One question that comes to mind concerns timing and circumstance. A recent New York Times article pointed out how cancers occur with alarming frequency in humans, but most of the time they're taken care of by the body's own defenses: antibodies. Could it be that for some subtle, as yet not understood reason, exposure to micowave energy just at the time antibodies set upon a neoplasm inhibits the antibodies' ability to stop neoplastic growth? Could the walls/coatings of either cell type undergo an unhelpful change because of microwave energy?

That's just one question. There are surely others. Then answer, I think, will first be arrived at through statistical data on cell phone users over time. But laboratory studies seem to be in order at some point.

So in a larger sense, what I'm asking is, do we know with perfect certainty that only ionizing radiation plays a role in cancer? I'm not so sure.