Thymus Gland Health May Be Key to Long Life and Fighting Cancer

New AI research finds adults with healthy, active thymus live longer and better fight off cancer and heart disease.

Mar. 19, 2026 at 7:00pm

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Researchers from Mass General Brigham in Boston used artificial intelligence (AI) to analyze more than 27,000 medical scans and discovered that adults with a healthy, active thymus live longer and are significantly better at fighting off cancer and heart disease. The thymus serves as a training camp for T-cells, the elite soldiers of the immune system that identify and destroy infections and rogue cancer cells. While the organ naturally shrinks as people age, the study found that the character and speed of this shrinking process vary widely between people.

Why it matters

This research could change how doctors predict a patient's long-term health, as the thymus has been overlooked for decades and may be a missing piece in explaining why people age differently and why cancer treatments fail in some patients. Improving the understanding and monitoring of thymic health could eventually help physicians better assess disease risk and guide treatment decisions.

The details

Using medical scans, the AI model analyzed the size and composition of the thymus to give patients a thymic health score. It found that people with high, healthy thymic scores showed a 50% lower risk of dying prematurely from any cause, a 63% lower risk of death from heart-related issues, and a 36% lower risk of developing lung cancer. The benefits extended to cancer patients receiving immunotherapy, as those with a robust thymus had a 37% lower risk of their cancer getting worse and a 44% lower risk of death.

  • The findings were published on March 18, 2026 in two studies in the journal Nature.
  • The research was conducted using data collected during the National Lung Screening Trial and participants in the ongoing Framingham Heart Study.

The players

Mass General Brigham

A healthcare system in Boston, Massachusetts that conducted the research using artificial intelligence.

Hugo Aerts

The director of the Artificial Intelligence in Medicine Program at Mass General Brigham.

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What they’re saying

“The thymus has been overlooked for decades and may be a missing piece in explaining why people age differently, and why cancer treatments fail in some patients.”

— Hugo Aerts, Director of the Artificial Intelligence in Medicine Program at Mass General Brigham

“Improving our understanding and monitoring of thymic health could eventually help physicians better assess disease risk and guide treatment decisions.”

— Hugo Aerts, Director of the Artificial Intelligence in Medicine Program at Mass General Brigham

What’s next

Researchers noted that their findings need to be confirmed in future studies. They also propose looking at whether changing lifestyle factors might improve thymic function and if therapies like radiation might affect the thymus health.

The takeaway

This research highlights the importance of the overlooked thymus gland in aging and fighting diseases like cancer. By better understanding and monitoring thymic health, doctors may be able to more accurately predict patient outcomes and guide treatment decisions in the future.