Improved pain, physical functioning and health status in patients with rheumatoid arthritis treated with CP-690,550, an orally active Janus kinase (JAK) inhibitor: results from a randomised, double-blind, placebo-controlled trial.
OBJECTIVE
To determine the efficacy of CP-690,550 in improving pain, function and health status in patients with moderate to severe active rheumatoid arthritis (RA) and an inadequate response to methotrexate or a tumour necrosis factor alpha inhibitor.


METHODS
Patients were randomised equally to placebo, CP-690,550 5, 15 or 30 mg twice daily for 6 weeks, with 6 weeks' follow-up. The patient's assessment of arthritis pain (pain), patient's assessment of disease activity, Health Assessment Questionnaire-Disability Index (HAQ-DI) and Short Form-36 (SF-36) were recorded.


RESULTS
At week 6, significantly more patients in the CP-690,550 5, 15 and 30 mg twice-daily groups experienced a 50% improvement in pain compared with placebo (44%, 66%, 78% and 14%, respectively), clinically meaningful reductions in HAQ-DI (> or =0.3 units) (57%, 75%, 76% and 36%, respectively) and clinically meaningful improvements in SF-36 domains and physical and mental components.


CONCLUSIONS
CP-690,550 was efficacious in improving the pain, function and health status of patients with RA, from week 1 to week 6.
Coombs
J H
JH
Pfizer Inc, Ann Arbor, Michigan, USA.
Bloom
B J
BJ
Breedveld
F C
FC
Fletcher
M P
MP
Gruben
D
D
Kremer
J M
JM
Burgos-Vargas
R
R
Wilkinson
B
B
Zerbini
C A F
CA
Zwillich
S H
SH
D018501:Antirheumatic Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D001172:Arthritis, Rheumatoid / Q000150:complications / Q000188:drug therapy* / Q000503:physiopathology; D004305:Dose-Response Relationship, Drug; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D053616:Janus Kinase 3 / Q000037:antagonists & inhibitors*; D008297:Male; D008875:Middle Aged; D010146:Pain / Q000188:drug therapy / Q000209:etiology; D010147:Pain Measurement; D010880:Piperidines; D047428:Protein Kinase Inhibitors / Q000008:administration & dosage / Q000627:therapeutic use*; D011743:Pyrimidines / Q000008:administration & dosage / Q000627:therapeutic use*; D011758:Pyrroles / Q000008:administration & dosage / Q000627:therapeutic use*; D020127:Recovery of Function; D016896:Treatment Outcome
D018501:Antirheumatic Agents; D010880:Piperidines; D047428:Protein Kinase Inhibitors; D011743:Pyrimidines; D011758:Pyrroles; C479163:tofacitinib; C507933:JAK3 protein, human; D053616:Janus Kinase 3