Wonder what frequency and power level they used. Since the origional research was in medical, wouldn't think the power levels very high. But then again chemo-theropy uses near-lethal poisons, radiation theropy, and radical surgery, so guess side-effects of the treatments in cancer research isn't of great concern.
Have to do some searching on this. Tend to go with the balanced equation on this stuff, the output equals the input. Since there are always losses and waste in these processes, usually not worth the effort. But here in Florida, we have lots of ocean, and lots of sunlight, both free. So if a good volume is produced, might be worthwile to pursue.