccines, dendritic cells start producing large amounts of retinoic acid. This chemical signal prevents the cells from fully maturing and weakens their ability to activate anti-cancer immunity. Worse still, it encourages the immune environment towards tolerance rather than attack.

By blocking the enzymes that produce retinoic acid, the team was able to restore the immune system’s fighting spirit. Their experimental drug, KyA33, improved the performance of dendritic cell vaccines in mice and also worked as a stand-alone immunotherapy, slowing tumour growth by unleashing T cells.

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Here’s what the study says

• It explains why vitamin A can both suppress and promote cancer
• It reveals how tumours manipulate immune tolerance to survive
• It offers a way to rescue struggling cancer vaccines
• It introduces a brand-new class of immune-boosting drugs

FAQs on Immunity and Vitamin A

1. Does vitamin A increase cancer risk?

Vitamin A itself doesn’t directly cause cancer, but new research shows that a vitamin A–derived molecule may weaken immune responses, potentially helping tumours survive.

2. What is retinoic acid and why does it matter?

Retinoic acid is made from vitamin A in the body. The studies found it can suppress dendritic cells — immune cells responsible for alerting T cells to fight cancer — allowing tumours to evade detection.

3. Should people stop taking vitamin A supplements?

Not without medical advice. Normal dietary intake is safe, but high-dose supplements may carry risks. Always consult a doctor before changing supplements or treatment plans.

4. What is the new drug KyA33?

KyA33 is an experimental drug that blocks retinoic acid formation.

In mice, it restored immune activity and strengthened cancer vaccine responses — but it has not yet been tested in humans.

5. How does this change cancer treatment research?

The findings explain how tumours exploit vitamin A pathways and open doors to new therapies, including better dendritic cell vaccines and immune-boosting drugs.

Disclaimer: This article, including health and fitness advice, only provides generic information. Don’t treat it as a substitute for qualified medical opinion. Always consult a specialist for specific health diagnosis.