Database: Ovid MEDLINE(R) 1950 to March Week 2 2007

1 exp arthritis, rheumatoid/ (82649) 2 (arthritis adj2 rheumat$).tw. (51835) 3 (felty$ adj2 syndrome).tw. (604) 4 (caplan$ adj2 syndrome).tw. (100) 5 rheumatoid nodule.tw. (179) 6 (sjogren$ adj2 syndrome).tw. (7824) 7 still$ disease.tw. (1027) 8 (spondylitis adj2 ankylosing).tw. (5833) 9 or/1‐8 (94331) 10 exp Immunoconjugates/tu (1645) 11 exp Antigens, Differentiation/tu (524) 12 abatacept.tw. (48) 13 abatacept.rn. (1547) 14 orencia.tw. (5) 15 ctla4Ig.tw. (342) 16 CTLA‐4IG.tw. (78) 17 CTLA4‐Ig.tw. (256) 18 or/10‐17 (3696) 19 clinical trial.pt. (433538) 20 randomized.ab. (146315) 21 placebo.ab. (97069) 22 dt.fs. (1154061) 23 clinical trials/ (130516) 24 randomly.ab. (107387) 25 trial.ti. (65869) 26 groups.ab. (763970) 27 or/19‐26 (2143950) 28 animals/ (4012600) 29 humans/ (9623654) 30 28 and 29 (964920) 31 28 not 30 (3047680) 32 27 not 30 (2026221) 33 9 and 18 and 32 (89)