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Clin Cancer Res. 2018 Oct 15;24(20):5037-5047. doi: 10.1158/1078-0432.CCR-18-0784. Epub 2018 Jul 3.

Consensus on Molecular Subtypes of High-Grade Serous Ovarian Carcinoma.

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Princess Margaret Cancer Centre, Toronto, Ontario, Canada.
City University of New York School of Public Health, New York, New York.
Institute for Implementation Science in Population Health, City University of New York, New York, New York.
Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.
Department of Computer Science, University of Toronto, Toronto, Ontario, Canada.
Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute, and Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts.
University of Alabama Comprehensive Cancer Center, Birmingham, Alabama.
Princess Margaret Cancer Centre, Toronto, Ontario, Canada.
Ontario Institute of Cancer Research, Toronto, Ontario, Canada.
City University of New York School of Public Health, New York, New York.
Contributed equally


Purpose: The majority of ovarian carcinomas are of high-grade serous histology, which is associated with poor prognosis. Surgery and chemotherapy are the mainstay of treatment, and molecular characterization is necessary to lead the way to targeted therapeutic options. To this end, various computational methods for gene expression-based subtyping of high-grade serous ovarian carcinoma (HGSOC) have been proposed, but their overlap and robustness remain unknown.Experimental Design: We assess three major subtype classifiers by meta-analysis of publicly available expression data, and assess statistical criteria of subtype robustness and classifier concordance. We develop a consensus classifier that represents the subtype classifications of tumors based on the consensus of multiple methods, and outputs a confidence score. Using our compendium of expression data, we examine the possibility that a subset of tumors is unclassifiable based on currently proposed subtypes.Results: HGSOC subtyping classifiers exhibit moderate pairwise concordance across our data compendium (58.9%-70.9%; P < 10-5) and are associated with overall survival in a meta-analysis across datasets (P < 10-5). Current subtypes do not meet statistical criteria for robustness to reclustering across multiple datasets (prediction strength < 0.6). A new subtype classifier is trained on concordantly classified samples to yield a consensus classification of patient tumors that correlates with patient age, survival, tumor purity, and lymphocyte infiltration.Conclusions: A new consensus ovarian subtype classifier represents the consensus of methods and demonstrates the importance of classification approaches for cancer that do not require all tumors to be assigned to a distinct subtype. Clin Cancer Res; 24(20); 5037-47. ©2018 AACR.

[Available on 2019-10-15]

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