Et klinisk relevant svagt reagerende inhibitor blev fundet hos 1 ud af 65 BeneFIX patienter (heriblandt 9 patienter, som kun deltog i kirurgisk indgreb- studiet), som tidligere havde modtaget plasmafremstillede præparater.
A clinically relevant, low responding inhibitor was detected in 1 out of 65 BeneFIX patients (including 9 patients participating only in the surgery study) who had previously received plasma derived products.