I don't know specifically about the herbs that this boy was using, but certainly some herbs are just as effective against cancer as pharmaceutical drugs (where do you think most drugs come from?).
If you want a peer-reviewed article, I'd suggest reading this reference: Newman DJ, Cragg GM Natural products as sources of new drugs over the last 25 years. Journal of Natural Products 70, 461-477 (2007)
as well as the references in that article.