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HER2 Negative Breast CancerPhase 2SELECTNCT06953882

Impact of Omitting Chemo Based on Patient's Selection for ER-Positive, HER2-Negative Breast Cancer With Ribociclib and Endocrine Therapy

A Phase 2 study testing Ribociclib 400mg, Letrozole 2.5mg and Anastrazole 1mg in people with HER2 Negative Breast Cancer, run by Yale University at 1 site in United States.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

This is a Phase II, two-arm, single center, patient preference study designed to evaluate the impact of omitting adjuvant chemotherapy in moderate to high-anatomical risk, low-genomic risk (men or premenopausal women T2-3N0 and RS 16-25, or T1-3N1-2 and RS ≤ 25, and postmenopausal women T2-3N0 and RS 26-30, or T1-3N1… Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
HER2 Negative Breast Cancer
What is being tested?
Ribociclib 400mg, Letrozole 2.5mg and Anastrazole 1mg
Could I receive a placebo?
No, everyone receives an active treatment
How many people
140 participants
Where
1 siteUnited States
Study dates
9 Jul 2025to Sep 2030
Phase
Phase 2
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Female or male age ≥ 18 years old and have the ability to understand and the willingness to sign a written informed consent document.
  • Participants may have ipsilateral or contralateral synchronous breast cancer if the highest stage tumor meets entry criteria, and the other sites of disease would not require chemotherapy or HER2-directed therapy.
  • Participants may have multicentric or multifocal breast cancer if the highest stage tumor meets entry criteria, and the other sites of disease would not require chemotherapy or HER2-directed therapy.
  • Participants underwent a total mastectomy, skin-sparing mastectomy, nipple-sparing mastectomy, or a lumpectomy.
  • Participants must have undergone axillary staging with sentinel node biopsy (SNB), targeted axillary dissection (TAD), or axillary lymph node dissection (ALND).
  • The following staging criteria must be met postoperatively according to AJCC 8th edition criteria: men or premenopausal women T2-3N0 and RS 16-25, or T1-3N1-2 and RS ≤ 25, and postmenopausal women T2-3N0 and RS 26-30, or T1-3N1 and RS 26-30, or T1-3N2 and RS ≤ 25.
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  • The tumor must be ER-positive (≥ 10%), HER2-negative, by current ASCO/CAP guidelines based on testing results. HER2-negative breast cancer is defined as a negative in situ hybridization test or an immunohistochemistry (IHC) status of 0 or 1+. If IHC is 2+, a negative in situ hybridization (FISH, CISH, or SISH) test is required to confirm the participant's HER2-negative status (based on the most recently analyzed tissue sample tested by a local laboratory).
  • Participants with known menopausal status at the time of screen.
  • Postmenopausal status is defined as: i. Participant underwent bilateral oophorectomy, or ii. Age ≥ 60 years, or Age < 60 years and amenorrhea for 12 or more months (in the absence of chemotherapy, tamoxifen, toremifene or ovarian suppression) and Follicle-stimulating hormone (FSH) and plasma estradiol are in the postmenopausal ranges per local normal ranges. Note: All women who do not meet the criteria for postmenopausal status are considered premenopausal for the purpose of this trial.
  • HIV-infected participants with undetectable viral load within 6 months and in long term anti-retroviral therapy that would not have a significant drug-drug interaction with ribociclib are eligible for this trial.
  • Radiation therapy should be used according to standard guidelines.
  • Participants must have an ECOG performance status of 0 to 1 within 28 days prior to registration of the study.
  • Participant is able to swallow oral medications.
  • Participants must have adequate organ and marrow function as defined below. All laboratory values must be obtained within 28 days prior to registration of the study.
  • Absolute neutrophil count (ANC) ≥ 1.5 × 109/L.
  • Platelets ≥ 100 × 109/L.
  • Hemoglobin ≥ 9.0 g/dL.
  • Estimated glomerular filtration rate (eGFR) ≥ 30 mL/min/1.73m2 according to the Modification of Diet in Renal Disease (MDRD) formula.
  • Alanine transaminase (ALT) < 2.5 × Upper Limit Normal (ULN).
  • Aspartate transaminase (AST) < 2.5 × ULN.
  • Total serum bilirubin < ULN; or total bilirubin ≤ 3.0 × ULN or direct bilirubin ≤ 1.5 × ULN in patients with well documented Gilbert's Syndrome.
  • Patient must have the following laboratory values within normal limits or corrected to within normal limits with supplements (the local laboratory value should be documented within normal limits after the correction) before enrollment:
  • Potassium.
  • Magnesium.
  • Total Calcium (corrected for serum albumin).
  • Standard 12-lead ECG values assessed as: QTcF interval (using Fridericia's correction) at screening < 450 msec. Resting heart rate 50-90 beats per minute (determined from the ECG).
  • Participant must be willing and able to comply with scheduled visits, treatment plans, laboratory tests, and other trial procedures.
  • Participants must adhere to the following reproductive and contraceptive requirements while on study treatment and within three months after receiving the last dose of the treatment drugs.
  • General requirements: i. Participants must not be pregnant or breastfeeding. ii. Participants must not donate or freeze eggs for future use related to assisted reproduction during the course of this study or within three months after receiving the last dose of the treatment drugs.
  • For participants of childbearing potential: i. A participant of childbearing potential is defined as an individual who is premenopausal and capable of becoming pregnant. This includes individuals using contraception, those who are sexually inactive, and those with partners who have undergone a vasectomy. A participant is considered of childbearing potential if they have reached menarche, have not yet met the criteria for postmenopause (defined as more than 12 consecutive months of amenorrhea without any other medical cause), and have not undergone surgical sterilization (such as hysterectomy or oophorectomy).
  • A negative highly sensitive serum pregnancy test (for β-hCG) must be obtained within two weeks of starting the treatment drug administration.
  • Participants must practice at least one highly effective method of contraception.
  • Highly effective methods of contraception include, but are not limited to: i. Total abstinence (no sexual relations), when this is in line with your preferred and usual lifestyle. Periodic abstinence like calendar, ovulation, symptothermal, post-ovulation methods, and withdrawal are not acceptable methods of contraception.
  • Total hysterectomy (surgical removal of the uterus and cervix) or tubal ligation (getting your "tubes tied") at least six weeks before taking study treatment.
  • Your male partner has already been sterilized with the appropriate documentation. The sterilized male partner should be your sole partner.
  • Placement of an intrauterine device (IUD) v. The use of oral (estrogen and progesterone), injected or implanted hormonal methods of contraception or intrauterine system (IUS) or any other form of hormonal contraception (e.g., hormone vaginal ring, hormonal-based IUD or transdermal hormone contraception) is not allowed in this study.
  • Participant has no contraindication for the adjuvant ET in the trial and is planned to be treated with ET for five years or more.

Who cannot join

  • Participants who meet any of the following criteria will be excluded from study entry:
  • Definitive clinical or radiologic evidence of distant metastases of breast cancer beyond regional lymph nodes (stage IV according to AJCC 8th edition) and/or evidence of recurrence after curative surgery.
  • T4 tumors, including inflammatory breast cancer.
  • N3 tumors.
  • Participants that have received neoadjuvant chemotherapy or biotherapy.
  • Participant is concurrently using hormone replacement therapy.
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  • Participants with a known hypersensitivity to any of the excipients of ribociclib and/or ET (e.g. rare hereditary problems of galactose intolerance, the Lapp lactase deficiency, glucose-galactose malabsorption, and soy allergy).
  • Participant has received any CDK4/6 inhibitor.
  • Participant has a concurrent invasive malignancy or a prior invasive malignancy that requires systemic therapy or place them at more than minimal risk of mortality in the next 5 years.
  • Participant has known active hepatitis B virus (HBV) or hepatitis C virus (HCV) infection (testing is not mandatory, unless required by local regulation).
  • Life expectancy of <5 years due to co-morbid conditions in the opinion of the treating investigator.
  • Non-epithelial breast malignancies such as sarcoma or lymphoma.
  • Hormonally based contraceptive measures must be discontinued prior to registration (including progestin/progesterone IUDs).
  • Pregnancy or lactating women or women who plan to become pregnant or breast-feed during the trial.
  • Note: Pregnancy testing according to institutional standards for women of childbearing potential must be performed at screening.
  • Clinically significant, uncontrolled heart disease and/or cardiac repolarization abnormality, including any of the following:
  • History of documented myocardial infarction (MI), angina pectoris, symptomatic pericarditis, or coronary artery bypass graft within six months prior to screening
  • Documented cardiomyopathy
  • Long QT syndrome or family history of idiopathic sudden death or congenital long QT syndrome, or any of the following:
  • Risk factors for Torsades de Pointes (TdP) including uncorrected hypokalemia or hypomagnesemia, history of cardiac failure, or history of clinically significant/symptomatic bradycardia ii. Concomitant medication(s) with a known risk to prolong the QT interval and/or known to cause TdP that cannot be discontinued or replaced by safe alternative medication (e.g. within five half-lives or seven days prior to starting trial treatment) iii. Inability to determine the QTcF interval d. Clinically significant cardiac arrhythmias (e.g. ventricular tachycardia), complete left bundle branch block, high-grade Atrioventricular (AV) block (e.g. bifascicular block, Mobitz type II- and third-degree AV block) e. Uncontrolled arterial hypertension.
  • Participant is currently receiving any of the following substances within 7 days before registration:
  • Concomitant medications, herbal supplements, and/or fruits (e.g. grapefruit, pummelos, starfruit, Seville oranges) and their juices that are known as strong inhibitors or inducers of CYP3A4/5.
  • Medications that have a narrow therapeutic window and are predominantly metabolized through CYP3A4/5.
  • Participant is currently receiving or has received systemic corticosteroids ≤ 2 weeks prior to starting trial treatment or has not fully recovered from side effects of such treatment. Note: The following uses of corticosteroids are permitted: a short duration (<5 days) of systemic corticosteroids, any duration of topical applications (e.g. for rash), inhaled sprays (e.g. for obstructive airways diseases), eye drops or local injections (e.g. intra-articular).
  • Participant has impairment of GI function or GI disease that may significantly alter the absorption of the oral trial treatments (e.g. uncontrolled ulcerative diseases, uncontrolled nausea, vomiting or diarrhea, malabsorption syndrome, or small bowel resection).
  • Participant has any other concurrent severe and/or uncontrolled medical condition that would, in the principal 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 anti-bacterial therapy, etc.).
  • Participation in other studies involving investigational drug(s) within 30 days prior to registration or within 5 half-lives of the investigational drug(s) (whichever is longer), or participation in any other type of medical research judged not to be scientifically or medically compatible with this trial. If the participant is enrolled or planned to be enrolled in another study that does not involve an investigational drug, the agreement of the Sponsor-Investigator is required to establish eligibility.

Trial locations and contacts

1 site in 1 country. Contact the study team or a site near you to ask about taking part.

United States1 site, 1 recruiting
  • Yale University

    New Haven, Connecticut, 06511

    Carl Brown, 203-785-4095, carl.brown@yale.edu

    Recruiting

Other trials in United States

About this study

Official title: SELECT: A Phase II Adjuvant Trial Evaluating the Impact of Omitting Chemotherapy Based on Patient's Selection for Moderate to High-Anatomical Risk, Low-Genomic Risk, ER-Positive, HER2- Negative Breast Cancer With a Combination Regimen of Ribociclib and Optimized Endocrine Therapy

This is a Phase II, two-arm, single center, patient preference study designed to evaluate the impact of omitting adjuvant chemotherapy in moderate to high-anatomical risk, low-genomic risk (men or premenopausal women T2-3N0 and RS 16-25, or T1-3N1-2 and RS ≤ 25, and postmenopausal women T2-3N0 and RS 26-30, or T1-3N1 and RS 26-30, or T1-3N2 and RS ≤ 25),

Read the detailed description

This is a Phase II, two-arm, single-center, patient-preference clinical trial designed to evaluate the impact of omitting adjuvant chemotherapy in moderate to high-anatomical risk, low-genomic risk, ER-positive, HER2-negative breast cancer treated with a combination regimen of ribociclib and optimized ET. The trial will enroll 140 participants with resected moderate to high-anatomic risk, low-genomic risk (men or premenopausal women T2-3N0 and RS 16-25, or T1-3N1-2 and RS ≤ 25, and postmenopausal women T2-3N0 and RS 26-30, or T1-3N1 and RS 26-30, or T1-3N2 and RS ≤ 25), ER-positive, HER2-negative breast cancer. Participants will have the option to decide whether to include adjuvant chemotherapy in their treatment plan. Arm 1 will receive the combination of ribociclib and optimized ET. Arm 2 will be treated with adjuvant chemotherapy followed by a combination of ribociclib and optimized ET. Enrollment will be closely monitored to ensure that there are 70 evaluable participants in each arm of the study to ensure we can estimate one-year discontinuation rate with a reasonable level of precision.

Being tested
Ribociclib 400mg, Letrozole 2.5mg, Anastrazole 1mg, Goserelin 3.6 MG, Adjuvant chemotherapy
Keywords
premenopausal women T1-3N1-2, postmenopausal women T3N1, postmenopausal women T3N2, ER-positive

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Ribociclib 400mgDrug

    400 mg (2 x 200 mg tablets by mouth) once daily on days 1 to 21 of a 28-day cycle, followed by seven days off ribociclib (Days 22 to 28).

  • Letrozole 2.5mgDrug

    Letrozole will be administered as an endocrine therapy. The regimen will differ depending on the demographic of the patient. For postmenopausal women: Letrozole 2.5 mg by mouth daily continuously. For men or premenopausal women: Letrozole 2.5 mg by mouth daily continuously.

  • Anastrazole 1mgDrug

    For postmenopausal women: Letrozole 2.5 mg by mouth daily continuously or anastrozole 1 mg by mouth daily continuously. For men or premenopausal women: Letrozole 2.5 mg by mouth daily continuously or anastrozole 1 mg by mouth daily continuously.

  • Goserelin 3.6 MGDrug

    For men or premenopausal women: Letrozole 2.5 mg by mouth daily continuously or anastrozole 1 mg by mouth daily continuously, concurrently with goserelin 3.6 mg monthly injection.

  • Adjuvant chemotherapyRadiation

    Adjuvant chemotherapy dose modifications in Arm 2 will be per institutional guidelines and investigator discretion.

Study groups in NCT06953882
Study groupRoleWhat they receive
Ribociclib + Optimized Endocrine TherapyExperimentalCombination of ribociclib and optimized endocrine therapy
Receives: Drug: Ribociclib 400mg; Drug: Letrozole 2.5mg; Drug: Anastrazole 1mg; Drug: Goserelin 3.6 MG
Adjuvant Chemotherapy + Ribociclib & Optimized Endocrine TherapyExperimentalAdjuvant chemotherapy followed by a combination of ribociclib and optimized endocrine therapy
Receives: Drug: Ribociclib 400mg; Drug: Letrozole 2.5mg; Drug: Anastrazole 1mg; Drug: Goserelin 3.6 MG; Radiation: Adjuvant chemotherapy

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Discontinuation rate of ribociclib in patients with resected moderate to high-anatomical risk, low-genomic risk, ER-positive, HER2-negative breast cancer

    Discontinuation rate of ribociclib in participants with resected moderate to high-anatomical risk, low-genomic risk (men or premenopausal women T2-3N0 and RS 16-25, or T1-3N1-2 and RS ≤ 25, and postmenopausal women T2-3N0 and RS 26-30, or T1-3N1 and RS 26-30, or T1-3N2 and RS ≤ 25), ER-positive, HER2-negative breast cancer who choose to forgo adjuvant chemotherapy in their treatment regimen. One-year treatment discontinuation is defined as treatment discontinuation within one year for any reason (e.g., adverse events, disease recurrence, patient/investigator decision, lost to follow up, etc).

    Measured: Within one year of treatment

Secondary outcomes (8)
  1. Invasive disease-free survival in patients with resected moderate to high-anatomical risk, low-genomic risk, ER-positive, HER2-negative breast cancer

    iDFS is defined as the time from initiation of treatment to the first diagnosis of local invasive recurrence following mastectomy, local invasive recurrence in the ipsilateral breast following lumpectomy, regional recurrence, distant recurrence, contralateral invasive breast cancer, second non-breast primary cancer (excluding squamous or basal cell carcinoma of the skin), or death from any cause prior to recurrence or second primary cancer using STEEP criteria as assessed by investigator. iDFS using STEEP criteria, assessed separately in the participants who select to omit adjuvant chemotherapy (arm 1) and those who include adjuvant chemotherapy in their treatment regimen (arm 2).

    Measured: Defined as the time from initiation of treatment to three years post-survival

  2. Change from Baseline in Severity of Symptoms in patients with resected moderate to high-anatomical risk, low-genomic risk, ER-positive, HER2-negative breast cancer

    This seeks to assess the change from baseline in the severity of symptoms. This will be measured using the Functional Assessment of Cancer Therapy-General (FACT-G) GP5. FACT-G GP5 will be scored from scale of 0-4; with 0 indicating "not at all" and 4 indicating "very much". The objective is to describe patient-reported outcomes (PRO) for these measures in participants in arm 1 and arm 2.

    Measured: At baseline, every three months during the first year and every six months during years 2 and 3

  3. Change from Baseline in Physical Functioning and Global Health Status/Quality of Life in patients with resected moderate to high-anatomical risk, low-genomic risk, ER-positive, HER2-negative breast cancer

    This seeks to evaluate the change from baseline in the physical functioning sub-scale score and global health status/Quality of Life scale score of participants. This will be measured using the European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire Core 30 (EORTC QLQ-C30). This questionnaire is scored from 1 to 4; with 1 indicating 'not at all' and 4 indicating 'very much'. The objective is to describe patient-reported outcomes related to health-related quality-of-life in participants in arm 1 and arm 2.

    Measured: At baseline, every three months during the first year and every six months during years 2 and 3

  4. Factors Impacting Decision Making in Adjuvant Treatment Decisions in patients with resected moderate to high-anatomical risk, low-genomic risk, ER-positive, HER2-negative breast cancer

    This seeks to to identify and understand the factors that impact participants' decision-making processes, as assessed by a modified version of the Control Preferences Scale. This tool uses a card-sorting method, where participants are asked to rank five cards with different decision-making roles. It is then scored by the participant's preference order over the five cards. The objective is to explore the factors influencing the decision to include or omit adjuvant treatment among participants in arm 1 and arm 2. This assessment will help in understanding the preferences and considerations of patients regarding their treatment plans.

    Measured: At baseline

  5. Changes in fear of cancer recurrence in patients with resected moderate to high-anatomical risk, low-genomic risk, ER-positive, HER2-negative breast cancer

    This seeks to assess the changes in fear of cancer recurrence among participants, measured using the Fear of Cancer Recurrence-7 (FCR-7) scale. The first six items on the scale are scored on a 5-point scale, with 1 indicating "not at all" and 5 indicating "all the time". The seventh item assesses the extent to which Fear of Cancer Recurrence interferes with thoughts and activities on a 10 point scale, where 0 indicates "not at all" and 10 indicates "a great deal". The sale is then totaled; a score of less greater than 4 on items 1-6 or greater than 7 on item 7 suggests a significant level of fear of cancer recurrence. This evaluation aims to provide insights into the emotional and psychological impact of cancer treatment decisions.

    Measured: At baseline, six months, and one year

  6. Change from Baseline in Anxiety/Depression in patients with resected moderate to high-anatomical risk, low-genomic risk, ER-positive, HER2-negative breast cancer

    This seeks to assess the change from baseline in anxiety and depression of participants. This will be measured using the Patient Health Questionnaire-9 (PHQ-9). PHQ-9 will be scored from 0 to 3, with 0 indicating 'not at all' and 3 indicating 'nearly every day'. The scores will then be tallied, with scores ranging from 0-27, where higher scores will indicate greater depression severity. The objective is to describe patient-reported outcomes (PRO) for these measures in participants in arm 1 and arm 2.

    Measured: At baseline, every three months during the first year and every six months during years 2 and 3

  7. Changes in decision regret in patients with resected moderate to high-anatomical risk, low-genomic risk, ER-positive, HER2-negative breast cancer

    This seeks to assess the changes in decision regret among participants, measured using the Decision Regret Scale. This scale is scored from 1 to 5, where 1 indicates "strongly agree" and 5 indicates "strongly disagree". This evaluation aims to provide insights into the emotional and psychological impact of cancer treatment decisions

    Measured: At baseline, six months, and one year

  8. Change from Baseline in Severity of Symptoms in patients with resected moderate to high-anatomical risk, low-genomic risk, ER-positive, HER2-negative breast cancer

    This seeks to assess the change from baseline in the severity of symptoms. This will be measured using the Common Terminology Criteria for Adverse Events-Patient Reported Outcome (CTCAE-PRO). CTCAE-PRO will be scored from "none/not at all" to "very severe/severe". The objective is to describe patient-reported outcomes (PRO) for these measures in participants in arm 1 and arm 2.

    Measured: At baseline, every three months during the first year and every six months during years 2 and 3

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted1 May 2025
  2. Study start9 Jul 2025
  3. Primary completionSep 2030 (estimated)
  4. Study completionSep 2030 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
None (open label)
Enrolment
140 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06953882
Sponsor's protocol ID
2000038734
Other IDs
BCRF-23-184
Acronym
SELECT
Status last verified
May 2026
First submitted
1 Apr 2025
Last updated
26 May 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing Ribociclib 400mg, Letrozole 2.5mg and Anastrazole 1mg in people with HER2 Negative Breast Cancer, run by Yale University at 1 site in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 37 inclusion and 27 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 26 May 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Stephanie Ladd (954-895-0576, stephanie.ladd@yale.edu), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Discontinuation rate of ribociclib in patients with resected moderate to high-anatomical risk, low-genomic risk, ER-positive, HER2-negative breast cancer (time frame: Within one year of treatment). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 26 May 2026.

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