Adaptive Biotechnologies Highlights New Data at 2025 ASCO Annual Meeting and EHA 2025 Congress Demonstrating How clonoSEQ® MRD Assessment is Optimizing Patient Care and Drug Development in Lymphoid Cancers

SEATTLE, May 30, 2025 (GLOBE NEWSWIRE) -- Adaptive Biotechnologies Corporation (NASDAQ:ADPT), a commercial stage biotechnology company that aims to translate the genetics of the adaptive immune system into clinical products to diagnose and treat disease, today announced that its next-generation sequencing (NGS)-based clonoSEQ^® test for measurable residual disease (MRD) assessment will be included in 30 presentations, including a total of 14 oral presentations, across the American Society of Clinical Oncology (ASCO) Annual Meeting taking place May 30-June 3 in Chicago and the European Hematology Association (EHA) Congress taking place June 12-15 in Milan. These presentations include notable new data supporting the clinical actionability of clonoSEQ in both multiple myeloma (MM) and chronic lymphocytic leukemia (CLL).

"The breadth of new MRD evidence being shared across various blood cancer types at ASCO and EHA this year highlights the transformative impact MRD is having on clinical care and drug development," said Susan Bobulsky, Chief Commercial Officer, MRD, Adaptive Biotechnologies. "These data presentations are a testament to the central role that clonoSEQ MRD testing now plays in clinical management and drug development across lymphoid cancers, particularly when combined with several clonoSEQ data presentations in diffuse large B-cell lymphoma (DLBCL) anticipated at the 18^th International Conference on Malignant Lymphoma (iCML) on June 17-21, 2025 in Lugano, Switzerland."

Selected presentations include:

Data advancing the clinical actionability of clonoSEQ MRD testing

• Results from MIDAS, a phase 3 randomized study of 718 transplant-eligible, newly diagnosed multiple myeloma (NDMM) patients, demonstrate the use of MRD status to guide therapy post-induction. (ASCO Abstract 7500, June 3, 9:45-9:57 a.m. CDT, S100bc, McCormick Place Convention Center)
• Interim data from ADVANCE, a phase 2 randomized study of 306 transplant-eligible patients with NDMM shows the impact of MRD-guided assessments post-induction (ASCO Abstract 7503, June 3, 10:21-10:33 a.m. CDT, S100bc, McCormick Place Convention Center)
• Interim results from VENETOSTOP, a phase 2 study of 66 CLL patients, report the use of MRD status to shorten duration of venetoclax-based therapy. (EHA Abstract PS1568, June 14, 6:30 p.m. CEST, Poster Hall, Milano Convention Centre)

Studies utilizing clonoSEQ MRD assessment as a critical indicator of quadruplet regimen efficacy in multiple myeloma

• Results from the phase 3 IsKia study of 151 transplant-eligible NDMM patients demonstrates increased rates of sustained MRD negativity at 10^-6 with isatuximab plus carfilzomib, lenalidomide, and dexamethasone. (ASCO Abstract 7502, June 3, 10:09-10:21 a.m. CDT, S100bc, McCormick Place Convention Center)

• Follow-up data from PERSEUS, a phase 3 trial of 709 transplant-eligible patients with NDMM reports the impact of sustained MRD negativity status on progression free survival (PFS) with subcutaneous daratumumab plus bortezomib, lenalidomide and dexamethasone (D-VRd) induction and DR maintenance. (ASCO Abstract 7501, June 3, 9:57-10:09 a.m. CDT, S100bc, McCormick Place Convention Center)

• Results from DREAMM-8, a Phase 3 study in 302 patients with relapsed or refractory multiple myeloma, found superior PFS and higher MRD negativity rates in patients treated with belantamab mafodotin plus pomalidomide and dexamethasone (BPd) as compared to standard-of-care pomalidomide, bortezomib, and dexamethasone (PVd). (ASCO Abstract 7515, June 2, 9:00-9:06 a.m. CDT E450b, McCormick Place Convention Center)

Data to be presented at ASCO:

Data to be presented at EHA:

*Indicates data to be presented at both ASCO and EHA.

About clonoSEQ

clonoSEQ^® is the first and only FDA-cleared in vitro diagnostic (IVD) test for detecting and tracking minimal (or measurable) residual disease (MRD) in patients with multiple myeloma (MM) or B-cell acute lymphoblastic leukemia (B-ALL) using bone marrow, and in patients with chronic lymphocytic leukemia (CLL) using blood or bone marrow. clonoSEQ is also available in diffuse large B-cell lymphoma (DLBCL), mantle cell lymphoma (MCL) and other lymphoid cancers and specimen types as a CLIA-validated laboratory developed test (LDT). clonoSEQ is covered by Medicare for MM, CLL, ALL, DLBCL and MCL.

clonoSEQ identifies and quantifies DNA sequences in malignant cells—detecting one cancer cell in one million healthy cells—to help clinicians and researchers assess and monitor MRD with precision over time. It delivers standardized, sensitive results that inform treatment decisions, predict outcomes, and detect relapses earlier.

clonoSEQ is CE-marked under the EU In Vitro Diagnostic Regulation (IVDR). For intended use details in the EU, see the instructions for use, available on request.

To review the FDA-cleared uses of clonoSEQ, visit clonoSEQ.com/technical-summary.

About Adaptive Biotechnologies

Adaptive Biotechnologies ("we" or "our") is a commercial-stage biotechnology company focused on harnessing the inherent biology of the adaptive immune system to transform the diagnosis and treatment of disease. We believe the adaptive immune system is nature's most finely tuned diagnostic and therapeutic for most diseases, but the inability to decode it has prevented the medical community from fully leveraging its capabilities. Our proprietary immune medicine platform reveals and translates the massive genetics of the adaptive immune system with scale, precision and speed. We apply our platform to partner with biopharmaceutical companies, inform drug development, and develop clinical diagnostics across our two business areas: Minimal Residual Disease (MRD) and Immune Medicine. Our commercial products and clinical pipeline enable the diagnosis, monitoring, and treatment of diseases such as cancer, autoimmune disorders, and infectious diseases. Our goal is to develop and commercialize immune-driven clinical products tailored to each individual patient.

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ADAPTIVE INVESTORS

Karina Calzadilla, Vice President, Investor Relations and FP&A

201-396-1687

[email protected]

ADAPTIVE MEDIA

Erica Jones, Associate Corporate Communications Director

206-279-2423

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