Abstract
e16502 Background: Even in responders of fertility-sparing hormone treatment for uterine endometrial carcinoma (EC) and atypical endometrial hyperplasia (AH) in young women, there have been high potential risks of later developed relapse. The aim of this study was whether changes in FDG and fluoroestradiol (FES) PET parameters following hormone treatment have the prognostic factor in prediction of later developed relapse. Methods: Eight young patients with EC and AH were treated by fertility-sparing treatment with a high-dose of medroxyprogesterone acetate (MPA) for 26 weeks. All patients underwent two FDG and FES-PET scans at baseline and 8 weeks after the beginning of MPA treatment, respectively. For each lesion, metabolic indices were calculated by standardized uptake values (SUV). All patients were followed up for 2 years. Values of FDG-SUV, FES-SUV and FES/FDG SUV ratio of tumors were retrospectively reviewed. The correlation between these parameters and clinical outcome of EC and AH for 2 years was evaluated. Results: An initial complete response was achieved in all patients. Two of 5 responders (40%) with AH and one of three (33%) responders with EC later developed (72-88weeks) relapse. One of those three patients underwent hysterectomy due to no response for additional MPA therapy. The tracer uptake of FDG and FES was decrease in all eight patients after 8 weeks. The FES/FDG ratio was increased in all three patients with later developed relapse, but the FES/FDG ratio was decrease in all patients without recurrence for 8 weeks. There was a significant difference of the change in FES/FDG ratio between later developed relapse patients and no relapse patients (0.113 vs -0.392; p = 0.044). Conclusions: This study suggests that an increase in the FES/FDG ratio after 8 weeks fertility-sparing hormone treatment with a high-dose of MPA may be a useful biomarker for predicting later developed relapse in EC and AH in young women.
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