Basal cell carcinoma arising from xeroderma pigmentosum: A case report and an immunohistochemical study

Abstract

We describe a 26-year-old Japanese patient with basal cell carcinoma arising from xeroderma pigmentosum (XP). Immunohistochemical staining revealed dense infiltration of CD163+ M2 macrophages, together with Foxp3 + regulatory T cells. Interestingly, MMP9, which was reported as one of the functional markers for immunosuppressive macrophages, was al-so detected in the CD163+ M2 macrophage-infiltrated areas. Our case suggests the immunological background of tumor development in a patient with XP. © 2013 S. Karger AG, Basel.