Disease characteristics in high versus low titers of rheumatoid factor or anti-citrullinated peptide antibody in rheumatoid arthritis patients

Abstract

Aim of the workTo evaluate the impact of the level of rheumatoid factor (RF) or anti-citrullinated peptide antibody (ACPA) positivity on the clinical manifestations, disease activity, functional status, and treatment strategy among rheumatoid arthritis (RA) patients. Patients and methodsIn this study, 120 consecutive RA patients were grouped according to the level of RF or ACPA positivity. Group 1: patients with low positive RF or ACPA and Group 2: those with high titer. Disease activity score (DAS28) and functional status using modified health assessment questionnaire (MHAQ) were assessed ResultsThe patients mean age was 46.9 ± 10.9 years and female to male ratio was 7:1. 44 (36.7%) patients had low positive RF/ACPA titers, 59 (49.2%) had high titers and 17 (14.2%) had negative RF/ACPA and were excluded. Patients' global assessment of disease activity was significantly higher among patients with high RF/ACPA titer compared to those with low titer (p = 0.04) and MHAQ tended to be higher (p = 0.058). Subcutaneous nodules (p = 0.037) were more frequent among those with high RF/ACPA titer. The cumulative (p = 0.012) and the current (p = 0.006) steroid doses administered both turned out to be significantly higher in the high positive RF/ACPA patient group. ConclusionPatients with high titer RF and\\or ACPA have factors that may contribute to poor outcome as the presence of reduced functional status which indicated by the higher MHAQ score, the need for higher daily and cumulative steroid doses as an indirect indicator of increased disease activity and in turn poor outcome.