M2 macrophages infiltrating epithelial ovarian cancer express MDR1: a feature that may account for the poor prognosis

Multi drug resistance protein 1 (MDR1) expression on tumor cells has been widely investigated in context of drug resistance. However, the role of MDR1 on the immune cell infiltrate of solid tumors remains unknown. The aim of this study was to analyze the prognostic significance of a MDR1+ immune cel...

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Main Authors: Badmann, Susann Daniela (Author) , Heublein, Sabine (Author) , Mayr, Doris (Author) , Reischer, Anna (Author) , Liao, Yue (Author) , Kolben, Thomas (Author) , Beyer, Susanne (Author) , Hester, Anna (Author) , Zeder-Goess, Christine (Author) , Burges, Alexander (Author) , Mahner, Sven (Author) , Jeschke, Udo (Author) , Trillsch, Fabian (Author) , Czogalla, Bastian (Author)
Format: Article (Journal)
Language:English
Published: 15 May 2020
In: Cells
Year: 2020, Volume: 9, Issue: 5
ISSN:2073-4409
DOI:10.3390/cells9051224
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3390/cells9051224
Verlag, lizenzpflichtig, Volltext: https://www.mdpi.com/2073-4409/9/5/1224
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Author Notes:Susann Badmann, Sabine Heublein, Doris Mayr, Anna Reischer, Yue Liao, Thomas Kolben, Susanne Beyer, Anna Hester, Christine Zeder-Goess, Alexander Burges, Sven Mahner, Udo Jeschke, Fabian Trillsch and Bastian Czogalla

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520 |a Multi drug resistance protein 1 (MDR1) expression on tumor cells has been widely investigated in context of drug resistance. However, the role of MDR1 on the immune cell infiltrate of solid tumors remains unknown. The aim of this study was to analyze the prognostic significance of a MDR1+ immune cell infiltrate in epithelial ovarian cancer (EOC) and to identify the MDR1+ leucocyte subpopulation. MDR1 expression was analyzed by immunohistochemistry in 156 EOC samples. In addition to MDR1+ cancer cells, we detected a MDR1+ leucocyte infiltrate (high infiltrate >4 leucocytes per field of view). Correlations and survival analyses were calculated. To identify immune cell subpopulations immunofluorescence double staining was performed. The MDR1+ leucocyte infiltrate was associated with human epidermal growth factor receptor 2 (HER2) (cc = 0.258, p = 0.005) and tumor-associated mucin 1 (TA-MUC1) (cc = 0.202, p = 0.022) expression on cancer cells. A high MDR1+ leucocyte infiltrate was associated with impaired survival, especially in patients whose carcinoma showed either serous histology (median OS 28.80 vs. 50.64 months, p = 0.027, n = 91) or TA-MUC1 expression (median OS 30.60 vs. 63.36 months, p = 0.015, n = 110). Similar findings for PFS suggest an influence of MDR1+ immune cells on the development of chemoresistance. A Cox regression analysis confirmed the independency of a high MDR1+ leucocyte infiltrate as prognostic factor. M2 macrophages were identified as main part of the MDR1+ leucocyte infiltrate expressing MDR1 as well as the M2 marker CD163 and the pan-macrophage marker CD68. Infiltration of MDR1+ leucocytes, mostly M2 macrophages, is associated with poor prognosis of EOC patients. Further understanding of the interaction of M2 macrophages, MDR1 and TA-MUC1 appears to be a key aspect to overcome chemoresistance in ovarian cancer. 
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