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Prediction of early-stage hepatocellular carcinoma using Onco Scan chromosomal copy number aberration data

World Journal of Gastroenterology 2017年第44期23卷 7818-7829页

作者： Ming-Chin Yu Chao-Wei Lee Yun-Shien Lee Jang-Hau Lian Chia-Lung Tsai Yi-Ping Liu Chun-Hsing Wu Chi-Neu Tsai Department of Surgery Chang Gung Memorial Hospital Department of Surgery Xiamen Chang Gung Hospital Graduate Institute of Clinical Medical Sciences Chang Gung University Genomic Medicine Core Laboratory Chang Gung Memorial Hospital Department of Biotechnology Ming-Chuan University Department of Pediatrics Chang Gung Memorial Hospital

AIM To identify chromosomal copy number aberrations(CNAs) in early-stage hepatocellular carcinoma(HCC) and analyze whether they are correlated with patient *** One hundred and twenty patients with early-stage HCC were enrolled in our study, with the collection of formalin fixed, paraffin-embedded(FFPE) specimens and clinicopathological data. Tumor areas were marked by certified pathologists on a hematoxylin and eosinstained slide, and cancer and adjacent non-cancerous tissues underwent extraction of DNA, which was analyzed with the Affymetrix Onco Scan platform to assess CNAs and loss of heterozygosity(LOH). Ten individuals with nonmalignant disease were used as the control group. Another cohort consisting of 40 patients with stage Ⅰ/Ⅱ HCC were enrolled to analyze gene expression and to correlate findings with the Onco Scan *** copy number amplifications occurred at chromosomes 1 q21.1-q44 and 8 q12.3-24.3 and deletions were found at 4 q13.1-q35.2, 8 p 23.2-21.1, 16 q23.3-24.3, and 17 p13.3-12, while LOH commonly occurred at 1 p32.3, 3 p21.31, 8 p23.2-21.1, 16 q22.1-24.3, and 17 p 13.3-11 in early-stage HCC. Using Cox regression analysis, we also found that a higher percentage of genome change(≥ 60%) was an independent factor for worse prognosis in early-stage HCC(P = 0.031). Among the 875 genes in the Onco Scan Gene Chip, six were independent predictors of worse disease-free survival, of which three were amplified(MYC, ELAC2, and SYK) and three were deleted(GAK, MECOM, and WRN). Further, patients with HCC who exhibited ≥ 3 CNAs involving these six genes have worse outcomes compared to those who had < 3 CNAs(P < 0.001). Similarly, Asian patients with stage I HCC from The Cancer Genome Atlas harboring CNAs with these genes were also predicted to have poorer *** Patients with early-stage HCC and increased genome change or CNAs involving MYC, ELAC2, SYK, GAK, MECOM, or WRN are at risk for poorer outcome after resection.

关键词： Early-stage hepatocellular carcinoma copy number aberration Prognosis Onco Scan Molecular inversion probe

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A Panel of Genes Identified as Targets for 8q24.13-24.3 Gain Contributing to Unfavorable Overall Survival in Patients with Hepatocellular Carcinoma

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Current Medical Science 2018年第4期38卷 590-596页

作者： Kun ZHAO Yu ZHAO Jia-yi ZHU Hui DONG Wen-ming CONG Yi YU Hui WANG Zhong-Zheng ZHU Qing XU Department of Oncology Shanghai Tenth People's Hospital Tongji University School of Medicine Shanghai 200072 China Shanghai Clinical College of Anhui Medical University Shanghai 200072 China Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 China Department of Pathology Eastern Hepatobiliary Surgery Hospital Second Military Medical University Shanghai 200438 China

copy number aberrations （CNAs） in chromosome arm 8q have been associated with unfavorable clinical outcomes of several cancers and progressive tumor characteristics of hepatocellular carcinoma （HCC）. This study was to identify correlation of CNAs in 8q with clinical outcomes of HCC patients, and further screen for differentially expressed genes in outcome-related CNAs. Array comparative genomic hybridization and expression arrays were performed to detect CNAs and expression levels, respectively. The correlations between CNAs in 8q and outcomes were analyzed in 66 patients, with a median follow-up time of 45.0 months （range, 2.6-108.6 months）. One hundred and nine cases were further evaluated to identify differentially expressed genes in the potential outcome-related CNAs. copy number gain in 8q was observed in 22 （33.3%） of the 66 HCC cases. The most recurrent gains （with frequencies 〉20%） were 8q 13.3-21.3, 8q21.3-23.3, 8q23.3-24.13, 8q24.13-24.3, and 8q24.3. Survival analysis showed that 8q24.13-24.3 gain was significantly associated with reduced overall survival （P=0.010）. Multivariate Cox analysis identified 8q24.13- 24.3 gain as an independent prognostic factor for poor overall survival （HR=2.47; 95% CI=1.16-5.26; P=0.019）. A panel of 17 genes within the 8q24.13-24.3 region, including ATAD2, SQLE, PVT1, ASAP1, and NDRG1 were significantly upregulated in HCCs with 8q24.13-24.3 gain compared to those without. These results suggest that copy number gain at 8q24.13-24.3 is an unfavorable prognostic marker for HCC patients, and the potential oncogenes ATAD2, SQLE, PVT1, ASAP1, and NDRG1 within the regional gain, may contribute coordinately to the 8q24.13-24.3 gain-related poor prognosis.

关键词： chromosome 8 copy number aberration hepatocellular carcinoma prognosis gene expression

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