Guardant Health Announces FDA Approval of Guardant360 CDx as Companion Diagnostic for Boehringer Ingelheim’s HERNEXEOS®

Key Terms

liquid biopsy medical

A liquid biopsy is a laboratory test that looks for tiny pieces of tumor or disease-related material — such as DNA, proteins, or cells — circulating in blood or other body fluids, allowing detection and monitoring without a surgical tissue sample. For investors, it matters because these tests can speed diagnosis, guide treatment choices, enable easier repeat testing, and create recurring revenue streams if adopted widely, affecting a medical company's growth and regulatory risk profile.

companion diagnostic regulatory

A companion diagnostic is a medical test designed to identify which patients are likely to benefit from a specific drug or medical treatment, much like a key that shows whether a particular lock will open. For investors, these tests matter because they can increase a drug’s chances of approval and market uptake, create a separate revenue stream, and reduce commercial risk by matching treatments to the patients most likely to respond.

circulating tumor DNA medical

Fragments of DNA shed by cancer cells into the bloodstream that act like tiny fingerprints of a tumor; they can be detected with a blood test rather than a biopsy. Investors care because circulating tumor DNA (ctDNA) enables faster, lower-cost ways to detect disease, track treatment response, identify emerging resistance and enroll patients in trials—factors that can materially affect the commercial prospects of diagnostics and therapeutics.

ctDNA medical

Circulating tumor DNA (ctDNA) is tiny fragments of genetic material shed by cancer cells into the bloodstream, like breadcrumbs that can reveal a tumor’s presence and genetic makeup without needing a biopsy. For investors, ctDNA matters because tests and technologies that detect and analyze these fragments can speed diagnosis, track treatment response, and signal relapse, creating commercial opportunities in diagnostics, personalized therapies, and monitoring services.

non-small cell lung cancer medical

A broad category of lung tumors that grow from the cells lining the airways and make up the majority of lung cancer cases; it includes several subtypes that behave and respond to treatment differently, like different models of the same car family. It matters to investors because its large patient population and variety of treatment options — surgery, traditional chemo, targeted drugs and immunotherapies — create major markets where clinical trial results, drug approvals or changing treatment guidelines can quickly affect a company’s revenue and stock value.

HER2 medical

HER2 is a protein found on the surface of some cancer cells, especially certain breast cancers. When a cancer has too much HER2, it can grow more quickly and be more aggressive. Knowing about HER2 helps doctors choose the best treatments to target these specific cancer cells.

tyrosine kinase medical

A tyrosine kinase is a type of protein that acts like a cellular switch, turning other proteins on or off by attaching a small chemical tag; this helps control cell growth, division and communication much like a traffic light directs cars. Investors watch tyrosine kinases because drugs that block or modify these switches are major targets for therapies—especially in cancer and other growth-related diseases—so progress in related research, trials or approvals can materially affect a company’s prospects and valuation.

objective response rate medical

The objective response rate (ORR) is the percentage of patients in a clinical trial whose tumors measurably shrink or disappear according to preset rules. Investors use it as a quick, objective signal of a drug’s ability to produce a clear treatment effect—like counting how many plants visibly respond after applying a new fertilizer—and higher ORR can improve odds of regulatory approval, commercial success, and company valuation.

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Blood-based liquid biopsy test enables identification of patients eligible for treatment with HERNEXEOS^® (zongertinib tablets)

PALO ALTO, Calif.--(BUSINESS WIRE)-- Guardant Health, Inc. (Nasdaq: GH), a leading precision oncology company, today announced that the U.S. Food and Drug Administration (FDA) has approved Guardant360^® CDx as a companion diagnostic (CDx) for Boehringer Ingelheim’s HERNEXEOS^® (zongertinib tablets), the first targeted therapy for adults with HER2 (ERBB2)-mutant advanced non-small cell lung cancer (NSCLC) as an initial treatment option.

The approval enables Guardant360 CDx, a liquid biopsy test that analyzes circulating tumor DNA (ctDNA) from a simple blood draw, to identify patients with HER2 (ERBB2) tyrosine kinase domain activating mutations who may be eligible for treatment with HERNEXEOS.

HERNEXEOS is indicated for the treatment of adult patients with unresectable or metastatic non-squamous NSCLC whose tumors have HER2 (ERBB2) tyrosine kinase domain activating mutations, as detected by an FDA-authorized test. This indication was approved under accelerated approval based on objective response rate and duration of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial. More information and full prescribing information can be found at HERNEXEOS.com.

“This approval highlights the growing impact of liquid biopsy across advanced cancer care and underscores the utility of Guardant360 CDx to ensuring more patients can be matched to the right therapy at the right time,” said Helmy Eltoukhy, Guardant Health chairman and co-CEO. “Guardant360 CDx has been at the forefront of enabling comprehensive genomic profiling through a simple blood draw, helping clinicians identify actionable mutations in genes such as HER2 with speed and accuracy.”

Guardant360 CDx was the first FDA-approved liquid biopsy that provides comprehensive genomic profiling across multiple tumor types and biomarkers. By detecting tumor-derived alterations in circulating cell-free DNA, the test helps clinicians match patients to appropriate targeted therapies and clinical trials.

“Companion diagnostics are essential to personalized lung cancer care, guiding biomarker-driven treatment decisions,” added Vicky Brown, U.S. Therapeutic Area Head for Oncology and Emerging Areas, Boehringer Ingelheim. “Guardant360 CDx will help identify patients with HER2-mutant advanced non-small cell lung cancer and connect eligible patients to the appropriate targeted therapy when timely treatment decisions matter most.”

NSCLC is the most common type of lung cancer, and a subset of patients harbor HER2 mutations that may be targetable with precision therapies. HER2-mutant NSCLC is an aggressive type of lung cancer that has been associated with a poor prognosis. Blood-based testing offers a faster, less invasive alternative to tissue biopsy, which can be challenging in advanced disease.

This latest FDA approval for Guardant360 CDx marks the 27^th CDx indication across multiple tumor types globally, building on the platform’s increasing clinical utility and broad coverage by Medicare and commercial payers, representing more than 300 million covered lives.

For more information about Guardant360 CDx, visit www.guardanthealth.com.

About Guardant360® CDx

Guardant360 CDx is the first FDA-approved liquid biopsy for comprehensive genomic profiling. It detects multiple genomic alterations across all solid tumors and is approved as a companion diagnostic for therapies in non-small cell lung cancer, breast cancer, and colorectal cancer.

About Guardant Health

Guardant Health is a leading precision oncology company focused on guarding wellness and giving every person more time free from cancer. Founded in 2012, Guardant is transforming patient care and accelerating new cancer therapies by providing critical insights into what drives disease through its advanced blood and tissue tests, real-world data and AI analytics. Guardant tests help improve outcomes across all stages of care, including screening to find cancer early, monitoring for recurrence in early-stage cancer, and treatment selection for patients with advanced cancer. For more information, visit guardanthealth.com and follow the company on LinkedIn, X (Twitter) and Facebook.

Guardant Health Forward-Looking Statements

This press release contains forward-looking statements within the meaning of federal securities laws, including statements regarding the potential utilities, values, benefits and advantages of Guardant Health’s liquid biopsy tests or assays, 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, 2025 and in its other reports filed with or furnished to the Securities and Exchange Commission. 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.

View source version on businesswire.com: https://www.businesswire.com/news/home/20260610919127/en/

Investor Contact:
Zarak Khurshid
investors@guardanthealth.com

Media Contact:
Meaghan Smith
press@guardanthealth.com

Source: Guardant Health, Inc.