RESUMO
Objective High expression of multi-resistant transporter ATP-binding cassette super family G member 2 (ABCG2) is a major cause of drug resistance and chemotherapeutic failure of cancer .This study was to investigate the significance of ABCG2 expression in adrenocortical cancer cells after cyclophosphamide ( CTX) intervention in vivo . Methods Ten male and fe-male BALB/C-nu mice were randomly divided into a cyclophosphamide ( CTX) group and a control of equal number .SW-13 cells were subcutaneously injected into the nude mice to establish a model of subcutaneous transplantation tumor , followed by intraperitoneal injec-tion of CTX and isotonic saline solution into the two groups of mice , respectively .Then the expression of ABCG 2 in tumor tissue and primarily cultured cells was detected by immunohistochemistry and flow cytometry . Results The expression of ABCG 2 in the tumor tissue was significantly higher in the CTX than in the control group ([69.1 ±1.83]%vs [53.4 ±1.65]%, P<0.05), and so was that in the primarily cultured cells ([97.89 ±1.36]% vs [81.88 ±8.31]%, P<0.05). Conclusion The ABCG2 gene is in-volved in the drug resistance of adrenocortical carcinoma and may be a therapeutic target of the malignancy .