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Objective:This study was undertaken to assess the natural course of endometrial endometrioid carcinoma by identifying untreated patients and those with a prolonged ( > 6 months) treatment delay. Study design:A chart review of 252 patients with histologically confirmed endometrial endometrioid carcinoma was conducted and clinical data of untreated patients and those with a prolonged treatment delay were abstracted. Results:Seven patients (3 untreated and 4 with prolonged treatment delay) were identified. Five had clinical stage I and 5 had well differentiated tumors. The survival of the untreated patients ranged from 5 to 59 months. Of the patients with prolonged treatment delay,2 died more than 5 years after diagnosis and 2 are alive more than 5 years after diagnosis. Conclusion:The lengthy survival of our patients seems to indicate that the natural progression course,even in untreated patients,may be very slow in endometrial endometrioid carcinoma with favorable prognostic factors.