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Efficacy with a Replication-selective Adenovirus Plus Cisplatin-based Chemotherapy: Dependence on Sequencing but not p53 Functional Status or Route of Administration

Onyx Pharmaceuticals, Richmond, California 94806 [C. H., M. L.], and Imperial Cancer Research Fund, Viral and Genetic Therapy Program, Imperial College School of Medicine, Hammersmith Hospital, London W12 OHS, United Kingdom [D. K.]

Replication-selective adenoviruses are being developed as novel anticancer therapeutics. Clinical trials with dl 1520, an E1B-M_r 55,000 gene-deleted adenovirus (ONYX-015), have demonstrated selective viral replication and biological activity in head and neck and ovarian carcinomas, but durable objective responses were not demonstrated. However, clinical results suggested potentially synergistic interactions with platinum-containing chemotherapy. To better characterize and optimize this interaction, we carried out combined modality treatment with ONYX-015 and cisplatin-based chemotherapy in three nude mouse-human tumor xenograft models with differing tumor locations or p53 functional status. Superior efficacy was demonstrated with combination therapy over either agent alone in all three models, independent of the route of ONYX-015 administration (intratumoral or i.p.). Virus replication was not demonstrably inhibited by cisplatin plus 5-fluorouracil chemotherapy. To assess the role of p53 function or cisplatin resistance in this interaction, we treated ovarian carcinomas that were matched except for p53 functional status (A2780, A2780/CP70). Combination therapy led to improved survival over either agent alone in both the p53(-) and the p53(+) carcinomatosis models. Efficacy was highly dependent on the sequencing of the agents; treatment with ONYX-015 prior to, or simultaneously with, chemotherapy was significantly superior to chemotherapy followed by ONYX-015. These results support further evaluation of replication-selective adenoviruses and cisplatin-based chemotherapy in clinical trials.

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