Ann Oncol:apalutamide治疗去势耐受前列腺癌时,雄激素受体基因突变较少

2017-08-28 MedSci MedSci原创

背景:雄激素受体(AR)的配体结合域(LBD)的基因突变,如F877l和T878A,已被证实能抑制下一代AR定向疗法。ARN-509-001是一项I/II期研究,该研究主要评估在去势耐受前列腺癌(castration-resistant prostate cancer,CRPC)中apalutamide的活性。apalutamide是一种竞争性雄激素受体抑制剂。本研究中,研究人员评估了apalut

背景:雄激素受体(AR)的配体结合域(LBD)的基因突变,如F877l和T878A,已被证实能抑制下一代AR定向疗法。ARN-509-001是一项I/II期研究,该研究主要评估在去势耐受前列腺癌(castration-resistant prostate cancer,CRPC)中apalutamide的活性。apalutamide是一种竞争性雄激素受体抑制剂。

本研究中,研究人员评估了apalutamide治疗的CRPC患者的11个AB-LBD相关的基因突变的类型和数量。

方法:基于ARN-509-001研究,研究人员纳入了接受醋酸阿比特龙联合泼尼松(AAP)治疗(暴露≥6个月)前/后的非转移性CRPC(nmCRPC)和转移性CRPC(mCRPC)男性的血液样本,并评估了基线和疾病进展时的数据情况。研究人员使用数字聚合酶链反应的方法如BEAMing(Sysmex inostics公司),在循环肿瘤DNA中检测基因突变。

结果:研究共纳入了97例患者,51例患有nmCRPC,25例患有mCRPC且未接受AAP治疗,21例患有mCRPC且曾接受过AAP治疗。研究人员在基线时,评估了93例患者的基因突变,在其中82例的进展期评估了其基因突变。

基线检测到的AR基因突变频率为7/93(7.5%),进展期为6/82(7.3%)。82例患者中的3例(3.7%)(两例未接受AAP治疗,1例为AAP治疗后)为AR F877l。在基线时,93例患者中的3例(3.2%)AAP治疗后的患者检测出了AR T878A,该突变在1例患者中持续到apalutamide治疗(治疗持续了12个月)结束后。

结论:使用敏感性BEAMing分析在基线和进展期检测到的突变的整体频率(7.5%和7.3%)均较低,这表明,基于这种方法,AR-LBD突变,如F877l和T878A不是apalutamide的耐药性的主要原因。

原始出处:

Rathkopf DE, Smith MR,et al.Androgen receptor mutations in patients with castration-resistant prostate cancer treated with apalutamide.Ann Oncol. 2017 Jun 15. doi: 10.1093/annonc/mdx283. [Epub ahead of print]

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