[quote=Brian Hill] Genetically it actually changes during treatment, and really isn't the same thing at the end it was at the beginning. Which is why chemo drugs only work in many cancers for a short period of time, then become ineffective. Smart cancer find a different route.... (There are some dumb cancers, but not many) The cancer just begins to work in an alternate way. [/quote]

Wouldn't the smart cancer be the one that DOESN'T kill the host thereby committing suicide itself? Just a thought ...