Abstract
16α-[18F]Fluoro-17β-estradiol (FES) is an estrogen receptor (ER) ligand used for the detection of ER-positive malignant tumors such as breast cancer. We recently reported the feasibility of combined FES-and 2-[18F]fluoro-2-deoxy-D-glucose (FDG)-positron emission tomography (PET) scans for the differential diagnosis of endometrial tumors. ER expression measured by FES-PET was preserved in endometrial hyperplasia, whereas ERs were assumed to be reduced in endometrial carcinoma with accelerated glucose metabolism measured by FDG-PET. We report two postmenopausal patients under suspicion of endometrial carcinoma on the basis of cytology and/or magnetic resonance imaging (MRI), who were on tamoxifen treatment since undergoing surgery for breast cancer. Pelvic MRI suggested endometrial carcinomas, whereas FDG-and FES-PET showed no abnormal tracer accumulation. A postoperative histopathologic examination revealed that the lesions were endometrial hyperplasias with no malignant findings. FES-PET enables us to evaluate the ERα expression of endometrium noninvasively, whereas the evaluation of ER expression using FES-PET requires careful attention regarding the influence of hormonal therapy because tamoxifen greatly affects FES accumulation of even endometrial hyperplasia, which should be an FES-avid lesion.
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Tsujikawa, T., Okazawa, H., Yoshida, Y. et al. Distinctive FDG and FES accumulation pattern of two tamoxifen-treated patients with endometrial hyperplasia. Ann Nucl Med 22, 73–77 (2008). https://doi.org/10.1007/s12149-007-0075-2
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DOI: https://doi.org/10.1007/s12149-007-0075-2