[mcbain]

They are https://en.m.wikipedia.org/wiki/PD-1_and_PD-L1_inhibitors

The hint is the -mab naming.

[pfdietz]

-ab means it's an antibody. There are many kinds of antibodies, not just to those two proteins.

[semi-extrinsic]

And -mab means monoclonal antibody. But your point still stands, there is a huge number of -mab drugs out there today.

[pfdietz]

It's a really great technology, and not just for drugs. It deservedly won the Nobel Prize in Medicine in 1984.