Evaluation of Effectiveness of Two Dosing Regimens of Fostamatinib Compared to Placebo in Patients With Rheumatoid Arthritis (RA) Who Are Taking Methotrexate But Not Responding.

ACR20: American College of Rheumatology 20% response criteria, based on count of swollen and tender joints (out of 28 joints), blood test measures of inflammation (such as CRP) and the physician and patient's own assessments of disease activity, pain and physical function. Non-responder imputation has been applied by carrying the baseline observation forward. BID=twice daily, CRP=C-reactive protein, DMARD=Disease-modifying anti-rheumatic drug, PO=orally.

ACR50: American College of Rheumatology 50% response criteria, based on count of swollen and tender joints (out of 28 joints), blood test measures of inflammation (such as CRP) and the physician and patient's own assessments of disease activity, pain and physical function. Non-responder imputation has been applied by carrying the baseline observation forward. BID=twice daily, CRP=C-reactive protein, DMARD=Disease-modifying anti-rheumatic drug, PO=orally, QD=once a day.

ACR70: American College of Rheumatology 70% response criteria, based on count of swollen and tender joints (out of 28 joints), blood test measures of inflammation (such as CRP) and the physician and patient's own assessments of disease activity, pain and physical function. Non-responder imputation has been applied by carrying the baseline observation forward. BID=twice daily, CRP=C-reactive protein, DMARD=Disease-modifying anti-rheumatic drug, PO=orally, QD=once a day.

ACRn: American College of Rheumatology index of RA improvement, based on smallest percentage improvement in the count of swollen joints (out of 28 joints), count of tender joints (out of 28 joints), or in blood test measures of inflammation (such as CRP) or the physician or patient's own assessments of disease activity, pain and physical function. Scores are reported as a percentage improvement on a scale of -100 to +100, with larger values representing a better clinical outcome. BID=twice daily, CI=confidence interval, CRP=C-reactive protein, DMARD=Disease-modifying anti-rheumatic drug, PO=orally, QD=once a day, RA=rheumatoid arthritis. Mean refers to change at Week 24.

DAS28-CRP: Disease Activity Score based on a count of swollen and tender joints (out of 28 joints), blood test measures of inflammation (CRP) and the patient's own assessment. Scores can take any positive value with a lower value indicating a better clinical condition. A DAS28-CRP score of <2.6 is indicative of remission of RA symptoms. BID=twice daily, CRP=C-reactive protein, DMARD=Disease-modifying anti-rheumatic drug, OR=odds ratio, PO=orally, QD=once a day.

DAS28-CRP: Disease Activity Score based on a count of swollen and tender joints (out of 28 joints), blood test measures of inflammation (CRP) and the patient's own assessment. Scores can take any positive value with a lower value indicating a better clinical condition. A DAS28-CRP score of <2.6 is indicative of remission of RA symptoms. BID=twice daily, CRP=C-reactive protein, DMARD=Disease-modifying anti-rheumatic drug, OR=odds ratio, PO=orally, QD=once a day.

Change in DAS28 was derived for each post baseline scheduled assessment and categorised using the European League Against Rheumatism (EULAR) response criteria. Non-responder imputation has been applied by carrying the baseline observation forward. BID=twice daily, CRP=C-reactive protein, DAS28=Disease Activity Score based on a 28-joint count, DMARD=disease-modifying anti-rheumatic drug, OR=odds ratio, PO=orally, QD=once a day.

HAQ-DI: Health Assessment Questionnaire - Disability Index, a measure of physical function. The HAQ-DI score is calculated by summing scores from 8 sub-categories (ie, scores for patient ability in dressing and grooming, rising, eating, walking, hygiene, reach, grip and common daily activities) and dividing by the number of categories completed. The HAQ-DI score takes values between 0 and 3, with higher score indicating greater disability. HAQ-DI response: a reduction from baseline in HAQ-DI greater than or equal to the minimally important difference (0.22). BID=twice daily, DMARD=disease-modifying anti-rheumatic drug, OR=odds ratio, PO=orally, QD=once a day.

SF-36: 36 item Short Form Health Survey, a measure of health-related QoL. Scores for 8 sub-domains (Physical Functioning, Role-physical, Bodily Pain, General Health, Vitality, Social Function, Role-emotional \& Mental Health) are derived \& normalised to a scale of 0-100. Physical Component Scores (PCS) are derived by multiplying each of these 8 scores by a constant, summing them \& standardising against a population with mean of 50, standard deviation of 10. Higher scores represent a better QoL. Mean changes from baseline score are presented at each visit as increases from baseline (defined as post-baseline minus baseline); larger changes indicate a better clinical condition. ANCOVA=analysis of covariance, BID=twice daily, DMARD=disease modifying antirheumatic drug, PO=orally, QD=once daily, QoL=quality of life.

SF-36: 36 item Short Form Health Survey, a measure of health-related QoL. Scores for 8 sub-domains (Physical Functioning, Role-physical, Bodily Pain, General Health, Vitality, Social Function, Role-emotional \& Mental Health) are derived \& normalised to a scale of 0-100. Mental Component Scores (MCS) are derived by multiplying each of these 8 scores by a constant, summing them \& standardising against a population with mean of 50, standard deviation of 10. Higher scores represent a better QoL. Mean changes from baseline score are presented at each visit as increases from baseline (defined as post-baseline minus baseline); larger changes indicate a better clinical condition. ANCOVA=analysis of covariance, BID=twice daily, DMARD=disease modifying antirheumatic drug, PO=orally, QD=once daily, QoL=quality of life.