Phase 2 Study of 18F-Fluoroestradiol PETCT Imaging to Assess Estrogen Receptor Activity in Women With Recurrent or Metastatic Uterine Cancer

What this Trial Is About

Researchers are evaluating the use of a new imaging method called 18Ffluoroestradiol FES PETCT to study estrogen receptor activity in women with recurrent, metastatic, or non-operated uterine cancer. This phase II study aims to understand how estrogen receptors are present in the cancer, which could help guide future research and treatments. The study involves women who are at least 18 years old and receiving care at the University of Pennsylvania. Participants will undergo up to two PETCT scans using the investigational FES tracer. The first scan is required and happens before starting a new therapy. Some patients may have a second optional scan if their disease progresses, to compare changes in estrogen receptor activity. The choice of therapy will remain with the treating doctor and will not be influenced by the scan results. Optional biopsies and blood samples may also be collected to study tumor cells and hormone levels. During the study, participants will have scans from the skull base to mid-thigh about 60 minutes after receiving the FES injection. Researchers will review standard imaging and clinical exams to evaluate cancer sites. Optional blood draws will analyze circulating tumor cells and hormone levels. The main outcome measured is the rate of FES positivity in estrogen receptor-positive uterine cancer over one year. Safety, progression, and changes in imaging and pathology will also be monitored. Participation may last up to several years as outcomes and progression are followed.

[18F]FES PET/.CT in Uterine Cancer