| چکیده انگلیسی مقاله |
Breathomics is the metabolomics study of exhaled air. It is a powerful emerging metabolomics research field that mainly focuses onhealth-related volatile organic compounds (VOCs). Since the quantity of these compounds varies with health status, breathomics assuresto deliver noninvasive diagnostic tools. Thus, the main aim of breathomics is to discover patterns of VOCs related to abnormal metabolicprocesses occurring in the human body. Classification systems, however, are not designed for cost-sensitive classification domains.Therefore, they do not work on the gastric carcinoma (GC) domain where the benefit of correct classification of early stages is more thanthat of later stages, and also the cost of wrong classification is different for all pairs of predicted and actual classes. The aim of this work to demonstrate the basic principles for the breathomics to classify the GC, for that the determination of VOCs such as acetone, carbondisulfide, 2-propanol, ethyl alcohol, and ethyl acetate in exhaled air and stomach tissue emission for the detection of GC has been analyzed.The breath of 49 GC and 30 gastric ulcer patients were collected for the study to distinguish the normal, suspected, and positive cases usingback-propagation neural network (BPN) and produced the accuracy of 93%, sensitivity of 94.38%, and specificity of 89.93%. This studycarries out the comparative study of the result obtained by the single- and multi-layer cascade-forward and feed-forward BPN with differentactivation functions. From this study, the multilayer cascade-forward outperforms the classification of GC from normal and benign cases. |