It's not a debunking book. It doesn't even address alternative treatments at all. It is a kind of biography of cancer.
I think it can help because it puts faces to some of the people who have developed cancer treatments over the years. And it really demystifies the work pharmaceutical researches have done to develop chemotherapy.
Here's the link without the affiliate code:
Highly recommended reading, BTW, though it's a bit depressing.
For the average to go up only four months either we're doing really well against a tiny percentage of cancers or we're doing generally a tiny bit better against most cancers. Or some combination of the two. Either way you look at it that's an indication of lack of progress.