Grail Cancer Blood Test Fails Key NHS Trial | STAT News

A highly anticipated blood test designed to detect multiple types of cancer at an early stage has encountered a significant setback. Thursday, February 19, 2026, Grail, Inc. Announced that a large-scale study conducted with the National Health Service (NHS) in England did not meet its primary goal.

The test, known as Galleri, analyzes blood samples for DNA fragments shed by cancerous tumors. It aims to identify the presence of cancer even before symptoms appear, potentially leading to earlier diagnosis and improved treatment outcomes. Grail has positioned Galleri as a groundbreaking tool in cancer screening, capable of detecting over 50 different types of cancer.

While the company continues to sell Galleri at a list price of $1,000, it has not yet received approval from the U.S. Food and Drug Administration (FDA). In 2025, Grail sold 185,000 tests, generating $136.8 million in revenue. The news of the study’s results sent the company’s stock price down 47% in after-hours trading.

The specifics of the NHS study’s findings remain largely undisclosed, as detailed reporting is behind a paywall. However, the failure to meet its primary goal raises serious questions about the test’s effectiveness as a widespread cancer screening tool. The initial promise of Galleri hinged on its ability to not only detect cancer early but also to pinpoint the potential location of the tumor, guiding further diagnostic investigations.

Grail, founded in 2015 and based in Menlo Park, California, was acquired by Illumina in 2021. However, due to regulatory concerns, the European Union ordered Grail to be spun out from Illumina, a process completed on June 24, 2024. This separation reflects the complex landscape of innovation and regulation in the biotechnology sector.

The concept behind Galleri relies on the principle of liquid biopsy – analyzing circulating tumor DNA (ctDNA) in the bloodstream. Illumina’s research demonstrated that repeated DNA sequencing could improve the accuracy of detecting these cancer-specific DNA fragments. The initial clinical trials aimed to recruit over 100,000 participants to gather sufficient data for accurate biomarker detection and interpretation.

Despite the initial enthusiasm, concerns about the test’s performance and ethical implications have been raised. Some experts have described large-scale trials, such as the NHS study, as “overhyped and unethical.” The potential for false positives, leading to unnecessary anxiety and invasive follow-up procedures, is a significant concern. The cost of the test, at $1,000, raises questions about accessibility and equitable healthcare delivery.

The recent data, while disappointing, isn’t necessarily the end of the road for multi-cancer early detection tests. Research in this field is rapidly evolving, and other companies are developing similar technologies. A study released in October 2025 showed that Galleri did detect cancers early, but experts continue to debate whether liquid biopsies can ultimately improve survival rates.

The challenges faced by Grail highlight the complexities of translating promising scientific discoveries into effective clinical practice. Rigorous clinical trials, careful evaluation of benefits and risks, and a commitment to ethical principles are essential for ensuring that new cancer screening technologies truly benefit patients. The future of cancer screening will likely involve a combination of approaches, including traditional methods like mammography and colonoscopy, alongside innovative technologies like liquid biopsies, but further research and validation are crucial.

As of 2024, Grail reported revenues of $126 million, but also significant operating and net losses of $2.2 billion and $2.0 billion respectively. The company employs approximately 1,000 people and holds total assets of $2.98 billion. These financial figures underscore the substantial investment required to develop and commercialize cutting-edge cancer detection technologies.