Classification of cancers based on copy number variation landscapes.
Genomic alterations in DNA can cause human cancer. DNA copy number variants (CNV), as one of the types of DNA mutations, have been considered to be associated with various human cancers. CNVs vary in size from 1bp up to one complete chromosome arm. In order to understand the difference between different human cancers on CNVs, in this study, we developed a method to computationally classify six human cancer types by using only CNV level values. The CNVs of 23,082 genes were used as features to construct the classifier. Then the features are carefully selected by mRMR (minimum Redundancy Maximum Relevance Feature Selection) and IFS (Incremental Feature Selection) methods. An accuracy of over 0.75 was reached by using only the CNVs of 19 genes based on Dagging method in 10-fold cross validation. It was indicated that these 19 genes may play important roles in differentiating cancer types. We also analyzed the biological functions of several top genes within the 19 gene list. The statistical results and biological analysis of these genes from this work might further help understand different human cancer types and provide guidance for related validation experiments. This article is part of a Special Issue entitled "System Genetics" Guest Editor: Dr. Yudong Cai and Dr. Tao Huang.
Department of Biomedical Engineering, Tianjin Key Lab of Biomedical Engineering Measurement, Tianjin University, Tianjin, PR China. Electronic address: zhni@tju.edu.cn.
Ning
N
Zhang
Institute of Health Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, PR China. Electronic address: mengwang@sibs.ac.cn.
Meng
M
Wang
Institute of Health Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, PR China. Electronic address: zhangpeiwei@sibs.ac.cn.
Peiwei
P
Zhang
Institute of Health Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, PR China. Electronic address: tohuangtao@126.com.
Tao
T
Huang
D002875:Chromosomes / Q000235:genetics; D056915:DNA Copy Number Variations / Q000235:genetics*; D023281:Genomics / Q000379:methods; D006801:Humans; D009154:Mutation / Q000235:genetics; D009369:Neoplasms / Q000235:genetics*
Cancer type; DNA copy number variants; Feature selection; IFS; Sequential minimal optimization