Having heard several times that checkpoint inhibitors or modulators were the next big thing in cancer prevention, I looked for a background article on them on the Internet. What little there is can be found in professional science/medical journals, behind pay walls, with only the abstract available. So I wrote something up that does not assume you have a PhD in biochemistry:
Checkpoint Inhibitors which is at my main finance & technology site, www.openicon.com. It may be modified over time, which is a reason I am not just simply reposting it here.