Subcutaneous administration of human C1 inhibitor with recombinant human hyaluronidase in patients with hereditary angioedema

Background:

The currently approved method of C1 inhibitor (C1 INH) administration for patients with hereditary angioedema with C1 INH deficiency (HAE) is by intravenous injection. A C1 INH subcutaneous formulation may provide an attractive mode of administration for some patients.

Objective:

To evaluate efficacy and safety of two doses of subcutaneous, plasma-derived C1 INH with the dispersing agent, recombinant human hyaluronidase (rHuPH20) to prevent angioedema attacks in patients with HAE.

Methods:

A randomized, double-blind, dose-ranging, crossover study, patients ≥ 12 years of age (n = 47) with a confirmed diagnosis of HAE were randomly assigned to receive subcutaneous injections of 1000 U C1 INH with 24,000 U rHuPH20 or 2000 U C1 INH with 48,000 U rHuPH20 every 3 or 4 days for 8 weeks and then crossed-over for another 8-week period. The primary efficacy end point was the number of angioedema attacks during each treatment period.

Results:

The study was terminated early as a precaution related to non-neutralizing antibodies to rHuPH20 in 45% of patients. The mean ± standard deviation number of angioedema attacks during the 8-week treatment periods were 1.58 ± 1.59 with 1000 U C1 INH and 0.97 ± 1.26 with 2000 U. The mean (95% confidence interval [CI]) within-patient difference (2000 U-1000 U, respectively) was −0.61 (95% CI, −1.23 to 0.01) attacks per month (p = 0.0523), and −0.56 (95% CI, −1.06 to −0.05) attacks that required acute treatment, (p = 0.0315). No deaths or other serious adverse events were reported. Injection-site reaction was the most common adverse event.

Conclusion:

Despite early termination, this study demonstrated a clinically and statistically significant difference in burden of disease, which favored 2000 U C1 INH, without associated serious adverse events.