A small organ long thought to become inactive after early adulthood may play a much larger role in health than previously believed. The thymus, located behind the breastbone, is responsible for producing and maturing T cells — a key part of the immune system. New research suggests it may continue influencing disease risk, including cancer and cardiovascular conditions, well into later life.
Scientists found that individuals with better-preserved thymus function responded more effectively to immunotherapy, a treatment that uses the body’s immune system to fight cancer. Those with healthier thymus activity were more likely to experience improved outcomes, highlighting the importance of overall immune function — not just tumor characteristics — when evaluating treatment options.
Lifestyle factors may also influence how quickly the thymus declines. Smoking, obesity, and low physical activity were linked to faster deterioration, which may reduce the body’s ability to generate new immune cells. These findings suggest that maintaining immune health could play a role in disease prevention and may eventually shape how doctors assess risk and personalize treatment strategies.
SOURCE:
Scitech Daily, March 21, 2026