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CR Hay, Y Laurian, F Verroust, FE Preston and PB Kernoff
Royal Liverpool Hospital, UK.
Home therapy with porcine factor VIIIC was safe and effective when
administered to five hemophilic patients over periods of 8 1/2, 6, 4, 3
1/2, and 2 years. No significant transfusion reactions occurred. Before
treatment with porcine factor VIIIC, all five had high-level, high-
responding anti-human VIIIC inhibitors initially lacking anti-porcine
factor VIIIC activity. Although specific anti-porcine VIIIC inhibitors
arose in all patients, these were generally transient, and only one patient
became refractory to treatment. We believe that porcine factor VIIIC is the
treatment of choice in patients whose inhibitors do not cross-react. All
five patients lost their original anti-human VIIIC inhibitors after
starting treatment with porcine VIIIC, permitting the reintroduction of
human VIIIC in three of them. There has been no recurrence of anti-human
VIIIC inhibitor activity during 2 to 3 years of regular treatment with
human VIIIC in these patients. This suggests that tolerance to human VIIIC
has arisen as a result of treatment with porcine VIIIC. Porcine VIIIC may
have a role in the desensitization of some factor VIIIC inhibitor patients.
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