Turkiye Klinikleri Journal of Biostatistics

.: ORIGINAL RESEARCH
Data Mining Genome-Based Algorithm for Optimal Gene Selection and Prediction of Colorectal Carcinoma
Optimal Gen Seçimi İçin Veri Madenciliği Genom Tabanlı Algoritma ve Kolorektal Karsinomun Tahmini
Alabi Waheed BANJOKOa
aDepartment of Statistics, University of Ilorin, Ilorin, Kwara State, NIGERIA
Turkiye Klinikleri J Biostat. 2020;12(3):261-71
doi: 10.5336/biostatic.2020-77341
Article Language: EN
Full Text
ABSTRACT
 Objective: This study presents a method for optimal selection of gene subsets to enhance the non-clinical diagnostic classification and prediction of colorectal cancer using gene expression level of gene expression profiles obtained with an Affymetrix oligonucleotide array. Material and Method: A Hybrid multi-objective Support vector Machine (SVM) feature selection and classification algorithm was employed to determine the Biomarker gene subsets that are highly statistically and clinically relevant to the 62 (tumour or normal) responses of the gene expression levels. The genes selection was done in two stages with the first stage using the Bayesian t-test to prune the non-informative genes and the second stage employed the multi-objective optimization method that allows sequential addition of genes for optimal determination of the pre-selected gene subsets. The SVM with RBF kernel (〖SVM〗_RBF ) was fitted sequentially to select the set of near-optimal genes that are correlated with the response class. Results: The optimally selected gene subset yielded an accuracy of 90.1% on the test data that were never used in the building process of the algorithm.Furthermore, the results obtained from the principal component analysis and the complete linkage hierarchical clustering indicated near-perfect discrimination of the two clinical response groups of the colorectal cancer status of the patients. Conclusion: This work has fully demonstrated that non-clinical colon cancer diagnosis and prediction of patients using their gene signatures from the gene microarray expression data is very possible when the appropriate data mining technique tools are used.

Keywords: Support vector machines; feature selection; multi-objective optimization; principal component analysis; clustering
ÖZET
 Amaç: Bu çalışma, afimetrik oligo-nükleotid dizisi ile elde edilen gen ekspresyon profillerinin gen ekspresyon seviyesini kullanarak kolorektal kanserin klinik olmayan tanı sınıflandırmasını ve tahminini geliştirmek amacıyla gen alt kümelerinin optimal seçimi için bir yöntem sunar. Gereç ve Yöntemler: Gen ekspresyon seviyelerinin 62 (tümör veya normal) yanıtları ile istatistiksel ve klinik olarak oldukça ilgili biyo-belirteç alt kümelerini belirlemek için hibrit çok amaçlı destek vektör makinesi (DVM) özelliği seçimi ve sınıflandırma algoritması kullanılmıştır. Gen seçimi iki aşamada yapılmıştır; ilk aşamada bilgi vermeyen genleri budamak için Bayesçi t-testi, ikinci aşamada önceden seçilen gen alt kümelerinin optimal belirlenmesi için genlerin için sekansiyel eklenmesine izin veren çok amaçlı optimizasyon yöntemi kullanılmıştır. RBF çekirdeğine sahip SVM (SVMREF), yanıt sınıfı ile korele olan neredeyse optimal genler kümesini seçmek için sırayla yerleştirildi. Bulgular: Optimal olarak seçilen gen alt kümesi, algoritmanın oluşturulma sürecinde hiç kullanılmayan test verilerinde %90.1'lik bir doğruluk sağlamıştır. Ayrıca, ana bileşen analizinden ve tam bağlantı hiyerarşik kümelenmesinden elde edilen sonuçlar, kolorektal kanser durumunun iki klinik yanıt grubunun ayırt edilmesi için neredeyse mükemmele yakın ayrımını göstermiştir. Sonuç: Bu çalışma, klinik olmayan kolon kanseri teşhisinin ve hastaların gen mikro-dizi ekspresyon verilerinden kendi gen imzalarını kullanarak tahmin etmelerinin, uygun veri madenciliği teknik araçları kullanıldığında çok mümkün olduğunu tam olarak göstermiştir.

Anahtar Kelimeler: Destek vektör makineleri; öznitelik seçimi; çok amaçlı optimizasyon; temel bileşenler analizi; kümeleme
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