重磅!强生Zytiga霸主地位不保,安斯泰来前列腺癌药物Xtandi拿下欧美2大市场

2014-12-04 佚名 生物谷

安斯泰来(Astellas)和Medivation合作研发的新一代前列腺癌口服药物Xtandi(enzalutamide)监管方面爆出大好消息。继今年9月FDA批准Xtandi用于前列腺癌化疗前治疗,近日欧盟也已批准Xtandi用于化疗前治疗。尽管强生(JNJ)新一代前列腺癌口服药物Zytiga早在2011年4月上市之后一直统治市场,但Xtandi具有单独用药的独特优势,业界预测,在欧美2大主要市

安斯泰来(Astellas)和Medivation合作研发的新一代前列腺癌口服药物Xtandi(enzalutamide)监管方面爆出大好消息。继今年9月FDA批准Xtandi用于前列腺癌化疗前治疗,近日欧盟也已批准Xtandi用于化疗前治疗。尽管强生(JNJ)新一代前列腺癌口服药物Zytiga早在2011年4月上市之后一直统治市场,但Xtandi具有单独用药的独特优势,业界预测,在欧美2大主要市场,Xtandi将颠覆Zytiga的霸主地位。

具体而言,欧盟已批准Xtandi用于雄激素剥夺疗法治疗失败但尚未接受化疗(即化疗初治)的无症状或轻微症状的转移性去势抵抗前列腺癌(mCRPC)成人患者的治疗。Xtandi的获批,是基于III期PREVAIL研究的总生存期(OS)积极数据。数据显示,与安慰剂相比,Xtandi使放射学恶化或死亡风险降低81%,使死亡风险降低29%,同时也显著延迟了首次化疗时间(28.0个月 vs 10.8个月)以及首次骨骼相关事件(SRE)的发生。今年9月,FDA批准Xtandi化疗前治疗适应症也是基于III期PREVAIL的积极数据。

分析师预计,鉴于这些结果以及化疗前治疗标签扩展,Xtandi的患者群体将显著扩张,Xtandi的临床用药时间将翻番,化疗前治疗的患者群体将翻3倍。Xtandi于2013年上市,比强生Zytiga晚了近一年半,但Xtandi有其独特优势,即可单独用药,而强生Zytiga需联合强的松(prednisone)用药。

强生Zytiga已收获的化疗前用药适应症,已助推该药在2014年上半年销售额达到10.7亿美元。然而,Xtandi自一上市便被临床医生快速采纳,作为前列腺癌化疗后治疗的首选药物。业界认为,鉴于Xtandi的单独用药优势及近期获批的化疗前适应症,该药有望颠覆Zytiga的霸主地位。

Xtandi(enzalutamide)是一种新颖的、每日一次的口服雄激素受体信号传导抑制剂,该药能够抑制雄激素受体信号传导通路中的多个步骤,旨在干扰睾酮结合前列腺癌细胞的能力,已被证明能够降低癌细胞的生长,并能诱导肿瘤细胞死亡。睾酮是一种男性激素,能够激化前列腺癌细胞的生长。

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    2015-06-15 lingaifan
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    2014-12-06 yibei
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