NCT05827081 · Novartis Pharmaceuticals
Phase IIIb Study of Ribociclib + ET in Early Breast Cancer
(Adjuvant WIDER)
What this study is about
The purpose of this where both patients and doctors know the treatment given, conducted at multiple hospitals, phase IIIb, single-treatment group$1 study is to characterize the effectiveness and safety of the combination of ribociclib and standard adjuvant endocrine therapy (ET) on invasive breast cancer-free survival (iBCFS), in a close to clinical practice patient population with HR-positive (HR+), HER2-negative (HER2-), Anatomic Stage Group III, IIB, and a subset of Stage IIA Early Breast Cancer (EBC).
View original scientific description
The purpose of this open-label, multicenter, phase IIIb, single-arm study is to characterize the efficacy and safety of the combination of ribociclib and standard adjuvant endocrine therapy (ET) on invasive breast cancer-free survival (iBCFS), in a close to clinical practice patient population with HR-positive (HR+), HER2-negative (HER2-), Anatomic Stage Group III, IIB, and a subset of Stage IIA Early Breast Cancer (EBC).
Interventions
DRUG
Ribociclib
Ribociclib 400 mg orally once daily on days 1-21 of a 28 day cycle followed by 7 days rest
DRUG
Letrozole
Letrozole 2.5 mg orally once daily continuously
DRUG
Ansastrozole
Anastrozole 1 mg orally once daily continuously.
DRUG
Goserelin
Goserelin administered subcutaneously at 3.6 mg once every 4 weeks if the one-month depot formulation is used or at 10.8 mg once every 3 months if the three-month depot formulation is used
DRUG
Leuprolide
Leuprolide administered subcutaneously at 3.75 mg once every 4 weeks if the one-month depot formulation is used or at 11.25 mg once every 3 months if the three-month depot formulation is used
DRUG
Exemestane
Exemestane 25 mg once daily continuously
Primary outcome measures
Invasive Breast Cancer Free Survival (iBCFS) rate at 3 years
Time frame: At 3 years
iBCFS is defined as the time from the date of first dose to the date of the first event of invasive ipsilateral breast tumor recurrence, local/regional invasive recurrence, distant recurrence, death (any cause), or contralateral invasive BC. iBCFS will be assessed using STEEP criteria version 2.0 (Standardized Definitions for Efficacy End Points in Adjuvant Breast Cancer Trials), as assessed by Investigator. The iBCFS rate at 3 years will be assessed.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Participant is an adult, male or female ≥ 18 years of age at the time of informed consent form signature (IC).
- Participant has a histologically and/or cytologically confirmed diagnosis of estrogen-receptor positive and/or progesterone receptor positive breast cancer (BC) based on the most recently analyzed tissue sample tested by a local laboratory prior to enrollment.
- Participant has HER2- BC defined as a negative in situ hybridization test or an immunohistochemistry (IHC) status of 0, 1+ or 2+. If IHC is 2+, a negative in situ hybridization (FISH, CISH, or SISH) test is required by local laboratory testing based on the most recently analyzed tissue sample.
- Participants may have already received any standard neoadjuvant and/or adjuvant ET, including tamoxifen or toremifene at the time of informed consent signature, but enrollment should occur within 36 months of prior ET start date and participants should have at least 3 years remaining of endocrine adjuvant therapy.
- For participants with prior ET treatment \> 12 months, restaging is highly recommended (unless contradictory to local regulations) to rule out disease recurrence prior to enrollment.
- The number of participants with prior ET between 12 and 36 months will be capped at 30%. The cap will not apply to Black or African American participants.
- Participant has no contraindication to receive adjuvant ET in the study.
- Participant after surgical resection where tumor was removed completely, with the final surgical specimen microscopic margins free from tumor, and belongs to one of the following categories:
- Anatomic Stage Group III, or
- Anatomic Stage Group IIB, or
- A subset of Anatomic Stage Group IIA.
- Participant has an Eastern Cooperative Oncology Group (ECOG) Performance Status of 0, 1 or 2.
- Participant has adequate bone marrow and organ function.
- ECG values assessed by KardiaMobile-6L device, or standard 12-lead ECG per local investigator where KardiaMobile-6L cannot be used, as:
- QTcF interval at Screening \< 450 msec (QT interval using Fridericia's correction).
- Mean resting heart rate 50-99 beats per minute (determined from the ECG). Key
Exclusion criteria
- Participant with distant metastases of BC beyond regional lymph nodes (Stage IV according to AJCC 8th edition) and/or evidence of recurrence after curative surgery.
- Participant is concurrently using other antineoplastic therapy with the exception of adjuvant ET.
- Participant has any other concurrent severe and/or uncontrolled medical condition that would, in the Investigator's judgment, cause unacceptable safety risks, contraindicate participant participation in the clinical study or compromise compliance with the protocol, or limit life expectancy to ≤5 years.
- Clinically significant, uncontrolled heart disease and/or cardiac repolarization abnormality.
- Pregnant or breast-feeding (lactating) women or women who plan to become pregnant or breast-feed during the trial.
- Women of child-bearing potential (CBP), defined as all women physiologically capable of becoming pregnant, unless they are using highly effective methods of contraception while taking study treatment and for 21 days after stopping the treatment. Other inclusion/exclusion criteria may apply
Where
- Birmingham, Alabama
- Anchorage, Alaska
- Goodyear, Arizona
- Little Rock, Arkansas
- Beverly Hills, California
- Cerritos, California
- Duarte, California
- Fullerton, California
- Los Angeles, California
- Mountain View, California
- Orange, California
- Sacramento, California
And 65 more locations — see the full list below.
Related conditions & keywords
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Oct 16, 2026 · Source of record for eligibility and locations