위선암에서 조직면역학적 방법을 이용한 P-glycoprotein의 분포에 관한 연구 = An Immunohistochemical Study for Distribution of P-glycoprotein in Gastric Adenocarcinoma

다국어 초록 (Multilingual Abstract)

P-glycoprotein, as a pleotropic membrane transport protein, shows specific localization in many normal tissue and malignant tumor. It act as an energy dependent drug pump in malignant tumors and makes difficulty for treating these tumors with anticancer drugs. Many malignant tumors such as colon carcinoma, renal cell carcinoma, hepatoma, islet cell tumor of pancreas, and adrenal cortical carcinoma, show high expression of P-glycoprotein and resistance to chemotherapy. However reports for P-glycoprotein in gastric adenocarcinoma is rare. The difference of its expression according to differentiation of gastric adenocarcinoma has been studied and its results are controversial. To observe the relationship of P-glycoprotein positivity according to differentiation of carcinoma, age and sex, adenocarcinoma 82 cases and dysplastic lesions 12 cases were analysed then processed for immunohistochemical stain by avidin-biotin complex using mAB JSB-1.
The results were as followings :
1. Positive rate of P-glycoprotein in gastric adenocarcinoma and dysplastic lesions were 48.78%(40/82) and 50%(6/12).
2. Well, moderate and poorly differentiated adenocarcinoma showed positive reaction of P-glycoprotein in 51.28%(20/39), 46.43%(13/28) and 46.67%(7/15) respectively.
3. Positive reaction of P-glycoprotein in male was 53.85%(35/65) and female in 29.41%(5/7) which indicate high positive rate in male.
4. Positive rate of P-glycoprotein according to age distribution were 25%(1/4) in 20-30 decade, 42.8%(6/14) in 40 decade, 44.83%(13/29) in 50 decade, 57.14(12/21) in 60 decade and 57.14%(8/14) in 70 decade. It indicate that P-glycoprotein positivity is increased with age.
The above results reveal that the expression of p-glycoprotein in gastric adenocarcinoma as related with sex and age but not with differentiation of carcinoma. These results implies that P-glycoprotein may be implicated with hormone dependent.