In a phase 3 randomised controlled trial (RCT) ( n = 205) [ 38 ], there was a borderline significant trend for iv reslizumab 3 mg/kg to improve FEF 25–75 over 16 weeks by 0.233 L/s vs placebo, exceeding the established biological variability in severe asthma of 0.21 L/s [ 39 ] to infer a clinically relevant treatment effect.
1
—
—