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Abstract: Objective. : To determine the efficacy of adjuvant platinum-based chemotherapy in Stage I uterine papillary serous carcinoma (UPSC). Methods. : A retrospective multi-institutional investigation was performed to identify surgically staged patients with Stage I UPSC who were (1) treated after surgery with 3–6 courses of platinum-based chemotherapy without radiation from 1990–2003, and (2) followed for a minimum of 12 months, or until recurrence. Results. : Six patients (IA—2, IB—3, IC—1) were treated with carboplatin (AUC 6) or cisplatin (50 mg/m2) alone. One patient recurred to the vagina, was treated with chemo-radiation, and is alive and well at 122 months. One patient recurred to the lung, liver, and brain, and died of disease at 24 months. The remaining 4 patients are alive with no evidence of disease 15–124 months (mean 62 months) after treatment. Two patients (IB-1, IC-1) were treated with cisplatin (50 mg/m2) and cyclophosphamide (1000 mg/m2), and both are alive and well with no evidence of disease 75 and 168 months after treatment. Twenty-one patients (IA—5, IB—13, IC—3) were treated with a combination of carboplatin (AUC 6) and paclitaxel (135 mg/m2–175 mg/m2). One patient recurred to the vagina after 3 cycles of carboplatin/paclitaxel, and was treated with chemo-radiation. She is now without evidence of disease 10 months after treatment. At present, all 21 patients with Stage I UPSC treated following surgical staging with carboplatin/paclitaxel chemotherapy are alive and well with no evidence of disease 10–138 months (mean 41 months) after treatment. Conclusion. : Combination carboplatin/paclitaxel chemotherapy following surgery is effective in the treatment of Stage I UPSC. [Copyright &y& Elsevier]