Association of Circulating Tumor DNA Testing Before Tissue Diagnosis With Time to Treatment Among Patients With Suspected Advanced Lung Cancer
Authors: García-Pardo Miguel , Czarnecka-Kujawa Kasia , Law Jennifer H. , Salvarrey Alexandra M. , Fernandes Roxanne , Fan Zhen J. , Waddell Thomas K. , Yasufuku Kazuhiro , Liu Geoffrey , Donahoe Laura L. , Pierre Andrew , Le Lisa W. , Gunasegaran Tharsiga , Ghumman Noor , Shepherd Frances A. , Bradbury Penelope A. , Sacher Adrian G. , Schmid Sabine , Corke Lucy , Feng Jamie , Stockley Tracy , Pal Prodipto , Rogalla Patrik , Pipinikas Christodoulos , Howarth Karen , Ambasager Bana , Mezquita Laura , Tsao Ming S. , Leighl Natasha B. 
Published: July 2023

Importance

Liquid biopsy has emerged as a complement to tumor tissue profiling for advanced non–small cell lung cancer (NSCLC). The optimal way to integrate liquid biopsy into the diagnostic algorithm for patients with newly diagnosed advanced NSCLC remains unclear.

Objective

To evaluate the use of circulating tumor DNA (ctDNA) genotyping before tissue diagnosis among patients with suspected advanced NSCLC and its association with time to treatment.

Design, Setting, and Participants

This single-group nonrandomized clinical trial was conducted among 150 patients at the Princess Margaret Cancer Centre–University Health Network (Toronto, Ontario, Canada) between July 1, 2021, and November 30, 2022. Patients referred for investigation and diagnosis of lung cancer were eligible if they had radiologic evidence of advanced lung cancer prior to a tissue diagnosis.

Interventions

Patients underwent plasma ctDNA testing with a next-generation sequencing (NGS) assay before lung cancer diagnosis. Diagnostic biopsy and tissue NGS were performed per standard of care.

Main Outcome and Measures

The primary end point was time from referral to treatment initiation among patients with advanced nonsquamous NSCLC using ctDNA testing before diagnosis (ACCELERATE [Accelerating Lung Cancer Diagnosis Through Liquid Biopsy] cohort). This cohort was compared with a reference cohort using standard tissue genotyping after tissue diagnosis.

Results

Of the 150 patients (median age at diagnosis, 68 years [range, 33-91 years]; 80 men [53%]) enrolled, 90 (60%) had advanced nonsquamous NSCLC. The median time to treatment was 39 days (IQR, 27-52 days) for the ACCELERATE cohort vs 62 days (IQR, 44-82 days) for the reference cohort (P &amp;lt; .001). Among the ACCELERATE cohort, the median turnaround time from sample collection to genotyping results was 7 days (IQR, 6-9 days) for plasma and 23 days (IQR, 18-28 days) for tissue NGS (P &amp;lt; .001). Of the 90 patients with advanced nonsquamous NSCLC, 21 (23%) started targeted therapy before tissue NGS results were available, and 11 (12%) had actionable alterations identified only through plasma testing.

Conclusions and Relevance

This nonrandomized clinical trial found that the use of plasma ctDNA genotyping before tissue diagnosis among patients with suspected advanced NSCLC was associated with accelerated time to treatment compared with a reference cohort undergoing standard tissue testing.

Trial Registration

ClinicalTrials.gov Identifier: NCT04863924