The primary objective of this study is to estimate whether the addition of trastuzumab to paclitaxel and carboplatin chemotherapy improves progression free survival when compared to paclitaxel and carboplatin alone in Uterine Serous Papillary Carcinoma (USPC) patients overexpressing Her2/neu at 3+ level by immunohistochemistry (IHC)or positive by fluorescence in situ hybridization (FISH).
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Inclusion Criteria: * Patients must have advanced (stage III-IV) or recurrent histologically confirmed USPC with measurable disease. * Patients must harbor a tumor HER2/neu+ based upon IHC staining score of 3+ or 2+ with confirmed gene amplification by FISH Exclusion Criteria: * Patients with a history of other invasive malignancies, with the exception of non-melanoma skin cancers, significant history of cardiac disease, uncontrolled hypertension, unstable medical issue, brain leptomeningeal, prior therapy with trastuzumab, uncontrolled seizure disorder, seropositive for HIV, active hepatitis, hemorrhagic diathesis or requiring supplemental oxygen.