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Kalydeco临床未达主要终点,却获FDA专家委员会肯定

2014-10-27 16:52:25 来源:生物谷

2014年10月27日讯 /生物谷BIOON/ --导读:福泰制药(Vertex)近日收获了一个大好消息。尽管囊性纤维化(CF)药物Kalydeco在一项III期临床未达到主要终点,但FDA专家委员会却对该药在携带R117H突变的亚组成人患者群体中的疗效予以了肯定,已建议FDA批准该药。在美国,约有500例携带R117H突变的6岁及以上患者,而Kalydeco的价格高达30万美元/人/年,这意味着如果FDA批准Kalydeco用于该群体,Vertex公司将每年增加1.5亿美元的销售额。

一项在携带R117H突变的囊性纤维化(CF)患者中开展的III期临床研究中,药物Kalydeco未能达到主要终点,令Vertex公司和投资者有些忐忑不安。然而,该药却意外获得了FDA专家委员会的肯定。一个很重要的原因是,在该项研究中,在亚组成人群体(18岁及以上)中,Kalydeco使患者肺功能得到了统计学意义的显著改善,在24周时肺功能平均改善5%。目前,全球大约有1100例患者携带R117H突变,而医生和患者群体普遍迫切希望得到药物治疗,因此,FDA专家委员会认为,批准Kalydeco仍能够解决携带R117H突变CF成人群体中的高度未获满足医疗需求。

本周二,FDA专家委员会以13:2的投票结果,支持批准Kalydeco用于6岁及以上携带R117H突变的囊性纤维化(CF)患者。疗效方面,FDA专家委员会以9:6的投票结果认为,Kalydeco依然能够解决一个高度未获满足的医疗需求。FDA将于2014年12月30日做出最终审查决定。

这对于Vertex来说是一个好兆头,如果FDA最终批准Kalydeco,意味着该公司将获得一笔丰厚的新收入。据估计,在美国,大约有500例携带R117H突变的6岁及以上患者,而Kalydeco价格高达30万美元/人/年,500例患者就意味着每年新增1.5亿美元的销售额。

不过,有分析师认为,这是FDA有意侧重审查Vettex囊性纤维化临床项目下一阶段成果的信号,对该项目总体的积极看法,也为另一种非常重要的组合疗法在2015年的批准添加了好的彩头。这一“重要得多”的组合疗法是Kalydeco+lumacaftor,目前,Vertex公司正在携带F508del突变的囊性纤维化(CF)患者中评价这种二合一药物。根据ISI集团分析师,在全球范围内,携带F508del突变的CF患者超过2.8万例。目前,该组合疗法已在III期临床中取得成功,业内人士预计,Vertex将会在今年晚些时候向FDA提交二合一新药(Kalydeco+lumacaftor)的上市申请。

关于Kalydeco

Kalydeco是首个靶向囊性纤维化(CF)根本病因的药物,于2012年首次获美国和欧盟批准,用于治疗囊性纤维化跨膜电导调节因子(CFTR)基因存在至少单拷贝G551D突变的6岁及以上囊性纤维化(CF)患者,该药可使G551D突变缺陷性CFTR蛋白发挥正常功能。G551D突变是一种最常见的门控突变,该突变损害了ATP介导的通道调节。

此外,FDA于2014年6月批准Kalydeco用于携带9种非G551D门控突变中任意一种突变的6岁及以上CF患者,包括:G178R,S549N,S549R,G551S,G1244E,S1251N,S1255P,G1349D或G970R。

欧盟于2014年8月批准Kalydeco用于携带8种非G551D门控突变中任意一种突变的6岁及以上CF患者,包括:G178R,S549N,S549R,G551S,G1244E,S1251N,S1255P,G1349D。

关于囊性纤维化(CF

囊性纤维化(CF)是由囊性纤维化跨膜电导调节因子(CFTR)基因突变导致CFTR蛋白功能缺陷或缺失所致的罕见遗传性疾病,该病困扰着全球约7万人。CFTR蛋白通常调节细胞膜的离子运输,基因突变能导致蛋白产物功能的破坏或丧失。当细胞膜离子运输被中断,某些器官粘液涂层的粘度将变稠。该病的一个主要特征是呼吸道积聚厚厚的粘液,导致呼吸困难及反复感染。

英文原文:UPDATED: Vertex's Kalydeco scores FDA panel rec in R117H. Are bigger nods next?

Despite falling short of its primary endpoint in a trial to examine its effects in cystic fibrosis patients with the R117H mutation, Vertex's ($VRTX) Kalydeco has scored an FDA advisory committee recommendation for approval in that population. And the way some see it, that's a sign of much, much bigger approvals to come.

On Tuesday, an agency panel voted 13-2 in favor of green-lighting the drug in R117H patients age 6 and older, the Boston-based company said in a statement. While the efficacy vote was closer in light of the trial miss--9 in favor, versus 6 against--Kalydeco still addresses a "high unmet medical need," Deutsche Bank analyst Robyn Karnauskas wrote in an investor note prior to the vote.

"We believe that doctors and patients under 18 years will want the drug," she said, as quoted by The Wall Street Journal's Pharmalot.

It's a good sign for Vertex, which could see a hefty chunk of new revenue if the FDA follows suit; according to the company, about 500 patients in the U.S. age 6 and older have the mutation, and with the drug boasting a $300,000 price tag, that can add up quickly.

But the way Sanford Bernstein analyst Geoff Porges sees it, is a "'soft indicator' for the agency's views of the next phase of Vertex's program," he wrote in an investor note seen by Pharmalot. The firm endorsement suggests "a generally positive view of the program, boding well for the approval of the much more important combination next year."

That "much more important" combo is Kalydeco plus lumacaftor, a duo that Vertex is testing in patients with the F508del mutation. According to ISI Group analyst Mark Schoenebaum, more than 28,000 patients worldwide are affected by F508del; industry watchers expect Vertex to file for that combo with the FDA later this year, he wrote in an investor note.

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