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Figure 4: Ki-67 expression in tumor tissues (×400) from A549 cell transplanted nude mice. (a) Before administration, the positive cells with Ki-67 staining showed brown in the cell nucleus; (b) After 60 mmol/L gemcitabine treatment, the positive cells visibly decreased; (c) After 120 mmol/L gemcitabine treatment, showed no positive tumor cells

Figure 4: Ki-67 expression in tumor tissues (×400) from A549 cell transplanted nude mice. (a) Before administration, the positive cells with Ki-67 staining showed brown in the cell nucleus; (b) After 60 mmol/L gemcitabine treatment, the positive cells visibly decreased; (c) After 120 mmol/L gemcitabine treatment, showed no positive tumor cells