More Leukemia Cases?

I am trying very hard to stablize my thoughts and worries. I know there's no conclusive evidence and much is being said to mitigate the issue, from the authorities of course. Can I wait for paper evidence or more and more Leukemia cluster before getting really worried? I don't think I am that kind! My collegue mentioned that her friend had been a volunteer worker and there's this particular spot (non-military housing area) has got many more Leukemia kids .. or cancer kids, I am not sure.. perhaps there is a cluster..