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A Healthy Thymus May Mean Greater Longevity
Two new studies overturn the long‑held belief that the thymus becomes irrelevant after childhood. Using AI to analyze thousands of CT scans, researchers found that adults with a healthier-looking thymus live longer and have lower risks of cardiovascular disease and cancer. In cancer patients, better thymic health was also linked to stronger responses to immunotherapy.
The thymus, which trains T cells, was thought to decline in importance with age because it shrinks and produces fewer new immune cells. However, across large populations (over 25,000 people), researchers showed that higher “thymic health” scores were associated with about 50% lower risk of early death, 63% lower cardiovascular mortality, and 36% lower lung cancer risk—independent of age and other factors. Poor thymic health was tied to smoking, obesity, chronic inflammation, and metabolic syndrome, suggesting lifestyle and systemic health influence immune resilience.
In a separate analysis of cancer patients receiving immunotherapy, those with better thymic health had significantly lower risks of disease progression (−37%) and death (−44%). This likely reflects stronger T-cell production and diversity, which are critical for effective immune responses.
Overall, the findings suggest the thymus plays an important role in adult immunity, aging, and cancer outcomes. While not yet ready for clinical use, thymic imaging could eventually help predict disease risk and guide personalized treatments.
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