I just did a quick literature search and didn't see any published articles on the subject be either of those two. And, frankly, I'm dubious it isn't snakeoil.

I just did a quick literature search and didn't see any published articles on the subject be either of those two. And, frankly, I'm dubious it isn't snakeoil. Perhaps well-intentioned snakeoil. Biologically speaking, the electromagnetic waves would have to discriminate cancer cells from normal cells. Except cancer cells are basically identical to normal cells, with the exception of a handful (of very important) mutations. Otherwise they are fundamentally the same. On a similar and more hopeful tangent, there is "magnetic hyperthermia" which is being developed. Essentially, magnetic nanoparticles are targetted to tumor sites and then subjected to alternating magnetic frequencies. This causes the nanoparticles to heat up and destroy the surrounding area (tumor cell).