PROCEDURE
Biospecimen Collection
Undergo blood sample collection
Status
Recruiting
Phase
Phase 2
Enrollment
98
Locations
1
Results
Not posted
Publications
0
Study summary
This phase II trial determines if giving goserelin acetate injections in the upper gluteal region is as effective for ovarian function suppression (OFS) as giving injections in the abdomen for ovarian function suppression (OFS) in premenopausal patients with hormone receptor positive breast cancer that has not spread to other parts of the body (localized) or that has spread to nearby tissue or lymph nodes (locally advanced). Goserelin acetate is a drug used to treat prostate cancer, relieve the symptoms of advanced breast cancer, and treat problems with the endometrium (lining of the uterus). Goserelin acetate initially causes the pituitary gland to make more luteinizing hormone (LH) and follicle-stimulating hormone (FSH), temporarily increasing testosterone levels in men and estrogen levels in women. With continued use, goserelin acetate lowers the amount of LH and FSH the pituitary gland releases, leading to a drop in testosterone levels in men and estrogen levels in women. Goserelin acetate may stop the growth of cancer cells that need testosterone or estrogen to grow. It is a type of hormone therapy called a luteinizing hormone-releasing hormone (LHRH) agonist. Giving goserelin acetate injections in the upper gluteal region may be as effective for OFS as giving injections in the abdomen for OFS in premenopausal patients with localized or locally advanced hormone receptor positive breast cancer.
Interventions
PROCEDURE
Undergo blood sample collection
DRUG
Given SC
OTHER
Ancillary studies
Timeline
First posted
Mar 10, 2026
Study start
May 22, 2026
Primary completion
Sep 26, 2028
Study completion
Sep 26, 2029
Results posted
Not reported
Registry updated
Jul 8, 2026
Outcomes
Ovarian function suppression (OFS) maintenance
Time frame · 6 months
Failure to maintain OFS (yes; no) is defined as estradiol ≥ 10 pg/mL on two separate occasions. Will be based on calculating the within-arm sample proportion of patients for whom upper gluteal region administration of goserelin for 6 months failed to maintain OFS after switching from monthly abdominal administration of goserelin and corresponding upper bound of the one-sided 97.5% confidence interval (CI). Provided that the upper bound of the one sided 97.5% CI excludes 10%, the primary aim for that arm will have been met.
Provider-reported adverse events (AEs)
Time frame · Up to 1 year
Will be scored using the National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE), version 5.0. The maximum grade for each type of AE will be recorded for each patient and frequency tables will be reviewed to determine overall patterns.
Injection site preference
Time frame · Up to 1 year
Will be measured by single-question site preference survey (abdomen, upper gluteal region, no preference or unsure).
Eligibility
Inclusion Criteria: * REGISTRATION (STEP 1): Age ≥ 18 years and ˂ 50 years * REGISTRATION (STEP 1): Have histologically or cytologically confirmed, localized or locally advanced hormone positive breast cancer stage I-III (defined as ER Immunohistochemistry (IHC) \> 1%\] having completed curative intent therapy and clinically in remission * REGISTRATION (STEP 1): Currently receiving ovarian function suppression (OFS) with use of goserelin on a monthly basis in the abdomen and either aromatase inhibitor or tamoxifen for at least 6 months prior to study enrollment for treatment of hormone receptor positive breast cancer with plan to continue medical OFS for at least the next 12 months * REGISTRATION (STEP 1): Eastern Cooperative Oncology Group (ECOG) performance status (PS) 0, 1 or 2 * REGISTRATION (STEP 1): Provide written informed consent * REGISTRATION (STEP 1): Ability to complete questionnaire(s) by themselves or with assistance * REGISTRATION (STEP 1): Willingness to provide mandatory blood specimens for correlative research * REGISTRATION (STEP 1): Willing to return to enrolling institution for follow-up (during the active monitoring phase of the study) * REGISTRATION (STEP 1): Negative serum pregnancy test =\< 14 days prior to registration, and a negative urine pregnancy test =\< 7 days prior to randomization * REGISTRATION (STEP 1): Sexually active patients and their partners must use an effective method of contraception associated with a low failure rate prior to study entry and for the duration of study participation and for at least 3 months after the last dose of study drug. * Note: The following are considered effective contraceptives: oral contraceptive pill; condom plus spermicide; diaphragm plus spermicide; patient or partner surgically sterile; patient or partner more than 12 months postmenopausal; or injectable or implantable agent/device. Male patients should refrain from sperm donation and female patients should refrain from breastfeeding throughout this period * RANDOMIZATION (STEP 2): Completion of the lead-in treatment of 6 cycles of ovarian function suppression (OFS) with use of goserelin, with estradiol E2 value of ˂ 20 pg/mL and no back to back E2 levels \> 10 pg/mL after cycle 6 blood draw Exclusion Criteria: * REGISTRATION (STEP 1): Any of the following prior therapies: Chemotherapy =\< 6 months prior to registration. NOTE: concurrent receipt of human epidermal growth factor receptor 2 (HER2) directed antibodies or antibody-drug conjugates, endocrine therapy, or cyclin-dependent kinase (CDK) 4/6 inhibitor is permitted * REGISTRATION (STEP 1): Receiving any estrogen or progestin containing medications, including topical estrogens * REGISTRATION (STEP 1): Planning to temporarily or permanently discontinue medical OFS in the next 12 months
Study locations
United States. Showing up to 24 locations stored in the fast local snapshot.
Mayo Clinic in Rochester
Rochester, Minnesota, United States
Publications
No PMID-linked publications were present in this registry snapshot.
Related trials
National Cancer Institute (NCI) · Anatomic Stage III Breast Cancer AJCC v8 · Anatomic Stage IV Breast Cancer AJCC v8
Phase 3
Active, not recruiting
608
2026-07
ECOG-ACRIN Cancer Research Group · Prostate Carcinoma
Phase 3
Active, not recruiting
27
2026-07
RenJi Hospital · Prostate Cancer · Prostate
Phase 2
Not yet recruiting
200
2026-07
Washington University School of Medicine · Breast Cancer · Cancer of Breast
Phase 2
Recruiting
50
2026-07
Aristotle University Of Thessaloniki · Metabolic Dysfunction-Associated Steatotic Liver Disease · Nonalcoholic Fatty Liver
Phase 4
Active, not recruiting
62
2026-07
Mayo Clinic · Recurrent Castration-Sensitive Prostate Carcinoma · Recurrent Prostate Cancer
Phase 2
Recruiting
532
2026-07
Novartis · Early Breast Cancer
Phase 3
Recruiting
1,400
2026-07
Eli Lilly · Breast Neoplasms
Phase 2
Recruiting
600
2026-07
Related PeptideStat pages
Research pages describe evidence. Vendor pages, where available, describe independently tracked research-product listings and are not clinical recommendations.