Testing a new scan to measure estrogen in breast tumors

This trial is testing a new imaging scan called ER PET/CT that can measure estrogen receptor status in breast cancer tumors. Currently, doctors use a tissue biopsy examined under a microscope to determine whether a tumor has estrogen receptors, but this method doesn't always work well for cancers that have spread to other parts of the body. The new scan may provide a better, less invasive way to see how much estrogen receptor is present in your tumor.

Knowing the exact estrogen receptor status of your cancer is crucial because it determines which treatments will work best for you. However, in up to 40% of patients, the estrogen receptor status can change between the original tumor and areas where cancer has spread, and the current biopsy method may miss this. This trial aims to develop a more accurate scanning method that could help doctors choose the right treatment for you.