Recent Advances in Imaging Steroid Hormone Receptors in Breast Cancer.

Kumar, Manoj; Salem, Kelley; Tevaarwerk, Amye J; Strigel, Roberta M; Fowler, Amy M · J Nucl Med · 2020

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Abstract

Estrogen receptor (ER) and progesterone receptor (PR) are important prognostic and predictive biomarkers in breast cancer. PET using ER- and PR-specific radioligands enables a whole-body, noninvasive assessment of receptor expression. Recent investigations of ER imaging with <sup>18</sup>F-fluoroestradiol have focused on diagnosing ER-positive metastatic disease, optimizing ER-targeted drug dosage, and predicting endocrine therapy benefit. Studies of PR imaging with <sup>18</sup>F-fluorofuranyl norprogesterone have investigated how imaging changes in PR expression as a downstream target of ER activation may reflect an early response to ER-targeted therapy. This focused review highlights recent achievements in preclinical and clinical imaging of ER and PR in breast cancer.

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