Study Shows Guardant360 Liquid Biopsy Predicts Response to Pembrolizumab-Based Immunotherapy in Patients with Metastatic Non-Small Cell Lung Cancer

The single-center, prospective, observational study evaluated molecular response in patients with mNSCLC (n=51) receiving pembrolizumab-based therapy, as monotherapy or with chemotherapy, as first- or second-line treatment. Changes in ctDNA were evaluated from baseline to nine weeks post-therapy initiation, and correlated with clinical and radiographic response.

In the study, the Guardant360 test showed that molecular responders achieved improved durable clinic benefit (log mean 49.4% vs. 3.5%) and significantly longer progression-free survival (median 14.1 vs. 4.4 months) and overall survival (median 22.1 vs. 12.0 months) compared to non-molecular responders. Molecular response was also associated with radiologic response as assessed by Response Evaluation Criteria in Solid Tumors (RECIST) .

“Unfortunately, only a subset of patients with metastatic non-small cell lung cancer will respond to pembrolizumab-based therapy, and their failure to achieve clinical benefit becomes evident after their disease has progressed,” said Helmy Eltoukhy, Guardant Health CEO. “This study adds to the growing body of evidence showing that our Guardant360 test can effectively measure molecular response, giving clinicians an earlier indication whether to continue or stop treatment, explore other therapeutic regimens, or enroll the patient in a clinical trial.”

The Guardant360 test is used to guide treatment in metastatic non-small cell lung cancer as the number of treatment-relevant genomic alterations continues to grow. Using next-generation sequencing, Guardant360 analyzes 83 genes using cell-free tumor DNA from blood samples. The Guardant360 test is broadly covered by Medicare for use across the vast majority of advanced solid tumors, including patients with metastatic non-small cell lung cancer. Last year, the FDA approved the Guardant360 CDx for tumor mutation profiling, also known as comprehensive genomic profiling (CGP), in patients with any solid malignant neoplasm (cancerous tumor).

“These are exciting results that further support the value of liquid biopsies as a noninvasive tool to measure early treatment responses by evaluating molecular response or changes in circulating tumor DNA,” said Charu Aggarwal, MD, MPH, Leslye M. Heisler Associate Professor for Lung Cancer Excellence at Penn’s Perelman School of Medicine and Abramson Cancer Center “We look forward to additional studies to help make this approach a reality in the clinical setting to personalize immunotherapy based treatment decisions for patients with metastatic non-small cell lung cancer.”

The publication, titled “Serial Monitoring of Circulating Tumor DNA by Next-Generation Gene Sequencing as a Biomarker of Response and Survival in Patients With Advanced NSCLC Receiving Pembrolizumab-Based Therapy,” can be found here: doi.org/10.1200/PO.20.00321.

About Guardant Health

Guardant Health is a leading precision oncology company focused on helping conquer cancer globally through use of its proprietary blood tests, vast data sets, and advanced analytics. The Guardant Health oncology platform leverages capabilities to drive commercial adoption, improve patient clinical outcomes, and lower healthcare costs across all stages of the cancer care continuum. Guardant Health has commercially launched liquid biopsy-based Guardant360^®, Guardant360 CDx, and GuardantOMNI^® tests for advanced stage cancer patients, and Guardant Reveal^™ test for early-stage cancer patients. These tests fuel development of its LUNAR screening program, which aims to address the needs of asymptomatic individuals eligible for cancer screening and individuals at a higher risk for developing cancer with early detection.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of federal securities laws, including statements regarding the potential scope, impact or benefit of Guardant Health liquid biopsies which involve risks and uncertainties that could cause the actual results to differ materially from the anticipated results and expectations expressed in these forward-looking statements. These statements are based on current expectations, forecasts and assumptions, and actual outcomes and results could differ materially from these statements due to a number of factors. These and additional risks and uncertainties that could affect Guardant Health’s financial and operating results and cause actual results to differ materially from those indicated by the forward-looking statements made in this press release include those discussed under the captions “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operation” and elsewhere in its Annual Report on Form 10-K for the year ended December 31, 2020 as well as in its other reports filed with the Securities and Exchange Commission, including, when filed, its Quarterly Report on Form 10-Q for the period ended March 31, 2021. The forward-looking statements in this press release are based on information available to Guardant Health as of the date hereof, and Guardant Health disclaims any obligation to update any forward-looking statements provided to reflect any change in its expectations or any change in events, conditions, or circumstances on which any such statement is based, except as required by law. These forward-looking statements should not be relied upon as representing Guardant Health’s views as of any date subsequent to the date of this press release.

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Source: Guardant Health, Inc.

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