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- W2212160778 abstract "The ability of tumor cells to adapt to therapeutic regimens by activating alternative survival and growth pathways remains a major challenge in cancer therapy. Therefore, the most effective treatments will involve interactive strategies that target multiple nonoverlapping pathways while eliciting synergistic outcomes and minimizing systemic toxicities. Nanoliposomal irinotecan is approved by the FDA for gemcitabine-refractory metastatic pancreatic cancer. However, the full potential of irinotecan treatment is hindered by several cancer cell survival mechanisms, including ATP-binding cassette G2 (ABCG2) transporter-mediated irinotecan efflux from cells. Here, we demonstrate that benzoporphyrin derivative-based photodynamic therapy (PDT), a photochemical cytotoxic modality that activates the apoptotic pathway, reduced ABCG2 expression to increase intracellular irinotecan levels in pancreatic cancer. Moreover, we show that PDT inhibited survivin expression. Although PDT potentiated irinotecan treatment, we also demonstrate that irinotecan reduced the tumoral expression of monocarboxylate transporter 4, which was upregulated by PDT. Notably, using orthotopic xenograft models, we demonstrate that combination of single low-dose PDT and a subclinical dose of nanoliposomal irinotecan synergistically inhibited tumor growth by 70% for 3 weeks compared with 25% reduction after either monotherapies. Our findings offer new opportunities for the clinical translation of PDT and irinotecan combination therapy for effective pancreatic cancer treatment." @default.
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- W2212160778 date "2016-02-29" @default.
- W2212160778 modified "2023-10-11" @default.
- W2212160778 title "Photodynamic Therapy Synergizes with Irinotecan to Overcome Compensatory Mechanisms and Improve Treatment Outcomes in Pancreatic Cancer" @default.
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- W2212160778 doi "https://doi.org/10.1158/0008-5472.can-15-0391" @default.
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