Re-Phyto-Lize the whales

I caught an advertisement in the newspaper this morning talking about marine phytoplankton and how it helped some guy in Alabama beat cancer.



Now I'm no scientist, and if phytoplankton really does cure cancer, that's great. I was doing some research this morning (by "doing research," I mean searching wikipedia) and found that phytoplankton is responsible for most of the oxygen present in the Earth's atmosphere. I also read that krill feed on marine phytoplankton, and most whales' diets exclusively include krill.

So my question is this: if krill eat phytoplankton, and whales eat krill, does that mean that whales don't get cancer?