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- W2495957772 abstract "Immunotherapy is becoming a cornerstone in cancer treatment of many indications. So far, pancreatic cancer has shown little response to so called checkpoint blockade antibodies. However, animal data suggests that activating immunotherapies releases the effect of checkpoint blockade also in pancreatic cancer. The tumor microenvironment (TEM) supports the growth of the tumor cells and consists of stroma cells, fibroblasts, blood vessels and immune cells. In some tumor lesions, such as those in pancreatic cancer, the TEM is dense and comprises most of the lesion. The TEM regulates immune activity via its high content of M2 macrophages, myeloid derived suppressor cells and T regulatory cells. Further, the dysfunctional blood vessels in lesions are not optimal for recruiting lymphocytes. With these aspects in mind, LOAd703 was developed. LOAd703 is an oncolytic adenovirus carrying TEM modulators. LOAd703 was constructed from the ICOVIR system of oncolytic adenoviruses in which replication depends on a dysfunctional, hyperphosphorylated retinoblastoma pathway. The genome was further altered by removing E3-6.7K and gp19K, changing the serotype 5 fiber to a serotype 35 fiber to target CD46 expressed by most tumors, as well as by adding a CMV-driven transgene cassette with the human transgenes for TMZ-CD40L and 4-1BBL. Hence, the transgenes will be expressed in both tumor and stroma while oncolysis is initiated in the tumor cells. We demonstrate herein that LOAd703 infection of a panel of pancreatic cancer cell lines efficiently induced tumor cell death within 48-72 hrs post infection while LOAd703 infection of dendritic cells demonstrated an increased maturation of myeloid cells including dendritic cells (DCs). These DCs could in turn potently activate and promote expansion of both T- and NK cells. Further, LOAd703 infection of endothelial cells (HUVEC) induced upregulation of molecules involved in lymphocyte attachment, rolling and transmigration. In conclusion, LOAd703 is a novel oncolytic virus that targets both the tumor and its TME and a clinical trial is underway to elucidate its effect in pancreatic cancer. Citation Format: Angelica Loskog, Emma Eriksson, Ioanna Milenova, Rafael Moreno, Ramon Alemany. A novel oncolytic adenovirus expressing tumor microenvironment modulators that activates myeloid cells, lymphocytes and endothelial cells. [abstract]. In: Proceedings of the 107th Annual Meeting of the American Association for Cancer Research; 2016 Apr 16-20; New Orleans, LA. Philadelphia (PA): AACR; Cancer Res 2016;76(14 Suppl):Abstract nr 1474." @default.
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- W2495957772 date "2016-07-15" @default.
- W2495957772 modified "2023-10-06" @default.
- W2495957772 title "Abstract 1474: A novel oncolytic adenovirus expressing tumor microenvironment modulators that activates myeloid cells, lymphocytes and endothelial cells" @default.
- W2495957772 doi "https://doi.org/10.1158/1538-7445.am2016-1474" @default.
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