Sorry but his cancer was one only caused by exposure to asbestos and particularly agressive once symptoms became apparent the outcome was inevitable in fact he turned down treatment as it would only have prolonged things a short while.
Hindsight is a wonderful thing I would not change the advise I gave my friend over several years and in the same circumstances I would not hestate to offer advice or guidance to the best of my ability now, no matter how futile it may seem.