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Podoplanin, recognized by monoclonal antibody D2-40, may be a useful marker for follicular dendritic cell (FDC) tumors. Paraffin sections of 125 dendritic cell, histiocytic, and spindle cell lesions were studied, including 11 FDC tumors, 5 interdigitating dendritic cell tumors, 10 histiocytic sarcomas, 5 Langerhans cell histiocytosis, 5 sinus histiocytosis with massive lymphadenopathy, 5 inflammatory pseudotumors of lymph node or spleen, 9 nodal Kaposi sarcomas, 6 inflammatory myofibroblastic tumors (IMTs), 29 gastrointestinal stromal tumors (GISTs), and 10 cases each of malignant peripheral nerve sheath tumor, leiomyosarcoma, monophasic synovial sarcoma (SS), and solitary fibrous tumor. All FDC tumors and Kaposi sarcomas showed strong immunoreactivity for podoplanin (predominantly membranous). Podoplanin expression was only occasionally observed in the other tumor types, including 7 GISTs (24%), 2 IMTs (33%), and 3 SS (30%), and was generally weak and cytoplasmic. Reactivity for podoplanin was more common in spindle cell GISTs (5/13 [38%]) than in epithelioid or mixed-type GISTs (2/16 [13%]). Podoplanin is a highly sensitive marker for FDC tumors and may be useful to help confirm the diagnosis in conjunction with conventional FDC markers, particularly in the differential diagnosis of dendritic cell and histiocytic lesions.

Podoplanin (D2-40) Is a Novel Marker for Follicular Dendritic Cell Tumors