What agent to pick after a TNFi has failed: another TNFi or a non-TNFi? Would a TNFi drug conc help (i.e. if low, increased clearance due to secondary failure)? In this RCT @maartenskliniek, this TDM approach was no better than random selection. Argh #ACR24 ABST0533 @RheumNow https://t.co/3h8o4ARZG3