【摘要】 目的 探讨宫颈癌组织中脾酪氨酸激酶(Syk)基因启动子甲基化程度及其临床意义。方法 采用甲基化特异性PCR(MSP)方法检测60例宫颈癌、50例宫颈上皮内瘤变(CIN)和20例正常宫颈组织中Syk基因启动子甲基化情况。结果 宫颈癌组织中Syk基因启动子甲基化率明显高于CIN组织及正常宫颈组织(χ2=17.13、19.71,P<0.05);Syk基因甲基化程度在宫颈癌组织中的表达与肿瘤淋巴结转移有明显相关性(χ2=10.22,P<0.01),但与病人年龄、肿瘤大小、临床分期、组织学类型及病理类型无明显相关性(P>0.05)。结论 Syk 基因启动子甲基化可能与宫颈癌发生及其淋巴转移有关。
【关键词】 宫颈肿瘤;脾酪氨酸激酶;DNA甲基化
METHYLATION OF Syk GENE PROMOTER IN CERVICAL CANCER SUN GUIXIA, ZHAO SHUPING, MA DEHUA, et al (Department of Obstetrics and Gynecology, The Affiliated Hospital of Qingdao University Medical College, Qingdao 266003, China); [ABSTRACT] Objective To explore the methylation of spleen tyrosine kinase Syk gene promoter and its clinical significance in cervical cancer. Methods Using methylationspecific PCR technique, specimens from 60 cervical cancer patients, 50 cervical intraepithelial neoplasia (CIN) patients, and 20 normal cervical tissue were detected for methylation of Syk promoter. ResultsThe methylation rate of Syk gene in cervical cancer tissue was significantly higher than that in CIN and normal cervical tissue (χ2=17.13,19.71;P<0.05). The methylation of Syk gene in the cancer tissue was markedly correlated with lymph node metastasis(χ2=10.22,P<0.01), but not associated with patients’ age, size of tumor, clinical stage, types of histology and pathology (P>0.05). Conclusion Methylation of Syk gene promoter may be correlated with oncogenesis and lymph node metastasis of cancer of the cervix.
[KEY WORDS] Uterine cervical neoplasms; Spleen tyrosine kinase;;DNA methylation
宫颈癌是妇科最常见的恶性肿瘤,发病率呈升高和低龄化趋势,严重威胁妇女的生命健康。近年来的研究结果显示,肿瘤的发生是多因素共同作用的结果,其中原癌基因激活和(或)抑癌基因失活起重要作用。在细胞的信号传导途径中,脾酪氨酸激酶(Syk)起着很重要的作用,Syk基因是一种新发现的候选抑癌基因, Syk基因的失表达与肿瘤的侵袭性密切相关[1~3]。但目前有关Syk基因表达及其启动子甲基化与宫颈癌发生、发展关系的研究尚未见报道。本实验采用甲基化特异性PCR(MSP)方法检测宫颈癌组织中Syk基因启动子甲基化状态,以探讨Syk启动子甲基化在宫颈癌发生发展中作用及意义。
1 材料和方法
1.1 标本来源
选取2005年8月~2007年8月在我院妇科行宫颈癌根治性切除的60例宫颈癌标本。病人年龄22~70岁,平均43岁。按照FIGO(2000年)分期:ⅠA2期10例,ⅠB1期20例,ⅠB2期15例,ⅡA期15例;术后病理证实有淋巴结转移者23例,无淋巴结转移者37例;病理分级:G1者17例,G2者29例,G3者14例;病理类型:鳞癌38例,腺癌22例;肿瘤直径≤4.0 cm者30例,>
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