Radiation-enhanced therapeutic targeting of galectin-1 enriched malignant stroma in triple negative breast cancer
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Meenakshi Upreti1,3, Amar Jyoti1,3, Sara E. Johnson2, Elden P. Swindell4, Dana Napier3, Pallavi Sethi1,3, Ryan Chan1, Jonathan M. Feddock5, Heidi L. Weiss3, Thomas V. O’Halloran4, B. Mark Evers3,6
1Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, KY, USA
2Markey Cancer Center, University of Kentucky, Lexington, KY, USA
3Department of Pathology, University of Kentucky, Lexington,KY, USA
4Department of Chemistry, Chemistry of Life Processes Institute, Northwestern University, Evanston, IL, USA
5Department of Radiation Medicine, University of Kentucky Chandler Hospital, Lexington, KY, USA
6Department of Surgery, University of Kentucky, Lexington, KY, USA
Meenakshi Upreti, email: firstname.lastname@example.org
Keywords: galectin-1, triple negative breast cancer, stromal-targeting, TNBC tumor model, tumor tissue analog (TTA)
Received: February 18, 2016 Accepted: May 04, 2016 Published: May 19, 2016
Currently there are no FDA approved targeted therapies for Triple Negative Breast Cancer (TNBC). Ongoing clinical trials for TNBC have focused primarily on targeting the epithelial cancer cells. However, targeted delivery of cytotoxic payloads to the non-transformed tumor associated-endothelium can prove to be an alternate approach that is currently unexplored. The present study is supported by recent findings on elevated expression of stromal galectin-1 in clinical samples of TNBC and our ongoing findings on stromal targeting of radiation induced galectin-1 by the anginex-conjugated arsenic-cisplatin loaded liposomes using a novel murine tumor model. We demonstrate inhibition of tumor growth and metastasis in response to the multimodal nanotherapeutic strategy using a TNBC model with orthotopic tumors originating from 3D tumor tissue analogs (TTA) comprised of tumor cells, endothelial cells and fibroblasts. The ‘rigorous’ combined treatment regimen of radiation and targeted liposomes is also shown to be well tolerated. More importantly, the results presented provide a means to exploit clinically relevant radiation dose for concurrent receptor mediated enhanced delivery of chemotherapy while limiting overall toxicity. The proposed study is significant as it falls in line with developing combinatorial therapeutic approaches for stroma-directed tumor targeting using tumor models that have an appropriate representation of the TNBC microenvironment.
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