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Journal of Gastrointestinal & Digestive System | ISSN: 2161-069X | Volume: 8
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October 29-30, 2018 | San Francisco, USA
International Conference on
Gastrointestinal Cancer and Therapeutics
4th World Congress on
Digestive & Metabolic Diseases
26th Annual Congress on
Cancer Science and Targeted Therapies
Z-score-based approach for differential diagnosis of malignant and benign liver neoplasms using
transcriptional biomarkers
Mikhail S Chesnokov
N N Blokhin National Medical Research Center of Oncology, Russian Federation
Hepatocellular carcinoma (HCC) is the most common and aggressive type of liver tumors. It is usually diagnosed at
advanced stages due to lack of clear symptoms and reliable biomarkers. HCC diagnosis is further complicated by high
similarity between early HCC stages and benign liver neoplasms, especially hepatocellular adenoma. Efficient methods of HCC
identification are required for establishing precise diagnosis and choosing optimal treatment strategy. Our group previously
identified five genes (IQGAP3, RAB3B, GPC3, PRRX1 and CENPF) specifically overexpressed in HCC, but not in benign
neoplasms or normal liver tissue. Present study evaluates the diagnostic efficiency of combinational indexes generated using
expression levels of these genes and z-score approach. We examined paired samples of neoplastic and normal liver tissue
collected from 50 HCC patients and 15 patients with hepatocellular adenoma or focal nodular hyperplasia. Gene expression
levels were estimated using RT-qPCR, z-scores were calculated for single genes and all possible gene combinations. Z-score-
based indexes were statistically processed using cohort comparison tests and ROC analysis to evaluate their usefulness
for discerning HCC samples from normal liver tissue and benign neoplasms. IQGAP3, GPC3, PRRX1 and CENPF were
significantly (p<0.05) overexpressed in HCC samples, but not in benign neoplasms, when compared to non-tumor liver tissue.
RAB3B expression was increased in benign cohort and further elevated in HCC cohort. The most efficient combinations for
HCC tissue identification were RAB3B+IQGAP3+PRRX1 (if both neoplastic and non-tumor tissue samples were used, ROC
AUC=0.973) and RAB3B+PRRX1+CENPF (if only neoplastic samples were processed, ROC AUC=0.961). Both combinations
displayed sensitivity and specificity levels higher than 90%. In summary, RAB3B, IQGAP3, PRRX1 and CENPF are promising
biomarkers for improving HCC diagnosis efficacy. Z-score calculation is a powerful tool for combining expression levels of
multiple genes into one index that can be used as an efficient biomarker. Present study was funded by RFBR according to the
research project № 18-315-00376.
Biography
Mikhail S Chesnokov has completed his PhD from N.N. Blokhin National Medical Research Center of Oncology, Moscow, Russian Federation. He worked as a
research associate in Lab of Epithelial Tumor Progression Mechanisms, Institute of Carcinogenesis, studying molecular mechanisms of pancreatic and liver cancer
progression. Over last several years he published a number of research papers and participated in numerous international conferences reporting novel regulators
of pancreatic ductal adenocarcinoma development and putative biomarkers of hepatocellular carcinoma. He recently moved to The Hormel Institute, University of
Minnesota, USA, to apply his experience and skills in the field of targeted anti-cancer therapy focused on eradication of stem-like cancer cells in ovarian tumors via
necroptotic cell death induction. Mikhail’s major areas of interest in regard to cancer research are regulatory mechanisms of malignant cell differentiation, diagnostic
biomarkers for early cancer diagnosis and search for novel molecular targets that can be used for efficient anti-tumor therapy.
Mikhail S Chesnokov, J Gastrointest Dig Syst 2018, Volume 8
DOI: 10.4172/2161-069X-C8-086