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Incorporating ulipristal acetate in the care of symptomatic uterine fibroids: a Canadian cost-utility analysis of pharmacotherapy management

Authors Tsoi B, Blackhouse G, Ferrazzi S, Reade CJ, Chen I, Goeree R

Received 25 November 2014

Accepted for publication 3 February 2015

Published 17 April 2015 Volume 2015:7 Pages 213—225

DOI https://doi.org/10.2147/CEOR.S78115

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Dr Giorgio Colombo

Bernice Tsoi,1,2 Gord Blackhouse,1,2 Simon Ferrazzi,3 Clare J Reade,4 Innie Chen,5,6 Ron Goeree1,2,7

1Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, ON, Canada; 2Programs for Assessment of Technology in Health (PATH) Research Institute, St Joseph's Healthcare Hamilton, Hamilton, ON, Canada; 3Independent Consultant, Oakville, ON, Canada; 4Division of Gynecologic Oncology, University of Toronto, Toronto, ON, Canada; 5Department of Obstetrics and Gynaecology, University of Ottawa, 6Ottawa Hospital Research Institute, Ottawa, ON, Canada; 7Centre for Evaluation of Medicines (CEM), St Joseph's Healthcare Hamilton, Hamilton, ON, Canada

Objective: To present a Canadian economic evaluation on the cost-utility of ulipristal acetate (5 mg orally daily) compared to leuprolide acetate (3.75 mg intramuscular monthly) in the treatment of moderate-to-severe symptoms of uterine fibroids in women eligible for surgery.
Methods: A probabilistic decision tree was constructed to model the pre-operative pharmacological management of uterine fibroids under the primary perspective of the Ontario public payer. The model parameterized data from clinical trials, observational studies, and public costing databases. The outcome measure was the incremental cost-utility ratio. Uncertainty in the model was explored through sensitivity and scenario analyses.
Results: Ulipristal was associated with faster control of excessive menstrual bleeding, fewer symptoms of hot flashes and lower health care resource consumption. The ulipristal strategy dominated leuprolide as it provided patients with more quality-adjusted life years (0.177 versus 0.165) at a lower cost ($1,273 versus $1,366). Across a range of sensitivity analyses, the results remained robust except to the dose of the comparator drug. If leuprolide was administered at 11.25 mg, once every 3 months, the expected cost for the leuprolide strategy would decline and the associated incremental cost-utility ratio for ulipristal would be $168/quality-adjusted life year.
Conclusion: Ulipristal offers a unique opportunity to effectively and rapidly control menstrual bleeding in patients with uterine fibroids; thereby improving their quality of life while minimizing the probability of moderate-to-severe hot flashes that are common with leuprolide. The current economic analysis suggests that ulipristal remains the dominant strategy across extensive sensitivity analyses.

Keywords: cost-utility analysis, uterine leiomyomas, preoperative care, decision tree, menorrhagia

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