CD68 and rheumatoid arthritis: Gerlag et al. and Haringman et al. assessed the response of patients to a group of RA treatments including prednisolone, methotrexate and infliximab, via the measurement of the number of CD68-positive cells in the intimal and sub-lining regions of the synovium, using knee arthroscopy before and two weeks after treatment administration [42,43].