McBio, Neutropenia could be a game stopper if it is severe enough and/or chronic enough. Many RA patients are old and weak, with already weakened immune systems, so I'm sure that there would be a concern about exposing these patients to a long-term therapy that has a 10% neutropenia side effect profile.
What will be an absolute game stopper is the number of agranulocytosis patients found in P3 trials, at least IMO.
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