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Representative examples of P2X7 receptor (P2X7R) expression in gastric cancer specimens: (A) No staining (normal mucosa adjacent to tumor) (×200); (B) low-P2X7R expression of tumor cells (arrows) in a patient with early-stage (×400); (C) high-expression of P2X7R (×400) in a patient with advanced tumor, node, metastasis (TNM) stage. The high expression group showed intense cytoplasmic and membranous staining.
