The proportion of CD34–THY1+ fibroblasts comprised a median of 22% of total fibroblasts in RA compared to 8% in OA (odds ratio (OR) = 3 (95% confidence interval (CI): 1.33–6.48), P = 0.007 (Wilcoxon's rank-sum test)). The gene discussed is CD34; the disease is rheumatoid arthritis.