1. Novel circulating tumor cell-based blood test for the assessment of PD-L1 protein expression in treatment-naïve, newly diagnosed patients with non-small cell lung cancer
- Author
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Drew Watson, James Lee, Shih-En Chang, Feng-Ming Lin, Rui Mei, Bruce K. Patterson, Yen-Lin Chen, Twinkal Marfatia, Manana Javey, Chia-Hsun Hsieh, Wen-Chien Huang, Ming-Hong Yen, Ruey Kuen Hsieh, Huangpin B. Hsieh, Stephen Su, Padma Sundar, and Kuo-Wei Chen
- Subjects
Adult ,Male ,Oncology ,Cancer Research ,medicine.medical_specialty ,Lung Neoplasms ,Concordance ,Immunology ,Checkpoint inhibitor therapy ,PD-L1 expression ,B7-H1 Antigen ,Circulating tumor cell ,Non-small cell lung cancer ,Carcinoma, Non-Small-Cell Lung ,Cell Line, Tumor ,Internal medicine ,PD-L1 ,Biomarkers, Tumor ,medicine ,Humans ,Immunology and Allergy ,Blood test ,Liquid biopsy ,Lung cancer ,False Negative Reactions ,Lung ,Aged ,Aged, 80 and over ,medicine.diagnostic_test ,biology ,business.industry ,Circulating tumor cells ,Middle Aged ,Neoplastic Cells, Circulating ,medicine.disease ,Immunohistochemistry ,biology.protein ,Feasibility Studies ,Original Article ,Female ,Non small cell ,business - Abstract
We evaluated the analytical and clinical performance of a novel circulating tumor cell (CTC)-based blood test for determination of programmed death ligand 1 (PD-L1) protein expression status in real time in treatment-naïve non-small cell lung cancer (NSCLC) patients. CTCs were detected in 86% of patients with NSCLC (I-IV) at the time of diagnosis, with a 67% PD-L1 positivity rate (≥ 1 PDL + CTC). Among 33 NSCLC patients with PD-L1 results available via both tissue immunohistochemistry (IHC) and CTC assays, 78.9% were positive according to both methods. The CTC test identified an additional ten cases that were positive for PD-L1 expression but that tested negative via IHC analysis. Detection of higher PD-L1 expression on CTCs compared to that in the corresponding tissue was concordant with data obtained using other platforms in previously treated patients. The concordance in PD-L1 expression between tissue and CTCs was approximately 57%, which is higher than that reported by others. In summary, evaluation of PD-L1 protein expression status on CTCs isolated from NSCLC patients is feasible. PD-L1 expression status on CTCs can be determined serially during the disease course, thus overcoming the myriad challenges associated with tissue analysis.
- Published
- 2019
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