Myelodysplastic features in juvenile rheumatoid arthritis.

We have attempted to investigate the dysplastic changes in the hematopoietic system associated with juvenile rheumatoid arthritis (JRA) and its relation to disease activity. The peripheral blood smear and bone marrow aspiration samples of 17 JRA patients were investigated and correlations with laboratory parameters of disease activity sought. The age range was 6-16 years and the duration of disease 1.5-108 months. Abnormal finding of the peripheral smear and bone marrow were scored separately. The score of pathological peripheral blood findings correlated significantly with CRP and ferritin (both P <0.05). In the bone marrow specimens marked changes were noted in the myeloid, erythropoietic, and megakaryopoietic series; however, the score of pathological findings did not correlate with laboratory parameters of disease activity (P > 0.05). We suggest that JRA is associated with marked myelodysplastic changes, also manifested in the peripheral blood smear; these changes may well be the consequence of the inflammatory milieu, including cytokines, during active disease.