Prophylactic Therapy with Fibrogammin Is Associated with a Decreased Incidence of Bleeding Episodes: A Retrospective Case Control Study.
Abstract In an ongoing Phase III study we are evaluating the prophylactic efficacy and long-term safety of Fibrogammin® P, a purified, pasteurized concentrate of Factor XIII, in patients (pts) with congenital Factor XIII deficiency (an extremely rare, hereditary, life-threatening bleeding disorder). The study is being conducted at 37 sites and has enrolled 61 pts; these 61 represent approximately 2/3 of US patients with FXIII deficiency. For this analysis, a retrospective chart review was undertaken to compare spontaneous bleed-event rates 24 months prior to (when possible) and after the initiation of therapy in a subset of 7 study subjects who did not receive any prophylactic therapy prior to entering the study. The table below presents data for each of these pts on dosing, bleeding episodes and treatment (Rx) during both observation periods (Obs Pd). An additional 4 pts had been treated prophylactically with regular infusions of FFP or cryoprecipitate and transitioned successfully to FXIII therapy; there were no seroconversions to HIV, Hepatitis B/C in any study pts. Pre-Fibrogammin P Therapy On Fibrogammin P Therapy Pt # Age ♦ Obs Pd (mos) / # Bleeds; Bleed Type Rx Obs Pd mos; (# inf) / # bleeds Bleed Type Dose/Kg† ♦ Age at onset of Fibrogammin Prophylactic therapy; † Pts were dosed on a unit basis (1250 unit vials), at 5-wk intervals, variability in weight and vial size lead to a range of per Kg doses; ⋄ p = .01 vs pre-therapy 504 5 yr 24 / 2 Hematomas none 12 (12) / 0 27 2703 10 mo 9 / 2 Umbilical cord; extensive bruising FFP 25 (26) / 1 Head trauma and bruising 29.7 – 44.9 2704 20 mo 6 / 4 Forehead × 2; frenulum × 2; other FFP × 5 26 (26) / 2 Traumatic foot; traumatic head (extracranial) 18.3 – 43.1 2705 9 yr 24 / 3 Lip; ankle; forehead FFP 13 (12) / 0 none 19.9 – 29.7 3301 19 yr 24 / 5 Large hematomas none 9.5 (11) / 0 none 18.9 3302 17 yr 24 / 0 none none 9.5 (12) / 0 none 24.3 3303 14 yr 24 / 8 Intracranial; others × 7 FFP, Cryoppt 10 (11) / 0 none 15.6 Mean 2.5 bleeds/yr 0.2 bleeds/yr⋄ As shown in the table, these children had 2.5 bleeds per year in the period before Fibrogammin prophylaxis, and only 0.2 per year while on Fibrogammin. These results demonstrate a consistent and clinically significant reduction in spontaneous bleeding with prophylactic use of Fibrogammin® P in pts with symptomatic congenital Factor XIII deficiency.