Abstract
Epithelial ovarian cancers (EOCs) are sensitive to chemotherapy but will ultimately relapse and develop drug resistance. The origin of EOC recurrence has been elusive due to intra-tumor heterogeneity. Here we performed single-cell RNA sequencing (scRNA-seq) in 13,369 cells from primary, untreated peritoneal metastasis, and relapse tumors. We used time-resolved analysis to chart the developmental sequence of cells from the metastatic tumors, then traced the earliest replanting cells back to the primary tumors. We discovered seven distinct subpopulations in primary tumors where the CYR61+ “stress” subpopulation was identified as the relapse-initiators. Furthermore, a subpopulation of RGS5+ cancer-associated fibroblasts (CAFs) was found to strongly support tumor metastasis. The combined CYR61/RGS5 expression scores significantly correlated with the relapse-free-survival of EOC patients and can be used as predictors of EOC recurrence. Our study provides insights into the mechanism of EOC recurrence and presents CYR61+ relapse-initiating cells as potential therapeutic targets to prevent EOC relapse.
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Data availability
Data generated for this study are available through the Gene Expression Omnibus (GEO,) accession number GSE130000.
Code availability
The version and parameters for the R packages used in this study are available in Methods and Supplementary Methods.
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Acknowledgements
We thank Dr Junhai Wang from Taian Tumor Prevention and Treatment Hospital for assistance with IHC. This work was supported by grants from the General Research Fund (CityU_11319516) and the Research Impact Fund (R1020-18F) of Hong Kong Research Grant Council, the Guangdong Frontier and Key Technology Development Fund (2017B020226001) of Guangdong Province, PR China, and the Knowledge Innovation Program (JCYJ20170818095453642 and JCYJ20180307123759162) of Shenzhen Municipality, PR China.
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TK conceived the project, coordinated the collaboration, designed and performed the experiments, processed and analyzed the data, generated figures, and drafted and revised the paper. SZ provided the FFPE samples and supervisory support for histological study. SZ provided the fresh tumor samples for scRNA-seq. YZ and YZ checked the FFPE sample pathology and helped with the IHC experiments. YG checked the FFPE sample pathology and helped with the IHC imaging. TZ, FG, and XW provided computational support. LZ helped with collecting fresh tumor samples. MY supervised the project, revised the paper, and provided funding support to the project.
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Kan, T., Zhang, S., Zhou, S. et al. Single-cell RNA-seq recognized the initiator of epithelial ovarian cancer recurrence. Oncogene 41, 895–906 (2022). https://doi.org/10.1038/s41388-021-02139-z
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DOI: https://doi.org/10.1038/s41388-021-02139-z
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