In RA, the ratio of the CD34-THY1+ SF subsets were significantly elevated in states 1 to 3, while most SFs in OA were lining cells (CD34-THY1-), which may verify the results that CD34-THY1+ SFs might be important subsets with pathological behavior in rheumatoid arthritis [5]. This evidence concerns the gene THY1 and rheumatoid arthritis.