From the reading I did, I *could* make a case for CTLA-4. However, it appears that CTLA-4 antagonism upregulates ICOS. So if a cell needs to be responsive to CTLA-4 blockade to upregulate ICOS, then what strong need is there for JNCE's drug? It becomes a small, incremental addition to the response rather than an independent driver for a response.
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