Pharmacoeconomic analysis of recombinant factor VIIa versus APCC in the treatment of minor-to-moderate bleeds in hemophilia patients with inhibitors

ABSTRACT

Objective: To compare the cost-effectiveness of three treatment regimens using recombinant activated Factor VII (rFVIIa), NovoSeven, and activated prothrombin-complex concentrate (APCC), FEIBA VH, for home treatment of minor-to-moderate bleeds in hemophilia patients with inhibitors.

† NovoSeven is a registered trademark of Novo Nordisk A/S, Bagsværd, Denmark

‡ FEIBA VH is a registered trademark of Baxter, Deerfield, Illinois, USA

Methods: A literature-based, decision-analytic model was developed to compare three treatment regimens. The regimens consisting of first-, second-, and third-line treatments were: rFVIIa-rFVIIa-rFVIIa; APCC-rFVIIa-rFVIIa; and APCC-APCC-rFVIIa. Patients not responding to first-line treatment were administered second-line treatment, and those failing second-line received third-line treatment. Using literature and expert opinion, the model structure and base-case inputs were adapted to the US from a previously published analysis. The percentage of evaluable bleeds controlled with rFVIIa and APCC were obtained from published literature. Drug costs (2005 US$) based on average wholesale price were included in the base-case model. Univariate and probabilistic sensitivity analyses (second-order Monte Carlo simulation) were conducted by varying the efficacy, re-bleeding rates, patient weight, and dosing to ascertain robustness of the model.

Results: In the base-case analysis, the average cost per resolved bleed using rFVIIa as first-, second-, and third-line treatment was $28 076. Using APCC as first-line and rFVIIa as second- and third-line treatment resulted in an average cost per resolved bleed of $30 883, whereas the regimen using APCC as first- and second-line, and rFVIIa as third-line treatment was the most expensive, with an average cost per resolved bleed of $32 150. Cost offsets occurred for the rFVIIa-only regimen through avoidance of second and third lines of treatment. In probabilistic sensitivity analyses, the rFVIIa-only strategy was the least expensive strategy more than 68% of the time.

Conclusions: The management of minor-to-moderate bleeds extends beyond the initial line of treatment, and should include the economic impact of re-bleeding and failures over multiple lines of treatment. In the majority of cases, the rFVIIa-only regimen appears to be a less expensive treatment option in inhibitor patients with minor-to-moderate bleeds over three lines of treatment.

Key words: :

• Activated prothrombin complex concentrate
• APCC
• Economic model
• FEIBA
• Hemophilia with inhibitors
• Monte Carlo simulation
• NovoSeven
• Probabilistic sensitivity analysis
• rFVIIa

Notes

* This work was presented as a poster presentation at the XXth International Society for Thrombosis and Haemostasis (ISTH) Congress, August 6–12, 2005, Sydney, Australia

† NovoSeven is a registered trademark of Novo Nordisk A/S, Bagsværd, Denmark

‡ FEIBA VH is a registered trademark of Baxter, Deerfield, Illinois, USA