There's no sure-fire way to cure this man. Whether you wish to believe it is simply an inevitability of mortality, God's plan, or his own karma, sometimes we simply cannot cure those we wish to save. Surely you, his family, and probably several members here will try, but none of us can promise that this will cure him once and for all.
With that out of the way, I'm certainly willing to try. I personally suggest trying to get a Chinese hulu gourd bottle (http://colinjong.com/wp-content/uploads/2009/11/bottled_water_02.jpg ) as it is a very proven healing talisman.
I would also like to pray for this man; if possible I would like his first name (no need for the whole name), a rough description of what he looks like, and the city he currently resides in so that I may face him. If there are any stipulations (like if you REALLY don't think he'd appreciate me using Muslim prayers) please let me know. I work with many faiths and I'm sure I can find a form of prayer agreeable to him.
I've also had extremely good results with a medicine blessing written by Silver Ravenwolf of all people. If you are interested I will PM it to you - I don't really want to post it here because of that whole copyright issue.