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We hypothesized that use of a fully serotype 3 oncolytic adenovirus (Ad3-hTERT-CMV-hCD40L; TILT-234) could stimulate DCs in the prostate tumor microenvironment by expressing CD40L. Activated DCs would then activate cytotoxic T cells against the tumor, resulting in therapeutic immune responses. Oncolytic cell killing due to cancer cell-specific virus replication adds to antitumor effects but also enhances the immunological effect by releasing tumor epitopes for sampling by DC, in the presence of danger signals. In this study, we evaluated the companion effect of Ad3-hTERT-CMV-hCD40L and DC-therapy in a humanized mouse model and PC histocultures. Treatment with Ad3-hTERT-CMV-hCD40L and DC resulted in enhanced antitumor responses\n                    <jats:italic toggle=\"yes\">in vivo<\/jats:italic>\n                    . Treatment of established histocultures with Ad3-hTERT-CMV-hCD40L induced DC maturation and notable increase in proinflammatory cytokines. In conclusion, Ad3-hTERT-CMV-hCD40L is able to modulate an immunosuppressive prostate tumor microenvironment and improve the effectiveness of DC vaccination in PC models and patient histocultures, setting the stage for clinical translation.\n                  <\/jats:p>","DOI":"10.1089\/hum.2020.222","type":"journal-article","created":{"date-parts":[[2020,10,14]],"date-time":"2020-10-14T07:35:29Z","timestamp":1602660929000},"page":"192-202","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":27,"title":["Oncolytic Adenovirus Type 3 Coding for CD40L Facilitates Dendritic Cell Therapy of Prostate Cancer in Humanized Mice and Patient Samples"],"prefix":"10.1177","volume":"32","author":[{"given":"Sadia","family":"Zafar","sequence":"first","affiliation":[{"name":"Cancer Gene Therapy Group, Translational Immunology Research Program and Department of Oncology, University of Helsinki, Helsinki, 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