微信公众号

官网二维码

中国癌症防治杂志 ›› 2013, Vol. 5 ›› Issue (3): 201-210.doi: 10.3969/j.issn.1674-5671.2013.03.04

• 基础研究 • 上一篇    下一篇

广西地区乙肝病毒/黄曲霉毒素B1双暴露相关性肝细胞性肝癌微阵列比较基因组学的研究

  

  1. 1广西医科大学附属肿瘤医院肝胆外科;2广西医科大学第一附属医院超声诊断科;3广西医科大学第一附属医院肝胆血管外科
  • 出版日期:2013-09-25 发布日期:2013-10-10
  • 通讯作者: 黎乐群 E-mail:li_lequn@263.net
  • 基金资助:

    国家自然科学基金资助项目(30960021);广西自然科学基金资助项目(桂科基 0640101);广西科学研究与技术开发计划项目(桂科攻2011GXNSFD018032)

Array-based comparative genomic hybridization analysis of patients with hepatocellular carcinoma related to hepatitis B virus and aflatoxin B1 exposure in Guangxi, China

  • Online:2013-09-25 Published:2013-10-10

摘要: 目的  研究乙肝病毒/黄曲霉毒素B1双暴露相关性肝细胞性肝癌(hepatocellular carcinoma,HCC)染色体遗传学畸变的特点。方法 将32例手术切除经病理证实为HCC的癌组织,按照乙肝病毒与黄曲霉毒素的暴露情况分为4个亚组:A组为HBV(+)/AFB1(+)10例;B组为HBV(+)/AFB1(-)10例;C组为 HBV(-)/AFB1(+)6例;D组为HBV(-)/AFB1(-)6例。应用微阵列比较基因组杂交技术(Array CGH)检测分析其22对染色体DNA拷贝数的变化。结果 32例HCC样本中,共发现573个染色体畸变区段(chromosomal aberrations,CNAs)。其中 1q、4p、5p、6p、7p、8q、10p、17q、20p、20q 和X主要表现为扩增区段;1p、2q、4q、8p、9p、10q、11q、13q、14q、16p、16q、17p、19p、19q、21q、22q和Y主要表现为缺失区段。同时,共检测出25个染色体发生高频畸变的区段(recurrently altered regions,RARs),其中1q21.1-q44、5p13.2-p15.3、6p12.1-p25.2、7q11.2-q35、8q11.2-q24.3、17q12-q25.2、18q12.3-q22.3和X为高频率扩增区段,而1p31.1-p36.2、2q23.2-q37.2、4q12-q35.2、6q14.1-q26、8p12-p23.2、9p21.1-p24.2、10q21.3-q26.2、13q12.1-q21.1、14q21.3-q32.2、16p12.1-p13.2、16q12.1-q24.1、17p12-p13.3、19p13.1-p13.3、 19q13.2-q13.4、21q21.3-q22.2、22q11.2-q13.2和Y染色体为高频缺失区段。8p12-p23.2缺失的发生率在进展期HCC(TNM分期为Ⅲ~Ⅳ期)中明显高于早期HCC (TNM分期为Ⅰ~Ⅱ期)(P=0.038)。4q12-q35.2、13q12.1-q21.1的缺失及7q21.1-q35的扩增发生率在A组中最高。Cox模型分析结果示:在单因素分析中AFP水平、肿瘤大小、TNM分期、BCLC分期、侵袭与转移的发生、8p12-p23.2的缺失以及19p13.1-p13.3的缺失等为影响患者无瘤生存时间的危险因素(P<0.05)。而在多因素分析中AFP水平、TNM分期以及8p12-p23.2的缺失等为影响患者无瘤生存时间的危险因素(P<0.05)。结论 广西地区HCC染色体遗传学改变具有多样性,其中染色体19p13.1-p13.3的高频缺失可能为广西地区HCC特有的分子生物学特征之一。染色体8p12-p23.2的缺失可能为HCC的晚期事件,并且与患者的不良预后有关。染色体4q12-q35.2、13q12.1-q21.1缺失及7q21.1-q35扩增可能与HBV/AFB1双因素的协同致癌作用有关。

关键词:  肝肿瘤, 乙肝病毒, 黄曲霉毒素B1, 染色体, Array CGH

Abstract: Objective To investigate genetic changes in individuals that may influence development of hepatocellular carcinoma (HCC) associated with hepatitis B virus(HBV)and exposure to aflatoxin B1 (AFB1). Method Patients with HCC were divided into four groups based on HBV infection and AFB1 exposure status:HBV(+)/AFB1(+),n=10; HBV(+)/AFB1(-),n=10; HBV(-)/AFB1(+), n=6; HBV(-)/AFB1(-),n=6.Array-based comparative genomic hybridization(Array CGH) was carried out on tumor tissue to identify genome-wide genetic changes. Result Among all 32 tissue samples,573 CNAs were identified, comprising 184 gains and 389 losses. Frequent gains were observed in the following regions: 1q,4p,5p,6p,7p,8q,10p,17q,20p,20q and X.Frequent losses were observed in the following regions:1p,2q,4q,8p,9p,10q,11q,13q,14q,16p,16q,17p,19p,19q,21q,22q and Y.A total of 25 RARs were de-tected: 8 RAR gains were 1q21.1-q44,5p13.2-p15.3,6p12.1-p25.2,7q21.1-q35,8q11.2-q24.3,17q12-q25.2,18q12.3-q22.3 and X; 17 RARs losses were 1p31.1-p36.2,2q23.2-q37.2,4q12-q35.2,6q14.1-q26,8p12-p23.2,9p21.1-p24.2,10q21.3-q26.2,13q12.1-q21.1, 14q21.3-q32.2,16p12.1-p13.2,16q12.1-q24.1,17p12-p13.3,19p13.1-p13.3,19q13.2-q13.4,21q21.3-q22.2,22q11.2-q13.2 and Y.Loss of 8p12-p23.2 was associated with higher TNM tumor stage(TNM Ⅰ-Ⅱ: 38.9% vs TNM Ⅲ:92.9%;P=0.038) and shorter tumor-free survival (P=0.045).Loss of 4q13.3-q35.2 and 13q12.1-q21.2 and gain of 7q11.2-q35 occurred at higher frequency among HBV(+)/AFB1(+) patients than among the other groups. Univariate analysis found tumor-free survival to be associated with tumor size, serum AFP,BCLC,TNM stage,invasion and metastasis,and loss of 8p12-p23.2(all P<0.05).Multivariate analysis revealed three of these fac-tors to be independently associated with tumor-free survival:serum AFP(≥400),TNM stage, and loss of 8p12-p23.2(all P≤0.045). Conclusion Several chromosomal alterations were identified in the genomes of individuals with HCC in Guangxi.Loss of 19p13.1-p13.3 may be a characteristic feature of the disease in this part of China. Loss of 8p12-p23.2 may occur later during HCC progression and is associated with shorter tumor-free survival. Loss of 4q12-q35.2 and 13q12.1-q21.1 and gain of 7q21.1-q35 may be associated with the synergistic hepatocarcinogenic effect of HBV infection combined with AFB1 exposure.

Key words:  Liver neoplasms, Hepatitis B virus, Aflatoxin B1, Chromosome, Array CGH