PRTN3 and rheumatoid arthritis: There was no significant difference in serum levels of sTIM-3 (median: 2819 pg/ml vs 2615 pg/ml, P = .26), titers of ACPA (median: 56.4 U/ml vs 60.1 U/ml, P = .82) and titers of RF (median: 64.0 IU/ml vs 30.0 IU/ml, P = .69) between RA patients treated with and without biologics.