Signatera-Guided CDK4/6 Inhibitor Therapy in Breast Cancer (NCT07214532) | Clinical Trial Compass
RecruitingNot Applicable
Signatera-Guided CDK4/6 Inhibitor Therapy in Breast Cancer
United States725 participantsStarted 2026-05-08
Plain-language summary
The purpose of this study is to evaluate the efficacy and safety of ctDNA-guided initiation of CDK4/6 inhibitor therapy using the Signatera™ Designed on Genome test (referred to as "Signatera Genome") in participants with intermediate-risk HR+/HER2- early-stage breast cancer. Based on ctDNA test results, participants will either start CDK4/6 inhibitor therapy in addition to hormone therapy or continue hormone therapy with ongoing ctDNA surveillance. This study will compare outcomes to historical controls from the NataLEE trial to determine whether ctDNA-guided timing maintains efficacy while reducing unnecessary treatment. Participants will be followed for up to 9 years with regular blood draws, hormone therapy, imaging as needed, and quality-of-life assessments.
Who can participate
Age range
18 Years
Sex
ALL
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion criteria
. Signed and dated Informed Consent Form (ICF) obtained prior to any trial-specific screening procedure.
. Patient is ≥ 18 years-old at the time of ICF signature.
. Patient is female with known menopausal status at the time of initiation of adjuvant endocrine therapy (ET), or male.
. Patient with histologically confirmed unilateral and unifocal primary invasive adenocarcinoma of the breast prior to initiating adjuvant chemotherapy, if indicated, or within 6 months of initiating adjuvant endocrine therapy if chemotherapy is not indicated. Patients who receive neoadjuvant endocrine therapy or chemotherapy are allowed to enroll.
. Patient has breast cancer that is positive for ER and/or PR according to the local laboratory as determined on the most recently analyzed tissue sample.
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
. Patient has HER2-negative breast cancer defined as a negative in situ hybridization test (FISH, CISH, or SISH) or an immunohistochemistry (IHC) status of 0 or 1+. If IHC is 2+, a negative in situ hybridization (ISH) test is required to confirm the HER2-negative status.
. Patient has available archival tumor tissue from the diagnostic biopsy or surgical specimen, for submission to a central laboratory for Signatera testing (unless Signatera Genome clinical testing has already been performed).
. Patient after surgical resection where tumor was removed completely (i.e., negative microscopic margins on final pathology) and have Anatomic Stage II that is eligible for adjuvant CDK4/6 inhibitors. The criteria to be eligible for adjuvant CDK4/6 inhibitors include N1, or N0 with T3 or T2 with either G3, or G2 with Ki67 greater or equal to 20% or high genomic risk score.
Exclusion criteria
. Patient has had prior exposure to a CDK4/6 inhibitor.
. Patient is concurrently using hormone replacement therapy.
. Patient with a known contraindication or hypersensitivity to ribociclib or abemaciclib as per the FDA indication label.
. Patients with a multicentric and/or multifocal and synchronous contralateral breast cancer are ineligible.
. Patient with distant metastases of breast cancer beyond regional lymph nodes (stage IV according to AJCC 8th edition) and/or evidence of recurrence after curative surgery.
. Patient has a concurrent invasive malignancy or a prior invasive malignancy whose treatment was completed within 5 years before ICF signature. Note: Patients with prior or concurrent in situ malignancies are eligible provided that adequate curative treatment is completed prior to enrollment.
. Patient has any other concurrent severe and/or uncontrolled medical condition that would, in the Investigator's judgment, cause unacceptable safety risks, contraindicate patient participation in the clinical trial or compromise compliance with the protocol (e.g. chronic pancreatitis, chronic active hepatitis, liver cirrhosis or any other significant liver disease, active untreated or uncontrolled fungal, bacterial or viral infections, active infection requiring systemic antibacterial therapy, etc.) or limit life expectancy to ≤5 years.
. Patient participated in another interventional study and received treatment with an investigational product (or used an investigational device) within 30 days prior to enrollment or within 5 half-lives of the investigational product, whichever is longer.