JNCI:三种PD-L1免疫组化分析方法对比及与三阴性乳腺癌患者治疗预后的相关性

2021-06-10 MedSci原创 MedSci原创

22C3和SP263检测相比SP142检出的PD-L1阳性率(IC≥1%)更高

在3期IMpassion130研究中,阿特珠单抗联合nab-紫杉醇(A+nP)在PD-L1阳性(肿瘤浸润免疫细胞[IC]≥1%;SP142免疫组化[IHC])晚期/转移性三阴性乳腺癌(TNBC)患者中展现出了临床效益。

本研究旨在评估其他两种PD-L1检测方法是否与SP142和患者相关的临床预后一致。

采用IHC检测了614位患者(68.1%的患者为意向治疗人群)的样本中IC的PD-L1状态(VENTANA SP142、SP263、Dako 22C3)或作为联合阳性评分(CPS;22C3)。

三种检测方法的阳性率

采用SP142、SP263和22C3实验,PD-L1 IC≥1%的概率分别为46.4%(95% CI 42.5–50.4%)、74.9%(71.5-78.3%)和73.1%(69/6-76.6%);80.9%的样本22C3实验的CPS≥1。在IC≥1% (+) 时,SP142 与SP263和22C3的分析一致性分别为 69.2% 和 68.7%。几乎所有 SP142+病例都被其他检测捕获到(双阳性),但是,部分SP263+(29.6%)和22C3+(29.0%)病例在SP142检测中为阴性(单阳性)

SP142+和22C3+患者采用A+nP vs P+nP治疗的PFS和OS

SP142+和SP263+患者采用A+nP vs P+nP治疗的PFS和OS

在SP263+和22C3+患者中,A+nP临床活性对比安慰剂+nP(PFS风险比[HR] 0.64-0.68;总存活率[OS]HR:0.75-0.79)是由双阳性(PFS HR 0.60–0.61; OS HR=0.71–0.75)而非单阳性(PFS HR=0.68–0.81; OS HR=0.87–0.95)驱动的。SP263(IC≥4%)和22C3(CPS≥10)与 SP142 IC≥1% 的协调临界值的一致性低于标准(约75%)。

总之,22C3和SP263检测相比SP142可鉴定出更多的PD-L1阳性(IC≥1%)的患者。未观察到不同检测方法间的分析等效性。在22C3和SP263 PD-L1阳性 (IC≥1%) 人群中,SP142 PD-L1 IC≥1%的患者从A+nP治疗中获得了持续改善的临床效益。

原始出处:

Rugo Hope S,Loi Sherene,Adams Sylvia et al. PD-L1 Immunohistochemistry Assay Comparison in Atezolizumab plus nab-Paclitaxel-Treated Advanced Triple-Negative Breast Cancer.[J] .J Natl Cancer Inst, 2021, https://doi.org/10.1093/jnci/djab108

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    2021-06-12 smartjoy
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    2021-06-12 xlysu
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