Comparison of Dimensionality Reduction Methods in Mass Spectra of Astrocytoma and Glioblastoma Tissues.



Zhvansky, Evgeny, Sorokin, Anatoly, Shurkhay, Vsevolod, Zavorotnyuk, Denis, Bormotov, Denis, Pekov, Stanislav ORCID: 0000-0002-9622-3457, Potapov, Alexander, Nikolaev, Evgeny and Popov, Igor
(2021) Comparison of Dimensionality Reduction Methods in Mass Spectra of Astrocytoma and Glioblastoma Tissues. Mass spectrometry (Tokyo, Japan), 10 (1). A0094 - ?.

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Abstract

Recently developed methods of ambient ionization allow the collection of mass spectrometric datasets for biological and medical applications at an unprecedented pace. One of the areas that could employ such analysis is neurosurgery. The fast <i>in situ</i> identification of dissected tissues could assist the neurosurgery procedure. In this paper tumor tissues of astrocytoma and glioblastoma are compared. The vast majority of the data representation methods are hard to use, as the number of features is high and the amount of samples is limited. Furthermore, the ratio of features and samples number restricts the use of many machine learning methods. The number of features could be reduced through feature selection algorithms or dimensionality reduction methods. Different algorithms of dimensionality reduction are considered along with the traditional noise thresholding for the mass spectra. From our analysis, the Isomap algorithm appears to be the most effective dimensionality reduction algorithm for negative mode, whereas the positive mode could be processed with a simple noise reduction by a threshold. Also, negative and positive mode correspond to different sample properties: negative mode is responsible for the inner variability and the details of the sample, whereas positive mode describes measurement in general.

Item Type: Article
Divisions: Faculty of Health and Life Sciences
Faculty of Health and Life Sciences > Institute of Systems, Molecular and Integrative Biology
Depositing User: Symplectic Admin
Date Deposited: 06 May 2022 09:58
Last Modified: 21 Jul 2022 10:33
DOI: 10.5702/massspectrometry.a0094
Open Access URL: https://doi.org/10.5702/massspectrometry.A0094
URI: https://livrepository.liverpool.ac.uk/id/eprint/3154370