Retrospective study of 170 #RA on TNFi (Inflx 53%, ADA 28%, CZP 19%). RF, CCP, Drug levels, anti-Drug Abs done.@6 mos HI baseline RF linked to lower drug levels for IFX & ADA; but not CZP. IFX/ADA Hi-RF pts had more dropouts vs CZP (80%/75%/33%, p=0.002) https://t.co/AIgJNkzcWu https://t.co/pQmfmLoFwe