GAPDH and rheumatoid arthritis: No change in synovial expression of glyceraldehyde 3-phosphate dehydrogenase (GAPDH) was observed in RA compared to OA in the lining layer (2.1 ± 0.46 OA vs 1.45 ± 0.18 RA) (p = 0.232), sublining layer (1.20 ± 0.33 OA vs 1.44 ± 0.14 RA) (p = 0.388) and peri-vasculature regions (2.30 ± 0.58 OA vs 2.88 ± 0.23 RA) (p = 0.612).