HA!!
I don't know. I'm hearing about WAY more brain tumor cases than ever before, including someone very close to me.
When I was in radio, and we were doing transmitter readings, we were always told to limit our exposure to RF.
Now people are putting RF to their heads. Some of them constantly.
Let's face it -- if there WAS a link, there would be a rather huge lobby devoted to keeping it quiet. It would certainly make for the largest class action suit in world history.