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Histopathological assessment of multidrug resistance in gastric cancer: Expression of P-glycoprotein, multidrug resistance-associated protein, and lung-resistance protein

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Abstract

Because local recurrence is common after a curative resection for advanced gastric cancer, there has been significant interest in adjuvant chemotherapy. However, the overall effect of chemotherapy remains debatable regarding patients with advanced gastric adenocarcinoma. Multidrug resistance is thought to be a major cause of failure in cancer chemotherapy, and thus the expression of P-glycoprotein (P-Gp), multidrug resistance-associated protein (MRP), and lung-resistance protein (LRP) in tumor cells was evaluated by immunohistochemistry. In 20 gastric adenocarcinomas, 11 (55%), 2 (10%), and 0 (0%) were positive for MRP, LRP, and P-Gp. In malignant lymphomas, only 3 out of 10 cases were positive for MRP (30%). The positive rate of MRP staining was significantly higher in well and moderately differentiated adenocarcinomas (80%) than in poorly differentiated adenocarcinomas (20%). With regard to the degree of MRP expression and histological cell type, higher grades (grade 2–3) were observed only in well and moderately differentiated adenocarcinomas. In terms of the positive-stained cells and staining intensity, heterogeneity was observed in the staining profile of MRP. The proliferative cell nuclear antigen labeling index (PCNA LI) of MRP-positive and MRP-negative cases was 49.3%±11.6% and 49.4±6.9%, respectively. No correlation was observed between the MRP expression and PCNA LI. In conclusion, the incidence of MRP expression in gastric cancer was the highest in three different multidrug resistance-related epitopes. An evaluation of the MRP expression thus seemed to be beneficial for determining the optimal strategy of chemotherapy.

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Alexander, D., Yamamoto, T., Kato, S. et al. Histopathological assessment of multidrug resistance in gastric cancer: Expression of P-glycoprotein, multidrug resistance-associated protein, and lung-resistance protein. Surg Today 29, 401–406 (1999). https://doi.org/10.1007/BF02483030

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