ASCO 2025: REVEAL GENOMICS Unveils New HER2DX Data From 800+ Patients

REVEAL GENOMICS, S.L., a biotechnology company advancing precision oncology through biomarker innovation, today announced the presentation of four independent studies at the 2025 ASCO Annual Meeting. The studies, involving more than 800 patients, evaluated the clinical utility of its flagship test, HER2DX, in early-stage HER2-positive (HER2+) breast cancer.

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The four studies, CompassHER2 pCR, BionHER, RESPECT and DFCI, validate HER2DX as a powerful genomic tool for predicting response to therapy and long-term prognosis, addressing critical questions. The findings, which provide valuable insights for optimizing treatment strategies in early-stage HER2+ breast cancer and metastatic breast cancer, will be shared in oral and poster sessions led by academic investigators from the U.S., Europe, and Japan.

CompassHER2 pCR or EA1181 (U.S.): HER2DX determining response to THP-based de-escalated therapy

This study is led by the ECOG-ACRIN Cancer Research Group (ECOG-ACRIN), a scientific organization that designs and conducts cancer research involving adults who have or are at risk of developing cancer, comprising nearly 1,400 member institutions in the U.S. and around the world.

HER2DX was evaluated as a secondary aim as part of a pre-specified, prospectively planned analysis embedded in the CompassHER2 pCR trial, also known as EA1181 (NCT04266249). This large, prospective multicenter phase II trial is assessing neoadjuvant taxane, trastuzumab, and pertuzumab (THP) in more than 2,000 patients with stage II–III HER2+ breast cancer, without the use of anthracyclines, cyclophosphamide, and carboplatin. The HER2DX assay was defined as a key secondary endpoint, with profiling of all available baseline samples planned.

Among 569 patients assessed to date for the HER2DX pathologic complete response (pCR) score, those with higher scores achieved significantly greater pCR rates, independent of estrogen receptor (ER) status. These findings confirm the ability of HER2DX to identify tumors more likely to respond to THP. Importantly, additional results are expected from this trial, as patients continue to be followed for the primary endpoints of 3-year survival outcomes, and the study team plans to profile many more baseline samples.

“The ability to predict response to THP is extremely valuable,” said Dr. Nadine Tung, Director of Breast Medical Oncology at Beth Israel Deaconess Medical Center, Professor of Medicine at Harvard Medical School, and Principal Investigator of the CompassHER2 pCR (EA1181) trial. “HER2DX provides a biology-driven tool that contributes to the selection of patients who can safely reduce chemotherapy, something we’ve long needed in HER2-positive early breast cancer.”

“It is encouraging to see the assay’s performance in both ER-positive and ER-negative subgroups,” added Dr. Tung. “The plan is to profile all available samples from the trial, and these early data already provide valuable insights for guiding treatment selection.”

BionHER trial (Spain): Validation of HER2DX-guided de-escalation strategy

The BionHER phase II trial (NCT05912062) evaluated HER2DX in 83 patients with stage I–III HER2+ breast cancer treated with neoadjuvant THP for up to 15 weeks at the Catalan Institute of Oncology (ICO L’Hospitalet, Barcelona, Spain). HER2DX was successfully performed in all baseline FFPE tumor samples.

The HER2DX pCR score was significantly associated with pCR with a performance AUC of 0.835. Patients classified by HER2DX pCR score into low, medium, and high groups had increasing pCR rates of 13.3%, 51.6%, and 81.8%, respectively. HER2DX outperformed traditional biomarkers, such as ER, Ki-67, and tumor-infiltrating lymphocytes, in predicting pCR.

“HER2DX is transforming the way we approach treatment selection in HER2-positive disease,” said Dr. Sònia Pernas, head of the breast cancer unit at ICO L’Hospitalet, and Principal Investigator of the BionHER study. “By identifying tumors more likely to respond to dual HER2 blockade with a single taxane, we are increasingly able to personalize treatment intensity without compromising efficacy.”

RESPECT trial (Japan): a response for an unrepresented population

Trans-RESPECT is a prespecified translational analysis within the Japanese RESPECT non-inferiority trial (NCT01104935), in which 266 patients aged 70–80 years with stage I-III HER2+ breast cancer were randomized to receive adjuvant trastuzumab with or without chemotherapy (Sawaki et al. J Clin Oncol 2020). HER2DX was assessed in 154 of these patients, with a median follow-up of 9.1 years. The HER2DX risk score effectively stratified patients by 10-year relapse-free survival (86.6% in the low-risk group vs. 68.4% in the high-risk group) and overall survival (94.5% vs.72.5%). Notably, chemotherapy conferred an overall survival benefit only in tumors classified as pCR-high by HER2DX, with a significant interaction p-value of 0.045.

“HER2DX provided clear long-term prognostic information in this elderly population,” said Dr. Kazuki Nozawa, Lead Investigator of Trans-RESPECT, from the Department of Advanced Clinical Research and Development and the Department of Breast Surgery at Nagoya City University Graduate School of Medical Sciences. “Importantly, its ability to help identify which patients may benefit from adjuvant chemotherapy is highly relevant to clinical decision-making. Older patients with HER2DX low-risk scores, particularly those classified as pCR-low or -medium, appear to be ideal candidates for trastuzumab alone, without chemotherapy.”

DFCI T-DXd study (U.S.): predicting survival outcome to T-DXd

Dana-Farber Cancer Institute (DFCI) conducted a retrospective analysis of 41 patients with metastatic breast cancer (25 HER2-positive, 16 HER2-negative) treated with trastuzumab deruxtecan (T-DXd) monotherapy between 2017 and 2023. The HER2DX HER2 signature score was significantly associated with time to next treatment (p=0.001). When stratified into tertiles, patients in the highest tertile had a median time to next treatment of 12.03 months compared to 4.7 months in the lowest tertile (p=0.02).

“Quantitative measurement of HER2 amplicon expression by HER2DX is a key determinant of T-DXd activity in metastatic breast cancer,” said Dr. Sara M. Tolaney, Chief of the Division of Breast Oncology at Dana-Farber Cancer Institute. She added, “Further evaluation of this genomic test in ongoing T-DXd trials is warranted.”

HER2DX makes a significant impact at ASCO 2025

“ASCO 2025 marks a pivotal milestone for HER2DX,” said Dr. Aleix Prat, Chief Scientific Officer and co-founder of REVEAL GENOMICS. “This test is demonstrating clinical value in real-world practice across continents and care settings, assisting in the tailoring of chemotherapy intensity in the neoadjuvant setting and supporting chemotherapy-free decisions in the adjuvant setting.”

Patricia Villagrasa, CEO and co-founder, added, “HER2DX was developed with HER2+ disease at its core, and these four high-quality, independent studies reinforce its clinical value. As we continue to grow globally, this is a clear example of how REVEAL GENOMICS is turning cutting-edge science into meaningful solutions that advance personalized cancer care worldwide.”

About HER2DX

HER2DX is the world’s first diagnostic test formulated specifically for HER2+ breast cancer. Marketed by REVEAL GENOMICS since January 2022, the HER2DX is a standardized 27-gene expression test for patients with early-stage HER2+ breast cancer.

HER2DX is a prognostic and predictive assay based on clinical and genomic data. The test integrates clinical information (i.e., tumor size and nodal status) with biological information tracking immune response, luminal differentiation, tumor cell proliferation, and expression of the HER2 17q12-21 chromosomal amplicon, including the ERBB2 gene.

HER2DX^®️predicts:

• Risk of relapse score (high vs. low): the risk of recurrence in patients with newly diagnosed HER2+ breast cancer.
• pCR likelihood score (high vs. medium vs. low): the likelihood of a patient responding to anti-HER2-based treatment before surgery.
• ERBB2 score (high vs. medium vs. low): the quantitative expression of ERBB2 mRNA across HER2-negative, HER2-low and HER2+ breast cancer.

About REVEAL GENOMICS
REVEAL GENOMICS, S.L., together with its U.S. subsidiary REVEAL GENOMICS, Inc., is a biotechnology company dedicated to redefining the role of biomarkers in oncology. The company focuses on developing innovative diagnostic tools that optimize therapeutic decision-making for individuals with cancer. By leveraging advanced genomic technologies, sophisticated computational algorithms, and machine learning, REVEAL GENOMICS generates novel insights into cancer biology and treatment response. academic and clinical institutions to advance precision oncology.

REVEAL GENOMICS, S.L. is a spin-off company of Hospital Clínic of Barcelona, IDIBAPS, the University of Barcelona (U.B.), and the Vall d’Hebron Institute of Oncology (VHIO).

REVEAL GENOMICS^® and HER2DX^® are registered trademarks of REVEAL GENOMICS, S.L.

For further information visit: http://www.reveal-genomics.com

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