Figure 5From: Dedifferentiated chondrosarcoma of the cervical spine: a case reportIn the immunohistochemical analysis, the cartilaginous components were positive for S-100 protein, but the spindle cell areas were negative (a) (x100). (bcp (x100) Ki-67 antigen, a marker of cell proliferation, was increased in the spindle cell areas, while it was absent in the cartilaginous component.Back to article page