Stereotactic Body Radiation Therapy and FES PET/CT Imaging for the Treatment of Oligoprogressive Estrogen Receptor Positive Metastatic Breast Cancer

Recruiting now · Phase 2

Conditions studied: Anatomic Stage IV Breast Cancer AJCC v8, Estrogen Receptor-Positive Breast Carcinoma, Metastatic Breast Carcinoma

In brief

This phase II trial tests how well stereotactic body radiation therapy (SBRT) works in treating patients with estrogen receptor positive (ER +) breast cancer that has spread from where it first started to other places in the body (metastatic) and has limited disease progression (oligoprogression). Currently, the standard of care for breast cancer patients with oligoprogressive disease is to change systemic therapy when progression occurs. Radiation therapy uses high energy x-rays, particles, or radioactive seeds to kill cancer cells and shrink tumors. SBRT is a type of external radiation therapy that uses special equipment to position a patient and precisely deliver radiation to tumors in the body (except the brain). The total dose of radiation is divided into smaller doses (fractions) given over several days. This type of radiation therapy helps spare normal tissue and has been shown to improve survival. SBRT may kill more tumor cells and allow patients with oligoprogressive ER + metastatic breast cancer to continue taking current systemic treatment. This trial also tests how well ER targeted positron emission tomography (PET)/ computed tomography (CT) imaging, using FES, works in identifying progressive disease in patients with ER + metastatic breast cancer. FES, a radiolabeled substance, binds to estrogen receptors and gives off radiation that can be detected by a PET scan. The PET scan, an established imaging technique that utilizes small amounts of radioactivity attached to very minimal amounts of tracer, FES, forms an image that shows where tumor cells with estrogen receptors can be found in the body. CT images use x-rays to provide an exact outline of organs. FES PET/CT may improve identification of progressive disease in patients with ER + metastatic breast cancer.

Key facts

Study ID: NCT06260033
Run by: City of Hope Medical Center
People needed: 18
Starts: 2024-07-23
Expected to finish: 2026-10-29
Last updated by the study team: 2025-10-06

Who can join

Age: 18 and older. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

Documented informed consent of the participant and/or legally authorized representative
Age: ≥ 18 years
Female or male
Eastern Cooperative Oncology Group (ECOG) ≤ 2
Ability to read and understand English or Spanish for questionnaires
Histologically confirmed ER+ (any progesterone receptor [PR] and human epidermal growth factor receptor 2 [HER2] status is allowed) metastatic breast cancer
The presence of metastatic breast cancer at the time of study entry with progression in 1-4 lesions (including new lesions). Patients that have disease progression in the breast and/or ipsilateral axilla will be considered to have only 1 site of progression even if multiple nodules/lymph nodes are present. Patients with progression in > 4 lesions are not allowed. Patients with current progression of malignant pleural effusions, malignant ascites, abdominal carcinomatosis, and/or lymphangitic pulmonary involvement are considered to have > 4 metastases (Note that patients with a history of these conditions earlier in the disease course with no evidence of progression of these conditions are eligible.)
Evidence of extracranial disease progression in 1-4 discrete lesions will be defined by either of the following:
Progression of disease by Response Evaluation Criteria in Solid Tumors (RECIST) version (v) 1.1 or PET Response Criteria in Solid Tumors (PERCIST) v 1.0 criteria OR
Progression of disease in at least 1 but up to 4 lesions as determined by the patient's treating oncologists such that the treating oncologist recommends changing to the next line systemic therapy. Note that a patient may not technically meet RECIST v 1.1 criteria for disease progression in this setting
SBRT must be feasible for all progressing lesions. Feasibility includes but is not limited to:
All progressing lesions must have distinct borders AND
Progressing lesions may not be located within 3 cm of previously irradiated critical structures such as the spinal cord, brachial plexus, brainstem, stomach, and/or small/large bowel that would render the metastasis unsafe to target with SBRT per the treating radiation oncologist
Patients with prior treated brain metastases that are stable are allowed. Patients must not have intracranial disease progression. Patients with prior or current leptomeningeal disease are not allowed
All progressing lesions must be amenable to stereotactic body radiation therapy to a dose of 30 Gy to 40 Gy in 3 to 5 fractions per the treating radiation oncologist
Women of childbearing potential (WOCBP): Negative urine or serum pregnancy test, If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required
Agreement by females and males of childbearing potential to use an effective method of birth control or abstain from heterosexual activity for the course of the study through at least 1 months after the last dose of protocol therapy.
Childbearing potential defined as not being surgically sterilized (men and women) or have not been free from menses for > 1 year (women only)

You may not qualify if…

Has received at least one line, but not more than three lines, of systemic therapy for metastatic disease
Patients may not have received chemotherapy, radiation therapy, biological therapy, immunotherapy, or other anti-cancer treatment within 7-14 days of the start of study therapy (SBRT) at the discretion of treating physician. Chemotherapy must be held during study therapy and can resume 7-14 days after completion of all study therapy (SBRT) at the discretion of treating physician. (Patients may continue anti-endocrine/hormone therapy before, during and after study therapy at the discretion of the treating medical oncologist.)
Clinically significant uncontrolled illness such that the patient is no longer a candidate for systemic therapy
Prior or concurrent malignancy. Prior malignancies with a low probability of recurrence requiring treatment such as the following are allowed: carcinoma in situ of the cervix, non-melanoma skin cancer, and low grade (Gleason score ≤ 6 = Gleason group 1) localized prostate cancer. Prior malignancies not listed require principal investigator (PI) approval
Patients that have only liver metastases will not be allowed
Females only: Pregnant or breastfeeding
Any other condition that would, in the Investigator's judgment, contraindicate the patient's participation in the clinical study due to safety concerns with clinical study procedures
Prospective participants who, in the opinion of the investigator, may not be able to comply with all study procedures (including compliance issues related to feasibility/logistics)

Where it is running

City of Hope Medical Center — Duarte, California, United States (enrolling)
City of Hope at Irvine Lennar — Irvine, California, United States (enrolling)

Full record on ClinicalTrials.gov

Trial information comes from ClinicalTrials.gov and is refreshed daily. TrialsForMe does not provide medical care and does not run the studies it lists.