NEJM:镭-223可显著改善骨转移前列腺癌的总生存率

2013-07-25 NEJM dxy

氯化镭-223(镭-223)是一种α射线发射体,可利用α粒子 选择性靶向作用于骨转移灶。来自英国Royal  Marsden医院泌尿科的Parker博士等研究人员对于去势抵抗性前列腺癌和骨转移的患者,在予以最佳标准治疗之外,还评估了镭-223相对于安慰剂 治疗的有效性和安全性。他们发现镭-223可改善总生存率。相关文献发表于国际权威杂志 NEJM 2013年7月份在线版。 在该

氯化镭-223(镭-223)是一种α射线发射体,可利用α粒子 选择性靶向作用于骨转移灶。来自英国Royal  Marsden医院泌尿科的Parker博士等研究人员对于去势抵抗性前列腺癌和骨转移的患者,在予以最佳标准治疗之外,还评估了镭-223相对于安慰剂 治疗的有效性和安全性。他们发现镭-223可改善总生存率。相关文献发表于国际权威杂志 NEJM 2013年7月份在线版。

在该项3期、随机、 双盲、安慰剂对照研究中,研究人员对已经接受、不宜接受或拒绝接受多西他赛治疗的921例患者按2:1的比例进行随机分组,分别接受6次镭-223注射 (剂量为50 kBq/公斤体重,静脉给药)或与之匹配的安慰剂治疗;每4周注射1次。此外,所有患者均接受最佳标准治疗。主要终点是总生存率。主要次要有效性终点包括 首次发生有症状的骨骼事件时间和不同生化指标终点。当出现314例死亡时,研究人员按预先试验设计进行了中期分析,评估了镭-223与安慰剂相比对生存率 的影响。当死亡病例达到528例时,在将治疗从安慰剂交叉至镭-223之前进行了重新分析。

结果发现,对809例患者的中期分析提示,镭-223 与安慰剂相比可显著改善总生存率。包括921例患者的重新分析证实了镭-223的生存裨益。对所有主要次要有效性终点的评估显示了镭-223与安慰剂相比的裨益。镭-223与低骨髓抑制率和较少的不良事件 相关。

这项研究因预先设定的中期分析显示有效而予以终止,并得出结论:镭-223可改善总生存率。

研究背景:超过90%的转移性去势抵抗性前列腺癌患者存在骨转移的放射学证据,骨转移是患者死亡、致残、生活质量下降以及治疗成本上升的主要原因。与其他癌症导致的死亡不同,前列腺癌致死多是由于骨转移及由此带来的并发症。目前的骨靶向治疗并未显示出可改善生存及双磷酸盐、地诺单抗治疗效果的迹象,而现有的放射性同位素治疗的作用也仅仅局限于对疼痛的缓解和骨骼事件的延迟。

镭-223二氯化合物(镭-223)是一种靶向alpha发射体,它可以选择性靶向骨转移患者的骨转换增强的区域,并发射短距离 (<100 μm)高能alpha粒子。作为一种骨亲和性钙仿生剂,镭-223高度靶向新生骨基质,特别是成骨细胞微环境或巩膜转移灶。这种高能alpha粒子放射诱导了大部分双链DNA损伤,并进而导致靶标区域高度局域化的潜在细胞毒性效应。该alpha粒子的短距离路径同样意味着它对邻近健康组织特别是骨髓的毒性作用可达到最小化。

据报道,镭-223在安全性方面表现优异,纳入骨转移患者的1期和2期研究显示,它只伴有最小程度的骨髓毒性。2期研究结果显示,镭-223可减少疼痛并改善疾病相关的生物标志物(如,骨碱性磷酸酶和前列腺癌特异性抗原 [PSA]),同时提示去势抵抗性前列腺癌及骨转移患者有生存获益。为了评估镭-223对患者生存的作用,研究人员展开了一项Alpha-radin用于有症状的前列腺癌患者的3期、随机化、双盲、多中心研究(ALSYMPCA) ,对镭-223相较于安慰剂治疗去势抵抗性前列腺癌和骨转移的有效性和安全性进行了比较。


C. Parker, S. Nilsson, D. Heinrich, S.I. Helle, J.M. O'Sullivan, S.D. Fosså, A. Chodacki, P. Wiechno, J. Logue, M. Seke, A. Widmark, D.C. Johannessen, P. Hoskin, D. Bottomley, N.D. James, A. Solberg, I. Syndikus, J. Kliment, S. Wedel, S. Boehmer, M. Dall'Oglio, L. Franzén, R. Coleman, N.J. Vogelzang, C.G. O'Bryan-Tear, K. Staudacher, J. Garcia-Vargas, M. Shan, Ø.S. Bruland, and O. Sartor for the ALSYMPCA Investigators;Alpha Emitter Radium-223 and Survival in Metastatic Prostate Cancer;N Engl J Med 2013; 369:213-223July 18, 2013DOI: 10.1056/NEJMoa1213755

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    2015-05-25 jasonuclear

    这个研究高大上~~~学习

    0

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    2014-08-29 慈云树

    希望我们能够尽快能够开展镭223治疗

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    2013-10-17 songbq
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    2013-08-08 kljjma

    收到

    0

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    2013-08-07 kljjma

    镭-223可减少疼痛并改善疾病相关的生物标志物

    0

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    2013-08-07 kljjma

    感谢楼主

    0

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