JCO:新药Z-Endoxifen或为难治性乳腺癌患者带来福音

2017-09-04 MedSci MedSci原创

大家都知道Endoxifen是强效抗雌激素的他莫昔芬的有效衍生物,近日在JCO上发表的一篇文章则对Z-endoxifen进行了I期临床试验,以确定其毒性反应、最大耐受剂量(MTD)、药代动力学和临床效果。

大家都知道Endoxifen是强效抗雌激素的他莫昔芬的有效衍生物,近日在JCO上发表的一篇文章则对Z-endoxifen进行了I期临床试验,以确定其毒性反应、最大耐受剂量(MTD)、药代动力学和临床效果。

该研究对象纳入标准包括内分泌难治性、雌激素受体阳性的转移性乳腺癌。该研究应用了加速滴定法,直到出现中度或剂量限制性毒性反应,随后是3+3的涉及和扩展至40、80、100mg/天。对血清肿瘤DNA(循环细胞[cf);所有患者)和活检[160mg/天和扩展]进行测序。

研究结果显示在纳入的41例患者中,38例可评估测定MTD。之前的内分泌治疗方案包括芳香酶抑制剂(n=36)、氟维司群(n=21)和他莫昔芬(n=15)。患者每天接受一次endoxifen,分别有7个剂量水平(20-160mg)。剂量递增停止于160mg/天,这是鉴于MTD的缺失和endoxifen浓度>1900 ng/ml。endoxifen的代谢不受CYP2D6基因型的影响。

其中1例患者(60mg)有1周期剂量限制性毒性反应(肺栓子),总临床受益率(稳定>6个月[n=7])或部分反应率为26.3%(95% CI,13.4%-43.1%),包括之前他莫昔芬(n=3)的进展。在13例患者中观察到cfDNA突变(PIK3CA [n=8]、ESR1[n=5]、TP53[n=4]和AKT[n=1]),与没有cfDNA突变的患者相比,无进展生存期较短(中位,61v132天,P=0.046)。在ESRA扩增(肿瘤;80mg/天)和ESR1突变(cfDNA;160mg/天)的患者中可以看到临床获益。比较了肿瘤活检和cfDNA后,发现一些突变((PIK3CA、TP53、AKT)不能由cfDNA检测到,而cfDNA突变(ESR1、TP53、AKT)不能由活检检测到。

由上述研究可见在内分泌难治性转移性乳腺癌患者中,Z-endoxifen提供了大量不受CYP2D6代谢影响的药物接触,也表现出可接受的毒性反应和很有前景的抗肿瘤活性。

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    2018-07-04 lidong40
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    2017-09-06 freve
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