Application of multiple support vector machine recursive feature elimination model in cancer feature gene selection / 国际生物医学工程杂志

Objective To analyze the cancergene expression profile data using multi-support vector machine recursive feature elimination algorithm (MSVM-RFE) and calculate the genetic ranking score to obtain the optimal feature gene subset. Methods Gene expression profiles of bladder cancer, breast cancer, colon cancer and lung cancer were downloaded from GEO (Gene Expression Omnibus) database.The differentially expressed genes were obtained by differential expression analysis. The differential gene expressions were sequenced by MSVM-RFE algorithm and the average test errors of each gene subset were calculated. Then the optimal gene subsetsof four kinds of cancer were obtained according to the minimum average test errors. Based on the datasets of four kinds of cancer characteristic genes before and after screening, linear SVM classifiers were constructed and the classification efficiencies of the optimal feature gene subsets were verified. Results Using the optimal feature gene subsetobtained by MSVM-RFE algorithm, the classification accuracy was improved from (96.77±1.28)％to (99.85±0.46)％for the bladder cancer data, improved from (83.77±4.93)％to (88.30±3.85)％for the breast cancer data, and improved from (72.69±2.41)％to (90.21±3.31)％for the lung cancer data.Besides, theoptimal feature gene subsetkept the classification accuracy of colon cancer classifierat a high level (>99.5％). Conclusions The feature gene extraction based on MSVM-RFE algorithm can improve the classification efficiency of cancer.

Mining gene expression profi le in def icient cold syndrome with characteristics functional modules / 中华中医药杂志

Objective:To identify the deficient cold syndrome relevant genes and functional modules,based on gene expression profiles and gene functional knowledge to study the molecular mechanism of deficient cold syndrome.Methods:Screening the differential expression genes with Array Tools,and testing the classificational results to the samples.The Gene Ontology Tool was used for annotating characteristics functional gene,selecting functional modules enriched with differentially expressed genes;and then identifing the feature modules and analyzing their association with the deficient cold syndrome.Results:The accuracy rate of classification samples was 93% with 25 different gene,the accuracy rate was 87%-100% with 11 functional modules.Conclusion:These features function modules had some relevance to the occurrence of deficient cold syndrome.It was more favorable interpretation of the disease by studying functional modules based on gene expression profiles.