Natera (NTRA) said Tuesday that a study published in Clinical Cancer Research found its Signatera test helped identify older women with early-stage ER+/HER2- breast cancer who could be treated with primary endocrine therapy without surgery.
The prospective study followed 43 women aged 70 years and older with stage 1-3 breast cancer who chose endocrine therapy instead of surgery, Natera said.
Baseline testing showed 68% of patients were molecular residual disease-negative, and none experienced disease progression, Natera said.
Among patients who tested MRD-positive at baseline, 64% cleared circulating tumor DNA after six months of treatment and remained free of distant progression, the company said.
Tumor progression occurred in five patients, all of whom tested MRD-positive before imaging detected changes, suggesting 100% longitudinal sensitivity in the study, Natera said.
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