Clin cancer research:多参数MR-RET成像可预测复发性高级别神经胶质瘤对GDC-0084治疗的反应性

2020-07-03 QQY MedSci原创

GDC-0084是一种 PI3K/AKT/mTOR信号通路小分子抑制剂,为治疗多形性成胶质细胞瘤 (GBM) 而开发,通过影像学检查是否可评估GBM患者对GDC-0084治疗的反应性?

背景:GDC-0084是一种口服的可通过血脑屏障的PI3K/mTOR小分子抑制剂。鉴于这两个靶点可分别改变肿瘤的血管和代谢,Benjamin M. Ellingson等人推测多参数MR-PET可用于量化GDC-0084用于复发性恶性神经胶质瘤的治疗反应,评估其药代(PK)参数,预测无进展存活期(PFS)。

方法:对GDC-0084 (NCT01547546)的I期试验的47位复发性恶性神经胶质瘤患者进行多参数高级MR-PET成像,评估患者采用GDC-0084治疗的反应。

结果:测得的最大浓度(Cmax)与肿瘤增强信号体积减少(P =0.0287)和分数各向异性增加有关 (FA; P = 0.0418)。治疗后肿瘤体积、18F-FDG 摄取、Ktrans和相对脑血液量(rCBV)均与Cmax相关。18F-FDG PET摄取、表观扩散系数(ADC)、FA、Ktrans、vp和rCBV变化的线性组合能够预估Cmax(R2=0.4113; P<0.0001)和药物暴露 (AUC; R2=0.3481; P<0.0001)。使用此复合多参数MR-PET成像反应生物标记物预测PK,预估Cmax>0.1 μmol/L和AUC>1.25 μmol/L*小时的患者的PFS明显长于低预计浓度和暴露的患者(p值分别是0.0039和0.0296)。

结论:该研究结果表明,通过多参数MR-PET成像创建的针对药物作用机制的代谢和/或生理过程的复合生物标志物,可能有助于更大规模的II-III期试验的疗效评估。

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    2020-12-23 ysjykql
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