It matters not one whit how many studies show result X.
I disagree. It might not matter as to result X, but if you're interested in assessing the quality of the research being done *in general*, then it's vital, especially if (like here, and in a whole bunch of pharma cases) you've got a correlation with a vested interest. Peer review does miss things (well-faked data, for instance), so while it's important, what is more important is not just repeatability, but studies *actually being repeated*.
There was an interesting study done (which typically I can't find right now) into microwave techs, which basically found that they only ever have daughters. Ok, so it's not exactly "suppurating pustules", but it's interesting nonetheless.
Even people whose heads are hit by 100 watts of much stronger photons (sunbathers, cowboys), they do just fine.
Skin cancer is really, really nasty. You should have picked a better example.