De Novo Identification and Visualization of Important Cell Populations for Classic Hodgkin Lymphoma Using Flow Cytometry and Machine Learning.

TitleDe Novo Identification and Visualization of Important Cell Populations for Classic Hodgkin Lymphoma Using Flow Cytometry and Machine Learning.
Publication TypeJournal Article
Year of Publication2021
AuthorsSimonson PD, Wu Y, Wu D, Fromm JR, Lee AY
JournalAm J Clin Pathol
Date Published2021 Jun 27
ISSN1943-7722
Abstract

OBJECTIVES: Automated classification of flow cytometry data has the potential to reduce errors and accelerate flow cytometry interpretation. We desired a machine learning approach that is accurate, is intuitively easy to understand, and highlights the cells that are most important in the algorithm's prediction for a given case.

METHODS: We developed an ensemble of convolutional neural networks for classification and visualization of impactful cell populations in detecting classic Hodgkin lymphoma using two-dimensional (2D) histograms. Data from 977 and 245 clinical flow cytometry cases were used for training and testing, respectively. Seventy-eight nongated 2D histograms were created per flow cytometry file. Shapley additive explanation (SHAP) values were calculated to determine the most impactful 2D histograms and regions within histograms. SHAP values from all 78 histograms were then projected back to the original cell data for gating and visualization using standard flow cytometry software.

RESULTS: The algorithm achieved 67.7% recall (sensitivity), 82.4% precision, and 0.92 area under the receiver operating characteristic. Visualization of the important cell populations for individual predictions demonstrated correlations with known biology.

CONCLUSIONS: The method presented enables model explainability while highlighting important cell populations in individual flow cytometry specimens, with potential applications in both diagnosis and discovery of previously overlooked key cell populations.

DOI10.1093/ajcp/aqab076
Alternate JournalAm J Clin Pathol
PubMed ID34175918
Grant ListK23EY029246 / EY / NEI NIH HHS / United States
/ / Research to Prevent Blindness /
/ / University of Washington Department of Laboratory Medicine and Pathology /
/ / Roger Moe Fellowship /
/ / NVIDIA Corporation /
Related Faculty: 
Paul Simonson, M.D., Ph.D.

Pathology & Laboratory Medicine 1300 York Avenue New York, NY 10065 Phone: (212) 746-6464
Surgical Pathology: (212) 746-2700