If TCZ blunts CRP a lot/ESR a fair bit, how can we pick GCA relapses in pts on TCZ? Cool tech (mass spec w tandem mass tag multiplex) on GiACTA samples. Of 344 candidate proteins, guess what ranked highest? Haptoglobin. Let's validate! @MGHrheumatology #ACR20 ABST0513 @RheumNow https://t.co/ErmqZuf2iu