According to Anime News Network:
Scientists at Memorial Sloan-Kettering Cancer Center (MSKCC) have
identified a new gene that, when aberrant, can cause cancer. They've named the
gene POKEMON or POK Erythroid Myeloid Ontogenic factor. Details about the
cancer-causing Pokemon gene can be read on the MSKCC website or in the
January 20th issue of Nature magazine.
The really funny thing is that in the whole article, the researchers never mention the Pokemon anime (at least not that I could see). I'm not sure if the researchers just don't know about the show and the name is just a coincidence (not likely) or if they are just trying to keep a professional tone.
Of course, now that people will be saying that Pokemon causes cancer, it makes that whole seizure-causing episode seem like not such a big deal.