Personalis Pioneers Advancement in MRD Testing with the Launch of its Real-Time Variant Tracker™

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FREMONT, Calif.--(BUSINESS WIRE)--Jan 12, 2026--

Personalis, Inc. (Nasdaq: PSNL), a leader in advanced genomics for cancer, today announced the early access launch of Real-Time Variant Tracker, a powerful new option added to its ultrasensitive NeXT Personal molecular residual disease (MRD) test designed to detect small traces of circulating tumor DNA (ctDNA) in the blood that represent residual or recurrent cancer.

Clinicians using the NeXT Personal MRD test will now be able to opt-in for additional reporting on detected resistance and therapeutically targetable mutations that can inform new opportunities to optimize patient management. This includes ESR1 mutations, which can be an indication to switch therapy for HR+/HER2- breast cancer patients, and hundreds of other clinically relevant mutations for solid tumors.

“Personalis pioneered the shift toward ultrasensitive MRD, and today we are once again taking another innovative step forward,” said Chris Hall, Chief Executive Officer and President of Personalis. “Real-Time Variant Tracker marks a new milestone in our mission to enable physicians to fight cancer with a truly personalized approach.”

This new capability enables clinicians using the NeXT Personal MRD test to additionally monitor for:

• Emerging or evolving therapy resistance mutations that could impact clinical management
• Therapeutically targetable mutations associated with approved therapies

“The ability to detect evolving, clinically relevant mutations in genes like ESR1 during MRD monitoring and surveillance gives physicians a new tool to help optimize care,” said Richard Chen, M.D., M.S., Chief Medical Officer and Executive Vice President of R&D at Personalis. “We are continuing to innovate to empower physicians with the precision tools they need to better manage patients through their entire journey.”

Availability

The Real-Time Variant Tracker option for NeXT Personal is available to physicians who participate in the Early Access Program (EAP). The EAP is designed for clinical and academic leaders using NeXT Personal who are looking to integrate this new capability into their clinical practice and research. The ability to track mutations is also available to Personalis’ biopharma partners.

About Personalis, Inc.

At Personalis, we are transforming the active management of cancer through breakthrough personalized testing. We aim to drive a new paradigm for cancer management, guiding care throughout the patient journey. Our highly sensitive assays combine tumor-and-normal profiling with proprietary algorithms to deliver advanced insights even as cancer evolves over time. Our products are designed to detect minimal residual disease (MRD) and recurrence at the earliest timepoints, enable selection of targeted therapies based on ultra-comprehensive genomic profiling, and enhance biomarker strategy for drug development. Personalis is based in Fremont, California. To learn more, visit www.personalis.com and connect with us on LinkedIn and X ( Twitter ).

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include all statements that are not historical facts, including statements relating to: the attributes, advantages, capabilities, sensitivity, availability and clinical relevance of Personalis’ assays and products including the NeXT Personal test and the Real-Time Variant Tracker option, the ability for Real-Time Variant Tracker to identify emerging resistance and actionable targets, remain unique in its ability to monitor mutations, and inform new opportunities to optimize patient management, participation of physicians in the EAP and adoption of mutation tracking by Personalis’ biopharma partners, and the success of Personalis’ continued innovation in the MRD space. Such forward-looking statements involve known and unknown risks and uncertainties and other factors that may cause actual results to differ materially from any anticipated results or expectations expressed or implied by such statements, including the risks, uncertainties and other factors that relate to Personalis’ ability to demonstrate attributes, advantages or clinical validity of the NeXT Personal test and the Real-Time Variant Tracker option, the NeXT Personal MRD assay remaining unique in its ability to detect traces of cancer in the ultrasensitive range and its ability to monitor mutations; future clinical data differing from the clinical data previously presented or expected results; the rate of adoption and use of the NeXT Personal test and the Real-Time Variant Tracker option; changes in health care policy, which could increase Personalis’ costs, decrease Personalis’ revenue, and impact sales of and reimbursement for Personalis’ tests; the impact of competition and macroeconomic factors on Personalis’ business; the partnering and/or collaboration arrangements that Personalis has entered into or may enter into in the future may not be successful, or may terminate, which could adversely impact Personalis’ business or affect its ability to develop and commercialize its services and products; having a limited number of suppliers; and customer concentration. These and other potential risks and uncertainties that could cause actual results to differ materially from the results predicted in these forward-looking statements are described under the captions “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Personalis’ Annual Report on Form 10-K for the year ended December 31, 2024, filed with the Securities and Exchange Commission (SEC) on February 27, 2025, as updated by Personalis’ Quarterly Report on Form 10-Q for the quarter ended September 30, 2025, filed with the SEC on November 4, 2025. All information provided in this release is as of the date of this press release, and any forward-looking statements contained herein are based on assumptions that we believe to be reasonable as of this date. Undue reliance should not be placed on the forward-looking statements in this press release, which are based on information available to us on the date hereof. Personalis undertakes no duty to update this information unless required by law.

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CONTACT: Investor Relations:

Caroline Corner

[email protected]

415-202-5678Media Contact

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KEYWORD: CALIFORNIA UNITED STATES NORTH AMERICA

INDUSTRY KEYWORD: BIOTECHNOLOGY HEALTH GENETICS PHARMACEUTICAL ONCOLOGY

SOURCE: Personalis, Inc.

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PUB: 01/12/2026 04:00 PM/DISC: 01/12/2026 04:00 PM

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