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[18F]Fluoroestradiol Imaging of Invasive Lobular Carcinoma Using PET/CT

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT04252859
Recruitment Status : Not yet recruiting
First Posted : February 5, 2020
Last Update Posted : February 6, 2020
Information provided by (Responsible Party):
University of Utah

Brief Summary:
FES PET/CT imaging for invasive lobular cancer

Condition or disease Intervention/treatment Phase
Invasive Lobular Breast Carcinoma Drug: [18F]Fluoroestradiol (FES) PET/CT Early Phase 1

Detailed Description:

According to the National Comprehensive Cancer Network (NCCN) 2018 guidelines FDG-PET/CT may be performed as an alternative to a contrast-enhanced CT of the chest, abdomen and pelvis and Tc-99m MDP bone scan for evaluation of distant metastatic disease in newly diagnosed stage III breast cancer patients. FDG-PET/CT is usually not obtained for stage I or stage II breast cancer patients. Prior studies have demonstrated FDG-PET/CT can identify sites of unsuspected metastatic disease in newly diagnosed breast cancer patients thereby altering treatment decisions given that palliative management is typical for stage IV disease, whereas neoadjuvant therapy followed by surgery and postoperative radiation may be considered for stage II and operable stage III disease. These guidelines consider invasive breast cancer as a single entity and do not consider whether tailoring imaging techniques for subtypes of breast cancer may be beneficial. However, prior research suggests that FDG-PET/CT may be more appropriate as an alternative to CT and bone scan for patients with invasive ductal carcinoma (IDC) rather than invasive lobular carcinoma (ILC) as FDG demonstrates comparatively reduced sensitivity for ILC metastases. Compared to IDC, ILC is more often occult on mammography, ultrasound, and FDG-PET/CT; which is of importance for clinical management as ILC is more often multifocal and bilateral compared to IDC. Clinical breast examination also has lower sensitivity for detection of ILC compared to IDC, even for large tumors, as ILC may be indistinguishable from normal breast tissue on palpation.

A prior study evaluating systemic staging of newly diagnosed patients with stage I-III invasive breast cancer found that FDG-PET/CT is 1.98 times less likely to reveal unsuspected distant metastatic disease for women with ILC compared to IDC. In this study, all IDC metastases demonstrated FDG avidity whereas 25% of ILC metastases (3 of 12) were not FDG avid. Detection of local axillary metastatic disease on FDG-PET/CT was also lower for ILC (0 of 146 patients) compared to IDC (7 of 89 patients) despite data from the Surveillance, Epidemiology and End Results (SEER) database demonstrating similar rates for lymph node metastases between IDC and ILC. Another study evaluating FDG-PET/CT for the diagnosis of primary breast cancer found that the false negative rate for detection of ILC by FDG was 65% (15 of 23 cases) compared to 23% for IDC (23 of 97 cases) when matching for tumors of the same size. A final study reported a false negative rate of FDG for ILC detection of 13% (2 of 15 patients). Mechanistically, ILC may not take up FDG as avidly as IDC due to lower tumor microvascularity, cellular density, proliferation rate, and number of GLUT transporters. ILC osseous metastatic disease is also more frequently occult on FDG-PET/CT compared to IDC as ILC osseous metastases are more frequently sclerotic, whereas FDG-PET/CT is more sensitive for lytic osseous metastases. Sclerotic ILC osseous metastases also may be indistinguishable from benign bone islands on CT at initial staging, thereby necessitating biopsy or imaging follow-up for confirmation of osseous metastatic disease. Improved imaging strategies for primary and metastatic ILC are therefore warranted.

Multiple studies have proven the efficacy of FES-PET/CT for imaging evaluation of ER+ invasive breast malignancy (evaluating both IDC and ILC together, with the large majority of cases comprising IDC) but, to our knowledge, no prior study has focused FES-PET/CT evaluation only to cases of ILC, nor have prior studies compared FES-PET/CT directly with FDG-PET/CT for evaluation of newly diagnosed ILC. Given that all prior studies on FES-PET/CT have grouped a small number of ILC cases with a larger number of IDC cases, the imaging performance of FES-PET/CT specifically for ILC is unknown. ILC demonstrates higher rates of ER positivity than IDC with prior studies showing greater than 90% positivity for cases of ILC. Data from the SEER database also shows ILC demonstrates higher overall expression of ER than IDC (ILC 95% positive for ER, n=17,503 vs IDC 74% positive for ER, n=172,379). FES may therefore be suitable for imaging evaluation of a high proportion of patients with ILC.

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 24 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Intervention Model Description: Pilot trial
Masking: None (Open Label)
Primary Purpose: Diagnostic
Official Title: [18F]Fluoroestradiol Imaging of Invasive Lobular Carcinoma Using PET/CT
Estimated Study Start Date : June 2020
Estimated Primary Completion Date : June 2022
Estimated Study Completion Date : June 2023

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: All Participants
One session of [18F]FES PET/CT Imaging
Drug: [18F]Fluoroestradiol (FES) PET/CT
[18F]Fluoroestradiol (FES) PET/CT for invasive lobular carcinoma (ILC)

Primary Outcome Measures :
  1. Positive detection rate of invasive lobular carcinoma (ILC) [ Time Frame: At time of imaging ]
    Hypothesize that FES-PET/CT will detect at least 80% of histologically proven primary ILC estrogen receptor positive (ER+) tumors.

Secondary Outcome Measures :
  1. Rate of estrogen receptor positive (ER+) ILC that does not demonstrate positive FES uptake [ Time Frame: At time of imaging ]
    FES-PET/CT concordance with ER status from biopsy and presence of inter-tumoral ER heterogeneity. Focal uptake above background with SUV max of 1.5 or greater

  2. Rate of estrogen receptor negative (ER-) ILC that does demonstrate positive FES uptake [ Time Frame: At time of imaging ]
    FES-PET/CT concordance with ER status from biopsy and presence of inter-tumoral ER heterogeneity. Focal uptake above background with SUV max of 1.5 or greater

  3. Rate of same-patient (inter-tumoral) heterogeneous FES uptake [ Time Frame: At time of imaging ]
    FES-PET/CT concordance with ER status from biopsy and presence of inter-tumoral ER heterogeneity. Focal uptake above background with SUV max of 1.5 or greater. Presence of FES uptake with SUV max of 1.5 or greater in some but not all biopsy proven or suspected metastatic lesions

  4. Evaluate the rate of discordant uptake (FES positive/FDG negative or FES negative/FDG positive) [ Time Frame: At time of imaging ]
    Differences between FDG- and FES PET/CT uptake. Discordant uptake will be evaluated for biopsy proven primary, any proven or suspected local nodal (axillary, intramammary, internal mammary, supraclavicular) and any proven or suspected distant metastatic lesions.

  5. Evaluate the correlation of lesion uptake between FES and FDG. [ Time Frame: At time of imaging ]
    Differences between FDG- and FES PET/CT uptake for cases with both FDG- and FES-PET/CT imaging,

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Adults aged 18 years or greater
  • All patients or legal guardains are willing and able to sign a written informed consent and HIPAA authorization in accordance with local and institutional guidelines.
  • Histologically confirmed invasive lobular carcinoma within the past 12 weeks confirmed from biopsy of primary tumor or metastasis.
  • Patient is willing to have their clinical records reviewed for at least 24 months after enrollment.

Exclusion Criteria:

  • Patients with known allergic or hypersensitivity reactions to previously administered radiopharmaceuticals. Patients with significant drug or other allergies or autoimmune diseases may be enrolled at the Investigator's discretion.
  • Patients who require monitored anesthesia for PET/CT scanning.
  • Patients who are too claustrophobic to undergo PET/CT scanning.
  • Pregnancy or current breast feeding.
  • Patient is not medically unstable defined as patient requiring inpatient hospitalization or needing evaluation at an acute care or urgent care facility at time of imaging.
  • Patients undergoing treatment with estrogen receptor agonists (such as fulvestrant and tamoxifen) within 5 weeks of the FES-PET/CT scan. (Note that aromatase inhibitors and luteinizing hormone-releasing hormone agonists do not affect ER expression, or binding of FES to ER, and do not need to be discontinued or considered for inclusion or exclusion of patients).
  • Patient who have had the site(s) of biopsy proven invasive lobular carcinoma surgically resected.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT04252859

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Contact: Paige Nielsen 801-585-5942
Contact: Matthew Covington, MD 801-585-5942

Sponsors and Collaborators
University of Utah
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Principal Investigator: Matthew Covington, MD Huntsman Cancer Institute/ University of Utah
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Responsible Party: University of Utah Identifier: NCT04252859    
Other Study ID Numbers: HCI128055
First Posted: February 5, 2020    Key Record Dates
Last Update Posted: February 6, 2020
Last Verified: January 2020

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Product Manufactured in and Exported from the U.S.: No
Additional relevant MeSH terms:
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Breast Neoplasms
Carcinoma, Lobular
Neoplasms, Glandular and Epithelial
Neoplasms by Histologic Type
Neoplasms by Site
Breast Diseases
Skin Diseases
Neoplasms, Ductal, Lobular, and Medullary