Abstr 0579 Kim & Colleagues examined predictors of Tx change among RA patients w/ TNFi as 1st line biologic agent - Females & GC use more likely to switch agent - Vitamin D use & hx of other immune-mediated diseases (eg. Psoriasis, IBD) less likely to switch #ACR21 @RheumNow https://t.co/FM5mSWmSNA