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The purpose of this Phase I study was to determine the feasibility of using an anti-erbB-2-encoding adenovirus (Ad21) to treat erbB-2-overexpressing ovarian cancer. Recurrent ovarian cancer patients were treated i.p. with Ad21 in dosages ranging from 1 ×10⁹ to 1 × 10¹¹ pfu. Patients were monitored after treatment for evidence of clinical toxicity and efficacy. Peritoneal aspirates and serum samples were obtained to assess for evidence of gene transfer/expression, for generation of wild-type vector, and antiadenoviral humoral response. Fifteen patients were treated per study specifications. Treatment-specific grade 1/2 fever was ex-perienced by 9 of 15 (60%) patients. Other transient grade 1/2 constitutional, pain, and gastrointestinal symptoms were also experienced. No dose-limiting vector-related toxicity was experienced. Of 13 patients evaluable for response, 5 (38%) had stable disease and 8 (61%) had …