borderline significantp = 0.049
Reverse MR analyses were also performed to examine if BC influences CD40/CD40L levels.A borderline significant association was found between CD40 levels and overall BC risk (IVW OR 1.027, 95% CI 1.000–1.054, p = 0.049), with a more robust association observed for ER-positive BC (OR 1.048, 95% CI 1.016–1.082, p = 0.003).