FUTURE-2: Results from an open-label, long-term safety and tolerability extension study using the pediatric FormUlation of bosenTan in pUlmonary arterial hypeRtEnsion

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• 作者：Rolf M.F. Berger^a ; ^{r.m.f.berger@umcg.nl" class="auth_mail" title="E-mail the corresponding author} ; Sheila G. Haworth^b ; Damien Bonnet^c ; Yves Dulac^d ; Alain Fraisse^e ; Nazzareno Galiè ; ^f ; D. Dunbar Ivy^g ; Xavier Jaï ; s^h ; Oliver Mieraⁱ ; Erika B. Rosenzweig^j ; Michela Efficace^k ; Andjela Kusic-Pajic^l ; Maurice Beghetti^m
• 关键词：Bosentan ; Pediatric ; Pulmonary arterial hypertension ; Safety
• 刊名：International Journal of Cardiology
• 出版年：2016
• 出版时间：1 January 2016
• 年：2016
• 卷：202
• 期：Complete
• 页码：52-58
• 全文大小：438 K

文摘

A novel formulation of bosentan was evaluated in children with pulmonary arterial hypertension (PAH) in FUTURE-1, which characterized its pharmacokinetic and clinical profile. The subsequent phase III, open-label, long-term extension study, FUTURE-2, aimed to provide long-term tolerability, safety and exploratory efficacy data.

Methods

Children (≥ 2 and < 12 years) with idiopathic or heritable PAH, who completed 12-week treatment in FUTURE-1 and for whom bosentan was considered beneficial were enrolled, and continued to receive bosentan 4 mg/kg twice-daily, which could be down-titrated to 2 mg/kg if not tolerated. Safety and tolerability were evaluated via treatment-emergent adverse events (AEs), serious AEs, growth, and laboratory measurements. Exploratory efficacy endpoints included time to PAH worsening and long-term survival. All analyses were conducted on pooled data of both studies.

Results

36 patients were enrolled in FUTURE-1 and 33 continued in FUTURE-2. The overall median duration of exposure to bosentan was 27.7 (range 1.9–59.6) months. Treatment-emergent AEs occurred in 32 (88.9%) patients; AEs considered treatment-related in 15 (41.7%) patients. Of 51 serious AEs, three were considered treatment-related: two incidences of reported PAH worsening and one of autoimmune hepatitis. Six deaths occurred; none were considered treatment-related. Kaplan–Meier event-free estimates of PAH worsening were 78.9% and 73.6% at 2 and 4 years, respectively.

Conclusions

The pediatric bosentan formulation was generally well tolerated, its safety profile comparable to that of the adult formulation when used in children. The results are in line with the efficacy profile of bosentan in previous pediatric and adult PAH studies of shorter duration.