174 Active RA pts not responding to MTX were started on TCZ. High GM-CSF (> 5 ng/ml and > 10 ng/ml) at baseline were the independent predictors of poor response to TCZ at Wk24. high GM-CSF had signif higher DAS28-ESR & cytokine levels at baseline https://t.co/vy7czYwv1Z https://t.co/R2cYdNZ3V0