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Machine intelligence-driven classification of cancer patients-derived extracellular vesicles using fluorescence correlation spectroscopy: results from a pilot study

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Abstract

Patient-derived extracellular vesicles (EVs) that contains a complex biological cargo is a valuable source of liquid-biopsy diagnostics to aid in early detection, cancer screening, and precision nanotherapeutics. In this study, we predicted that coupling cancer patient blood-derived EVs to time-resolved spectroscopy and artificial intelligence (AI) could provide a robust cancer screening and follow-up tools. In our pilot study, fluorescence correlation spectroscopy (FCS) measurements were taken on 24 blood samples-derived EVs. Blood samples were obtained from 15 cancer patients (presenting five different types of cancers), and nine healthy controls (including patients with benign lesions). EVs samples were labeled with PKH67 dye. The obtained FCS autocorrelation spectra were processed into power spectra using the fast Fourier transform algorithm. The processed power spectra were subjected to various machine learning algorithms to distinguish cancer spectra from healthy control spectra. The performance of AdaBoost Random Forest (RF) classifier, support vector machine, and multilayer perceptron were tested on selected frequencies in the N = 118 power spectra. The RF classifier exhibited the highest classification accuracy and performance metrics in distinguishing the FCS power spectra of cancer patients from those of healthy controls. Further, neural computing via an image convolutional neural network (CNN), ResNet network, and a quantum CNN were assessed on the power spectral images as additional validation tools. All image-based CNNs exhibited a nearly equal classification performance and reasonably high sensitivity and specificity scores. Our pilot study demonstrates that AI-algorithms coupled to time-resolved FCS power spectra can accurately and differentially classify the complex patient-derived EVs from different cancer samples of distinct tissue subtypes. As such, our findings hold promise in the diagnostic and prognostic screening in clinical medicine.

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Data and code availability

All codes and sample datasets obtained in this experiment are made available in the GitHub link below. GitHub link: https://github.com/Abicumaran/FCS_EVClassification. Multifractal analysis: WTMM toolbox guidelines in MATLAB to extract Hurst scaling exponent: https://www.mathworks.com/help/wavelet/ug/multifractal-analysis.html. https://onlineconfusionmatrix.com/ (to calculate the sensitivity and specificity from the confusion matrices).

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Acknowledgements

We are grateful to Ayat Salman for her assistance with the Ethical Committee approvals. Fluorescence correlation spectroscopy measurements were taken by Joel Ryan at the McGill Advanced BioImaging Facility (ABIF, RRID: SCR_017697).

Funding

This work was financially supported by Giuseppe Monticciolo and the Morris and Bella Fainman Family Foundation. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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Correspondence to Abicumaran Uthamacumaran or Goffredo Arena.

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The authors declare no conflict of interest.

Ethical approval

Patients were recruited in accordance with an approved ethics protocols by the Ethics Committee of the McGill University Health Centre (MP-37-2018-3916 and SDR-10-057). Patients signed consents were obtained before enrollment in the study.

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An earlier version of the article is available at the Arxiv Preprint server in the following link: https://arxiv.org/abs/2202.00495.

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Appendix

Appendix

figure a

Quantum ml circuit The circuit from the training samples in the first iteration of the 2-layer circuit, reproduced from Sengupta and Srivastava [29]. For further details of the QNN, refer to the citation.

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Uthamacumaran, A., Abdouh, M., Sengupta, K. et al. Machine intelligence-driven classification of cancer patients-derived extracellular vesicles using fluorescence correlation spectroscopy: results from a pilot study. Neural Comput & Applic 35, 8407–8422 (2023). https://doi.org/10.1007/s00521-022-08113-4

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  • DOI: https://doi.org/10.1007/s00521-022-08113-4

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