Confirmed. Pokemon causes cancer.

[Joel Rojo]

Scientists at Memorial Sloan-Kettering Cancer Center (MSKCC) have identified a new cellular oncogene essential for the development of cancer. Oncogenes are genes that, when mutated or dysfunctional, lead normal cells to become cancerous. The investigators have named the gene POKEMON (for POK Erythroid Myeloid Ontogenic factor). The work is being published in the January 20, 2005, issue of Nature.

That last paragraph is a link, btw.