L F Sandvik1,2, K Skarstein3, B Krynitz4, R Volchenkov1, L Sviland3,5, T Leivestad6, R Jonsson1, S Appel1. 1. Broegelmann Research Laboratory, Department of Clinical Science, University of Bergen, Bergen, Norway. 2. Department of Dermatology, Haukeland University Hospital, Bergen, Norway. 3. Section for Pathology, Department of Clinical Medicine, University of Bergen, Bergen, Norway. 4. Department of Pathology and Cytology, Karolinska University Laboratories, Stockholm, Sweden. 5. Department of Pathology, Haukeland University Hospital, Bergen, Norway. 6. The Norwegian Renal Registry, Department of Transplantation Medicine, Oslo University Hospital Rikshospitalet, Oslo, Norway.
Abstract
BACKGROUND: Renal transplant recipients (RTR) have an increased risk of developing cutaneous squamous cell carcinomas (SCC). These SCC are often more aggressive than SCC in immunocompetent individuals. OBJECTIVES: In this comparative study, we analysed the cell composition in the tissue immediately surrounding invasive SCC in immunosuppressed RTR and immunocompetent controls in an effort to further elucidate the role of the local immune system. METHODS: Morphology and quantity of various dendritic cell (DC) subsets, macrophages and FoxP3+ T cells were analysed by immunohistochemical staining. RESULTS: The number of CD11c+ myeloid DC and FoxP3+ T cells was significantly reduced in RTR, whereas the number of plasmacytoid DC, Langerhans cells and macrophages was similar in RTR and controls. CONCLUSIONS: A reduction in CD11c+ mDC in peritumoral dermis in RTR might contribute to impaired immunosurveillance thus giving rise to an increased risk to develop aggressive SCC in these patients.
BACKGROUND: Renal transplant recipients (RTR) have an increased risk of developing cutaneous squamous cell carcinomas (SCC). These SCC are often more aggressive than SCC in immunocompetent individuals. OBJECTIVES: In this comparative study, we analysed the cell composition in the tissue immediately surrounding invasive SCC in immunosuppressed RTR and immunocompetent controls in an effort to further elucidate the role of the local immune system. METHODS: Morphology and quantity of various dendritic cell (DC) subsets, macrophages and FoxP3+ T cells were analysed by immunohistochemical staining. RESULTS: The number of CD11c+ myeloid DC and FoxP3+ T cells was significantly reduced in RTR, whereas the number of plasmacytoid DC, Langerhans cells and macrophages was similar in RTR and controls. CONCLUSIONS: A reduction in CD11c+ mDC in peritumoral dermis in RTR might contribute to impaired immunosurveillance thus giving rise to an increased risk to develop aggressive SCC in these patients.