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Natera Enrolls First Patients in SIGNAL-ER 101, a Prospective, Interventional Study Evaluating MRD-Guided Therapy in Breast Cancer

$NTRAPress releaseMay 28, 2026, 6:00 AM ETRead the release

Natera has enrolled the first patients in SIGNAL-ER 101, a prospective, interventional study evaluating MRD-guided therapy de-escalation in early-stage breast cancer. The study aims to determine if MRD-negative patients can safely defer adjuvant CDK4/6 inhibitor therapy, potentially avoiding serious adverse events and high costs associated with overtreatment. SIGNAL-ER 101 plans to enroll approximately 725 patients across 50 U.S.

Key figures

Drug Name
Signatera
Phase Of Trial
Prospective, single-arm, multi-center
Study sites
50
Target enrollment
725
Treatment cost reference
$400,000

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