Targeted Tissue and Cell-Free Tumor DNA Sequencing of Advanced Lung Squamous-Cell Carcinoma Reveals Clinically Significant Prevalence of Actionable Alterations.

Abstract:

BACKGROUND:Major guidelines do not recommend routine molecular profiling of lung squamous-cell carcinoma (LUSC) because the prevalence of actionable alterations is thought to be low. Increased utilization of next-generation sequencing (NGS), particularly with cell-free circulating tumor DNA, facilitates reevaluation of this premise. PATIENTS AND METHODS: We retrospectively evaluated the prevalence of actionable alterations in 2 distinct LUSC cohorts totaling 492 patients. A total of 410 consecutive patients with stage 3B or 4 LUSC were tested with a targeted cell-free circulating DNA NGS assay, and 82 patients with LUSC of any stage were tested with a tissue NGS cancer panel. RESULTS:In the overall cohort, 467 patients (94.9%) had a diagnosis of LUSC, and 25 patients (5.1%) had mixed histology with a squamous component. A total of 10.5% of the LUSC subgroup had somatic alterations with therapeutic relevance, including in EGFR (2.8%), ALK/ROS1 (1.3%), BRAF (1.5%), and MET amplification or exon 14 skipping (5.1%). Sixteen percent of patients with mixed histology had an actionable alteration. In the LUSC subgroup, 3 evaluable patients were treated with targeted therapy for an actionable alteration; all of them experienced partial response. CONCLUSION:In this large, real-world LUSC cohort, we observed a clinically significant prevalence of actionable alterations. Accurate local histopathologic assessment in advanced-stage LUSC can be challenging. Further evaluation of the genomic landscape in this setting is warranted to potentially identify underappreciated treatment options.

journal_name

Clin Lung Cancer

journal_title

Clinical lung cancer

authors

Lam VK,Tran HT,Banks KC,Lanman RB,Rinsurongkawong W,Peled N,Lewis J,Lee JJ,Roth J,Roarty EB,Swisher S,Talasaz A,Futreal PA,Papadimitrakopoulou V,Heymach JV,Zhang J

doi

10.1016/j.cllc.2018.08.020

subject

Has Abstract

pub_date

2019-01-01 00:00:00

pages

30-36.e3

issue

1

eissn

1525-7304

issn

1938-0690

pii

S1525-7304(18)30233-X

journal_volume

20

pub_type

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