Bmi-1基因在甲状腺乳头状癌中的表达及意义

目的 分析Bmi-1基因在甲状腺疾病组织中的表达,探讨Bmi-1与甲状腺乳头状癌转移的相关关系及临床意义.方法 采用RT-PCR法检测8例正常甲状腺、18例结节性甲状腺肿、24例甲状腺乳头状癌组织中Bmi-1基因的表达,运用Fisher确切概率法分别对正常组、结甲组和甲癌组检验,判断Bmi-1在各组中的表达.结果①Bmi-1基因阳性表达在正常甲状腺中仅1例(12.5%),在结节性甲状腺肿中有3例(16.7%),而在甲状腺癌中有19例(79.2%),3组阳性率比较差异有统计学意义(P<0.05);②在24例甲状腺癌中,有淋巴结转移的16例(66.67%),无淋巴结转移的8例(33.33%),2组间比较差异有统计学意义(P<0.05);③以年龄为界,在19例阳性表达的甲状腺癌中,年龄≥45岁的12例(63.16%),<45岁的7例(36.8%),2组间比较差异有统计学意义(P<0.05).结论 ①研究证实Bmi-1基因在甲状腺癌中的阳性率明显高于良性甲状腺疾病和正常甲状腺组织;②Bmi-1的表达与淋巴结的转移及年龄有显著相关性,提示它对判断甲状腺乳头状癌的转移机制及预后有一定的临床价值.

Expression of Bmi-1 gene in papillary thyroid carcinoma

Objective To analyze expression of Bmi-1 gene in thyroid tissues and the relationship between Bmi-1 gene and metastasis of papillary thyroid carcinoma.Methods RT-PCR was used to detect expression of Bmi-1 in normal thyrroid tissues(8 eases),nodular goiters(18 cases)and papillary thyroid carcinomas (24 cases).The result was analyzed by Fisher exact propability test.Results Bmi-1 expression was detected only in 1 case(12.5%)in normal thyroid tissues group,3 cases(16.7%)in nodular goiters group,and 19 cases(79.2%)in papillary thyroid carcinoma group.The difference of Bmi-1 expression between the 3 groups had statistical significance(P<0.05).There were 16 cases of lymph node metastasis(66.67%)in the 24 cases of papillary thyroid carcinoma.The difference of Bmi-1 expression between cases with cervical lymph node metastasis and those without metastasis had statistical significance(P<0.05).Among the 19 thyroid carcinoma cases in which Bmi-1 expression was positive,12 eases(63.2%)were over45 years old,and 7 cases(36.8%)were under 45 years.The difference had statistical significance(P<0.05).Conclusions Expression of Bmi-1 gene in papillary thyroid carcinoma tissue is significantly higher than that in nodular goiters and normal thyroid tissues.Bmi-1 expression is closely relevant to lymph node metastasis and age,implying that Bmi-1 expression has clinical significance of distinguishing thyroid malignant tumors from benign diseases and it may provide clues to unravel the mechanism and prognosis of papillary thyroid carcinoma metastasis.