Well as a start you can look at the pipelines on websites of...

Well as a start you can look at the pipelines on websites of Pharma companies with checkpoint inhibitor- BMS, Merck, Roche, Astra, you’ll see numerous trials going on with various combinations with other new and existing drug classes. If you searched clinical trials .gov you’d also find 100s. This is huge field.
there are already approved combinations eg Nivolumab plus ipilimumab.
Nox is just one of very many large Pharma and small biotechs playing in this combination immunotherapy field (and iconic trial isn’t technically Nox’s anyway, it’s investigator initiated I read).