NHL cell lines express VEGF and VEGFR. (A) Representative results of immunohistochemistry staining for cytoplasmic VEGF in lymphoma cell cytospins. VEGF-positive control is on the top, and RL lymphoma cells are on the bottom (original magnification × 20). Results of (B) surface and (C) intracytoplasmic VEGFR expression as determined by flow cytometry on RL and SKI-DLBCL1 cells are shown.