Absorb or block, Eric. Usually advertised as block. Anyone in your family affected?

Esshup, I'm so very sorry about your Dad. There seems to be a genetic component so you might want to get involved early although so little is known that there's no assurance that preventive measures help. But they certainly won't hurt and are absolutely worth a try.
It's extremely frustrating for patient and doctor as both try hard and watch as the disease progresses. Research is being done but nothing has emerged as a curative treatment. I've read that stem cells show promise but that ship is still far out at sea as are most of the other ships.

Another tidbit: smokers should avoid beta carotine.