>The risk of childhood leukemia was higher than expected for the distance up to 6 km from the radio station (standardized incidence rate = 2.2, 95% confidence interval: 1.0, 4.1), and there was a significant decline in risk with increasing distance both for male mortality (p = 0.03) and for childhood leukemia (p = 0.036).
There was a lawsuit about it causing leukemia, but it is unclear how substantial that is: https://en.wikipedia.org/wiki/Vatican_Radio_lawsuit