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Using FDG-PET/CT to Assess Response of Bone-Dominant Metastatic Breast Cancer, FEATURE Study

Cancer Type
Breast Cancer
Trial Phase
Phase II
18 Years and older, Male and Female
Study Type
Protocol IDs
EA1183 (primary)
Study Sponsor
ECOG-ACRIN Cancer Research Group


This phase II trial studies how well FDG-PET/CT works in assessing the response of patients with breast cancer that has spread to the bones or mostly to the bones (bone-dominant metastatic breast cancer). Diagnostic procedures, such as FDG-PET/CT, may work better in measuring breast cancer activity before and after treatment compared to other standard imaging tests.


I. Evaluate the performance of fludeoxyglucose F-18 (FDG)-positron emission tomography (PET)/computed tomography (CT) response criteria (modified PET Response Criteria in Solid Tumors [PERCIST] complete, partial and stable metabolic disease versus progressive metabolic disease) as a binary predictor of progression-free survival (PFS) in patients with bone-dominant (BD) metastatic breast cancer (MBC) treated with systemic therapy.

I. Evaluate the ability of FDG-PET/CT modified PERCIST criteria (complete versus [vs] partial vs stable vs metabolic progression) to independently predict PFS in patients with BD MBC.
II. Evaluate the ability of FDG-PET/CT modified PERCIST criteria (complete, partial, and stable versus progressive metabolic disease) to predict time to skeletal related events (SRE) and overall survival (OS) in patients with BD MBC.
III. Evaluate the ability of FDG-PET/CT metrics (percent change in peak standardized uptake value corrected for lean body mass (SULpeak), maximum standardized uptake value corrected for body weight (SUVmax) as continuous variables in index or up to 5 lesions) to predict PFS, time to SRE and OS in patients with BD MBC.
IV. Assess the utility of FDG-PET/CT to identify disease progression by identification of new lesions not identified by standard CT and bone scan.
V. Assess the ability of qualitative and quantitative changes in serial circulating tumor deoxyribonucleic acid (ctDNA) measures to predict PFS, time to skeletal related events (tSRE), and overall survival in patients.

I. Define criteria for selection of FDG-avid bone lesions for analysis based on thresholds for SULpeak or SUVmax.
II. In collaboration with National Cancer Institute (NCI) Quantitative Imaging Network (QIN), explore alternative methods for measuring metabolic response with FDG-PET/CT (e.g., total lesion glycolysis, quantitative total bone imaging, MD Anderson bone criteria, and radiomics) to predict clinical endpoints in patients with BD MBC.
III. Evaluate automated image analysis of FDG-PET/CT by AutoPERCIST.
IV. Determine if early metabolic changes in bone metastases assessed by FDG-PET/CT at 4 weeks after start of systemic therapy predict PFS and tSRE in patients with bone-only (BO) or BD MBC.
V. Evaluate the relationship between changes in ctDNA and metabolic response as assessed by FDG-PET/CT and to test the combined.

Patients receive FDG intravenously (IV) and undergo PET/CT scan over 15-30 minutes at baseline (within 21 days before start of standard systemic treatment) and at 12 weeks after start of standard systemic treatment in the absence of unacceptable toxicity. Patients also undergo blood sample collection throughout the study.

After completion of study, patients are followed up periodically for up to 3 years after study registration.


  1. Patient must be >= 18 years of age on the day of signing informed consent
  2. Patient must have an Eastern Cooperative Oncology Group (ECOG) performance (performance status [PS]) =< 2
  3. Patient must have radiographically confirmed metastatic breast cancer with histologic confirmation of either metastatic or primary tumor biopsy by local assessment that is hormone receptor positive by American Society of Clinical Oncology (ASCO)/College of American Pathologists (CAP) guidelines and with known HER2 status. * NOTE: Confirmation can be documented via a report from a metastatic biopsy; a separate biopsy does not need to be completed. If there is no report from a metastatic biopsy, the pathology report from primary breast cancer diagnosis documenting breast cancer along with estrogen receptor (ER), progesterone receptor (PR) and HER2 status can be utilized
  4. Patient must have radiologically confirmed bone-dominant (BD) or bone-only (BO) disease confirmed by scans obtained within 60 days prior to registration * BD is defined as disease involving bone with or without limited measurable metastases by Response Evaluation Criteria in Solid Tumors (RECIST) 1.1, with >= 1 non-irradiated bone metastasis on imaging ** NOTE: Limited measurable metastases include lymph nodes and the soft tissue components of lytic or mixed lytic/blastic bone metastases. Any number of lymph nodes =< 3 cm and up to 2 lymph nodes > 3 cm will be allowed. Up to 5 measurable soft tissue components of lytic or mixed lytic/blastic bone metastases will be allowed. Sites of radiation to bone lesions prior to enrollment must be recorded * BO is defined as detectable disease confined within the bone (any site, any number of lesions). Diagnosis requires abnormalities identified by imaging (bone scan or CT or PET/CT or magnetic resonance imaging [MRI]) with no other sites of metastases identified and with >= 1 non-irradiated bone metastasis on imaging
  5. Patient must have no contraindication to FDG-PET imaging which includes glucose values > 200 mg/dL and severe claustrophobia
  6. Patient must be newly starting one of the following systemic therapies: * Plan to receive either 1st, 2nd or 3rd line endocrine therapy for metastatic breast cancer. Endocrine therapy may include selective estrogen receptor modulators (SERMs), aromatase inhibitors, and/or fulvestrant that may be combined with Food and Drug Administration (FDA)-approved biologic agents(examples include CDK 4/6 inhibitors mTOR inhibitors and PARP inhibitors for gBRCA mutation) * Plan to receive chemotherapy or antibody drug conjugates per National Comprehensive Cancer Network (NCCN) or institutional standard * Plan to receive HER2-targeted therapy per ASCO, NCCN, and/or institutional guidelines as indicated for patients with HER2 positive disease * NOTE: The use of bone-stabilizing agents (bisphosphonates or denosumab) is permitted * NOTE: Dose modification of an existing treatment does not qualify as a new therapy
  7. Patient must meet institutional guidelines for renal function for MRI and CT scanning
  8. Patient must have life expectancy estimated at >= 24 weeks
  9. Patient must be participating in the trial at an institution which has agreed to perform the imaging research studies, completed the ECOG-American College of Radiology Imaging Network (ACRIN) defined PET/CT scanner qualification procedures and received ECOG-ACRIN PET/CT scanner approval
  10. Patient must complete the baseline (T0) FDG-PET within 28 days after registration. A FDG-PET/CT completed prior to registration may be used if all imaging parameters have been met and patient is able to start treatment within 21 days after completion of FDG/PET CT * For patients completing the baseline (T0) FDG-PET AFTER registration all parameters must be met * For patients who completed the baseline (T0) FDG-PET PRIOR to registration all parameters must be met with the following exemption: ** Pregnancy testing documentation prior to FDG-PET (T0 time point) for patients of childbearing potential will not be required

Treatment Sites in Georgia

Emory University Hospital - Midtown

550 Peachtree Street NE
Atlanta, GA 30308

Saint Joseph's Hospital of Atlanta

5665 Peachtree Dunwoody Road NE
Atlanta, GA 30342

Winship Cancer Institute of Emory University

1365 Clifton Road NE
Building C
Atlanta, GA 30322

**Clinical trials are research studies that involve people. These studies test new ways to prevent, detect, diagnose, or treat diseases. People who take part in cancer clinical trials have an opportunity to contribute to scientists’ knowledge about cancer and to help in the development of improved cancer treatments. They also receive state-of-the-art care from cancer experts... Click here to learn more about clinical trials.