Cox-2, PKC-α, and P-gp expression levels of xenografts in different groups (×400).

A: expression of Cox-2 in mice xenografts B: expression of PKC-α in mice xenografts C: expression of P-gp in mice xenografts D: negative control E: xenograft by HE F: normal gastric tissue by HE. Tissues were fixed, embedded, mounted and stained by the SP method or HE staining using standard procedures. Scale bar, 25 µm.