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Ki-67 expression in osteosarcoma (OS) with and without pulmonary metastasis (x400). Representative images of (a) H&E staining for OS tissues without pulmonary metastasis; (b) IHC staining for Ki-67 in OS tissues without pulmonary metastasis; (c) H&E staining for OS tissues with pulmonary metastasis and (d) IHC staining for Ki-67 with pulmonary metastasis. H&E, hematoxylin and eosin; IHC, immunohistochemistry.
