SERPING1 and hereditary angioedema: In summary, the mean number of HAE attacks per month was significantly lower during treatment with C1‐INH(SC) 60 IU/kg than during treatment with placebo (0.5 vs. 4.0 attacks; within‐patient difference, −3.5; p < 0.001); the median reduction in attack rate was 95% and there was a >99% reduction in the use of rescue medications to treat attacks.