I'm not against it, I just find his predictions to be so optimistic as to be unrealistic.
Cancer is, effectively, a form of aging, which is why it's so damn hard to cure. Fortunately, it's what happens when one cell breaks down. Most other aging happens to all your cells, all at once.
De Grey's research is aimed at preventing cancer, not curing it. De Grey names his efforts "engineered negligible senescence". Senescence means the increase in your probability of developing a deadly disease within the next N years as you grow older. The probability of developing most cancers increases rapidly with age. The aim is to prevent that increase.
Cancer is, effectively, a form of aging, which is why it's so damn hard to cure. Fortunately, it's what happens when one cell breaks down. Most other aging happens to all your cells, all at once.