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CLIN CANCER RES:Toca511应用于患者时具有安全性和活性

2018-10-22 MedSci MedSci原创

Toca 511是编码胞嘧啶脱氨酶的γ逆转录病毒复制载体,可以选择性地感染肿瘤细胞并将5-氟胞嘧啶转化为抗肿瘤的药物5-氟尿嘧啶,5-氟尿嘧啶直接杀死肿瘤细胞并刺激抗肿瘤免疫应答。CLIN CANCER RES近期发表了一篇文章,对复发性高级别胶质瘤的I期临床试验进行临床监测,对患者标本进行了大量的分子分析以了解载体的结局。

Toca 511是编码胞嘧啶脱氨酶的γ逆转录病毒复制载体,可以选择性地感染肿瘤细胞并将5-氟胞嘧啶转化为抗肿瘤的药物5-氟尿嘧啶,5-氟尿嘧啶直接杀死肿瘤细胞并刺激抗肿瘤免疫应答。CLIN CANCER RES近期发表了一篇文章,对复发性高级别胶质瘤的I期临床试验进行临床监测,对患者标本进行了大量的分子分析以了解载体的结局。

三项I期研究共纳入127名高级别胶质瘤患者,患者接受Toca 511和Toca FC(缓释5-氟胞嘧啶)治疗。作者测量了患者体液和肿瘤样品中的Toca 511 RNA和DNA水平以评估肿瘤特异性。绘制了Toca 511整合位点,并对可检测到病毒的患者样本的Toca 511基因组进行了测序。作者还对一例患者的不同组织样本中的Toca 511水平进行了检测。研究结果表明,绝大部分的肿瘤样本中都可以检测到整合的Toca 511,仅在一小部分患者的血液中即时检测到。没有证据表明整合了Toca 511 DNA的细胞出现克隆扩增。Toca 511序列谱表明大多数突变是由逆转录过程的APOBEC胞苷脱氨酶引起的。对于特定患者的不同组织样品的检测确认了Toca 511的肿瘤选择性。

文章最后认为,Toca 511和Toca FC治疗与克隆扩增无关。该载体有肿瘤选择性,患者接受Toca 511注射后持续有效。

原始出处:

Daniel J. HoganJay-Jiguang Zhuet al. Molecular Analyses Support the Safety and Activity of Retroviral Replicating Vector Toca 511 in Patients. CLIN CANCER RES. October 2018 doi: 10.1158/1078-0432.CCR-18-0619 

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    2019-04-25 wangyang7958
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    2019-08-21 smlt2008
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