乳腺癌发生及其5年生存率与 bag-1基因的表达

背景bag-1是一种抗凋亡基因,其分泌蛋白是一种已经被确认的多功能结合蛋白.目前bag-1被认为可以作为早期诊断乳腺癌的一种生物标记,但其对乳腺癌预后的评估是否有意义?目的探讨抗凋亡基因bag-1在乳腺癌组织中的表达及与预后的关系.设计以乳腺癌、乳腺良性肿瘤及正常乳腺组织为研究对象的对照性实验.单位解放军第四军医大学西京医院血管内分泌外科.材料选择1995-05/2000-05手术切除的乳腺癌石蜡包埋组织块100例及2000-03/2000-05手术切除的10例乳腺良性肿瘤和10例正常乳腺组织石蜡标本作对照,以上均来自解放军第四军医大学西京医院病理科存档标本.方法采用免疫组化链霉素-抗生物素-生物素-过氧化酶复合物法观察100例乳腺癌与10例乳腺良性肿瘤及10例正常乳腺组织的石蜡标本切片中bag-1的表达.主要观察指标①乳腺癌、乳腺良性肿瘤及正常乳腺组织中bag-1表达水平.②不同bag-1表达水平乳腺癌患者的5年生存率.结果bag-1在乳腺癌组织中、乳腺良性肿瘤中、正常乳腺组织中阳性表达率分别为85%,10%,10%,差异有显著性(x2=29.98,P=000);在Ⅰ期、Ⅱ期、Ⅲ期的乳腺癌组织中bag-1阳性表达率分别为88%,82%,88%,差异无显著性(x2=0.61,P=0.75);在导管癌、小叶癌及特殊型癌中bag-1阳性表达率分别为86%,85%,80%,差异无显著性(x2=0.16,P=0.95).对94例获随访的乳腺癌患者中,bag-1阳性表达者5年生存率为79%,bag-1阴性表达者5年生存率为9%,两者差异有显著性(x2=0.07,P=0.04).结论bag-1在乳腺癌组织中高表达,bag-1在乳腺癌组织中的表达与肿瘤的临床分期,病理分型无关;bag-1可以作为乳腺癌预后的一个生物指标.

Effect of bag-1 expression on the occurrence of breast cancer and its 5-year survival rate

BACKGROUND: Bag-1 is a multifunctional and anti-apoptotic gene. Its anti-apoptotic ability is enhanced when binding to bcl-2 to form a complex.Now it is considered as a predictive biomarker for the early diagnosis of breast cancer. However, whether it is useful in the assessment of the prognosis of breast cancer is still elusive.OBJECTIVE: To explore the expression of bag-1 in breast cancer and its role for prognosis.DESIGN: A controlled study with breast cancer, benign breast tumor and normal breast tissues as subjects.SETTING: The Vascular and Endocrine Surgery Department of Xijing Hospital of the Fourth Military Medical University of Chinese PLA.MATERIALS:Totally 100 breast cancer specimens were obtained form May 1995 to May 2000. Ten benign breast tumor and 10 normal breast tissues were used as control. All the specimens were paraffin-embedded and came from the Pathological Department of Xijing Hospital Affiliated to Fourth Military Medical University of Chinese PLA.METHODS: Immunohostochemical strept avidin-biotin complex(SABC) method was adopted to detect bag-1 expression in these specimens.pression levels of bag-1.RESULTS: The positive expression rate of bag-1 in breast cancer (85%) was significantly different form those of benign breast tumor (10%) and normal breast (10%) (χ2= 29.98, P = 0.00). While the positive expression rates in breast cancer of different stages (stage Ⅰ, stage Ⅱ and stage Ⅲ ) were 88%, 82% and 88%, respectively, which has no significant difference (χ2 = 0. 61, P = 0.75) . In duct carcinoma, lobular carcinoma and special carcinoma, bag-1 positive expression rate was 86%, 85% and 80%,which was also no significantly different (χ2 =0.16, P =0.95). In the 94followed patients, the 5-year survival rate of positive bag-1 expression was 79% and that of negative bag-1 expression was just 9%. The difference was significant (χ2 = 0. 07, P = 0.04).CONCLUSION: High bag-1 expression exists in breast cancer and its level is not associated with the clinical stages or pathological types of the cancer.Therefore, bag-1 may be used as a predictive marker for the prognosis of breast cancer.