Also see:
Stem Cells: Does Their Origin Matter?
http://www.answersingenesis.org/articles/am/v2/n1/stem-cells
Although everyone wants to see such devastating diseases come to an end, we all must realize our work will only lead to a temporary alleviation. Jesus Christ, the true conqueror of disease and death, will create a new heaven and a new earth where the effects of sin have been removed. That is the cure we eagerly await.
I think thats fairly pie in the sky to say, if we don't work to eliminate these diseases they will continue to ravage mankind. God also gave us brains to better understand his works, these diseases are clearly challanges for the human race to overcome and thereby bring us closer to God. The method's we use to conquor these challanges are what will determine if we are succesful.