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NGF and MMP-2 levels correlated with the chondrosarcoma tumor stage. (A–E) Immunohistochemistry (IHC)-stained tissue samples from chondrosarcoma patients were stained with NGF and MMP-2 antibodies then photographed and quantified. (F) Levels of NGF and MMP-2 were positively correlated. * p < 0.05 compared with the early stage (IA and IB) tumor group.
