Benzinga | Jul 2, 2021 11:01AM EDT

Natera Says New Results From Prospective CIRCULATE Trial 'Expand Clinical Utility Of The Signatera MRD Test In Colorectal Cancer'

Natera, Inc. (NASDAQ:NTRA), a pioneer and global leader in cell-free DNA testing, today announced it will present new data on its personalized and tumor-informed molecular residual disease (MRD) assay, Signatera, at the 2021 European Society for Medical Oncology World Congress on Gastrointestinal Cancer (ESMO GI), taking place June 30 - July 3, 2021. Data will be presented in colorectal cancer (CRC) and pancreatic cancer.

Natera will present updated results from the prospective, multi-center, randomized CIRCULATE-Japan trial, the largest MRD-guided study to date in CRC, designed to investigate ctDNA-guided treatment strategies for patients with stage I-IV resected CRC. With follow-up information now available in the first 808 patients in this trial, this readout is multiple times larger than any previous Natera MRD study in CRC, and as such, creates a new benchmark for evaluating test performance.

"We are very encouraged by how quickly we have been able to generate this large, high-quality dataset, and look forward to growing it even further through our collaboration with Natera," said the CIRCULATE-Japan study's Principal Investigator, Dr. Takayuki Yoshino of the National Cancer Center Hospital East, Kashiwa-shi, Chiba, Japan. "We believe that personalized MRD testing is the future and will improve treatment decisions for tens of thousands of colorectal cancer patients in Japan and around the world."

"CIRCULATE-Japan is a landmark prospective trial, and based on these strong interim results, we are highly optimistic they will lead to changes in practice guidelines in early-stage colorectal cancer," said Alexey Aleshin, M.D., Natera's vice president of medical affairs, oncology. "At our core, we are a data-driven company, and these data very clearly demonstrate that Signatera can be an important and accurate tool for helping patients avoid unnecessary treatment."

Details about the abstracts are as follows:

Abstract # O-11 | Oral Presentation | Presenter: Hiromichi Shirasu

Monitoring molecular residual disease by circulating tumor DNA in resectable colorectal cancer: Molecular subgroup analyses of a prospective observational study GALAXY in CIRCULATE-Japan

This oral presentation describes an updated interim analysis of the first 808 patients from CIRCULATE-Japan, the largest prospective MRD study to date in CRC. Personalized Signatera assays were performed preoperatively and then serially after surgery. Preoperative MRD was detected in 95% of patients with stage II--III CRC. Longitudinal MRD-positivity was significantly associated with inferior disease-free survival (hazard ratio = 46.8) and Signatera demonstrated a relapse sensitivity of 93.1%. MRD-positivity at 4 weeks after surgery was significantly associated with nodal positivity and MRD-negative patients had remarkably good prognosis, with recurrence-free survival >99% at six months of follow-up, across all stages and regardless of whether adjuvant treatment was administered.

Abstract # 271 | Poster Presentation | Presenter: Maen Abdelrahim, M.D.

Circulating tumor DNA for early relapse detection and monitoring disease status in patients with early-stage pancreatic adenocarcinoma

A prospective study of seven pancreatic adenocarcinoma patients and one ampullary adenocarcinoma patient who were monitored after surgery using Signatera, in addition to blood biomarkers carcinoembryonic antigen (CEA) and cancer antigen 19-9 (CA 19-9) and radiological imaging. MRD-positivity was found to be associated with poorer recurrence-free survival (HR 10.14, p=0.03). MRD findings correlated with, and preceded, imaging results in 100% of patients who relapsed. MRD was found to be a more specific prognostic biomarker compared to CEA and CA 19-9.