Veracyte, Inc. (Nasdaq: VCYT), a leading genomic diagnostics company, announced that new data from the prospective, randomized integral biomarker BALANCE trial (NCT03371719) finds that the PAM50 molecular signature predicts which patients with recurrent prostate cancer benefit from hormone therapy with apalutamide in addition to salvage radiation therapy. The prostate PAM50 biomarker is currently available for Research Use Only on the Decipher GRID (Genomic Resource for Intelligent Discovery) research tool.
The new findings were shared today by Daniel Spratt, M.D., University Hospitals Seidman Cancer Center, Case Western Reserve University, in a podium presentation at ASTRO 2025, the annual meeting of the American Society for Radiation Oncology, being held in San Francisco.
“Our findings mark the first time, to my knowledge, that a predictive biomarker has been validated in a prospective, biomarker-driven, randomized trial in non-metastatic prostate cancer,” said Dr. Spratt. “Thus, this is an unprecedented advancement for patients who can be more-precisely selected to receive hormone therapy or forego the treatment and the potential side effects.”
For the study, 295 men with recurrent, non-metastatic prostate cancer following prostate-removal surgery were randomly assigned to salvage radiation therapy with a placebo or apalutamide for 6 months. The PAM50 biomarker was a key stratification variable to ensure each arm had a similar proportion of luminal B and non-luminal B subtypes. They were followed for a median of 5 years during which they were evaluated for biochemical failure, which is a rise in levels of prostate-specific antigen (PSA) post treatment—an early sign of salvage therapy failure. Among the 127 men with luminal B molecular subtype tumors (as determined by the PAM50 signature), 72% of those taking apalutamide did not experience biochemical failure, as compared to the 54% rate in the placebo group [HR 0.45 (80% CI 0.29-0.68), p=0.0062]. In the non-luminal B subset, there was no difference between those taking apalutamide versus placebo (70% vs 71%) [HR 0.95 (80% CI 0.65-1.41), p=0.44].
“These results from NRG GU006 represent the highest level of evidence to support routine biomarker testing in recurrent prostate cancer patients planned to receive secondary radiotherapy”, Dr. Spratt added. “With such a strong difference in the metastasis-free survival response to hormone therapy between luminal B and non-luminal-B tumors, the use of the predictive PAM50 biomarker is a game changer to help personalize treatment for men with recurrent prostate cancer beyond merely prognostic tools.”
The PAM50 signature is the third biomarker—assessed through the whole-transcriptome-based Decipher platform—that a major study has shown predicts benefit from hormone therapy, radiation therapy or chemotherapy. Another trial—PREDICT-RT—recently completed enrollment two years early and is evaluating the Decipher Prostate test’s ability to predict benefit of combined hormone therapy (ADT and apalutamide) concurrent with radiation in patients with high-risk prostate cancer at initial diagnosis.
“Prostate cancer, like all cancers, is a disease of the genome,” said Elai Davicioni, Ph.D., Veracyte’s medical director for Urology. “Our Decipher GRID tool uniquely enables researchers to better pinpoint adverse molecular features that are associated with poor outcomes. This can ultimately lead to more-personalized care for each patient based on their tumor’s unique molecular make-up.
“We are proud to partner with the world’s leading prostate cancer researchers to help uncover insights that can change the trajectory of care for each individual patient and also help deliver the next generation of prostate cancer diagnostics.”
The BALANCE trial results are among 9 Decipher-focused abstracts being presented at the ASTRO 2025 conference. More information can be found here.