Comprehensive Analysis of the Tumor Microenvironment and Ferroptosis-Related Genes Predict Prognosis with Ovarian Cancer.

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In this study, we focused on the interaction of immune infiltration and ferroptosis and selected the ESTIMATE algorithm and 15 ferroptosis-related genes (FRGs) to construct a novel E-FRG scoring model for predicting overall survival of OC patients. The gene expression and corresponding clinical characteristics were obtained from the TCGA dataset (n = 375), GSE18520 (n = 53), and GSE32062 (n = 260). A total of 15 FRGs derived from FerrDb with the immune score and stromal score were identified in the prognostic model by using least absolute shrinkage and selection operator (LASSO)-penalized COX regression analysis. The Kaplan-Meier survival analysis and time-dependent ROC curves performed a powerful prognostic ability of the E-FRG model via multi-validation. Gene Set Enrichment Analysis and Gene Set Variation Analysis elucidate multiple potential pathways between the high and low E-FRG score group. Finally, the proteins of different genes in the model were verified in drug-resistant and non-drug-resistant tumor tissues. The results of this research provide new prospects in the role of immune infiltration and ferroptosis as a helpful tool to predict the outcome of OC patients.", "claims": [{"id": "claim-method", "statement": "A total of 15 FRGs derived from FerrDb with the immune score and stromal score were identified in the prognostic model by using least absolute shrinkage and selection operator (LASSO)–penalized COX regression analysis.", "kind": "methodological", "target": null, "evidence": [{"asset": "source:pmid:34868262", "locator": "sections[0] \"Abstract\" paragraph 1", "quote": "A total of 15 FRGs derived from FerrDb with the immune score and stromal score were identified in the prognostic model by using least absolute shrinkage and selection operator (LASSO)–penalized COX regression analysis."}], "state": "complete"}, {"id": "claim-data-access", "statement": "The data that support the findings of this study are openly available in the Cancer Genome Atlas (TCGA) database for TCGA-OV at https://www.cancer.gov/t-cga, the Gene Expression Omnibus (GEO) database for GSE32062 at https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE32062, for GSE73293 at https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE73293.", "kind": "methodological", "target": null, "evidence": [{"asset": "source:pmid:34868262", "locator": "sections[24] \"Data Availability Statement\" paragraph 2", "quote": "The data that support the findings of this study are openly available in the Cancer Genome Atlas (TCGA) database for TCGA-OV at https://www.cancer.gov/t-cga, the Gene Expression Omnibus (GEO) database for GSE32062 at https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE32062, for GSE73293 at https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE73293."}], "state": "complete"}, {"id": "claim-target-result", "statement": "A total of 15 FRGs derived from FerrDb with the immune score and stromal score were identified in the prognostic model by using least absolute shrinkage and selection operator (LASSO)–penalized COX regression analysis.", "kind": "qualitative", "target": null, "evidence": [{"asset": "source:pmid:34868262", "locator": "sections[0] \"Abstract\" paragraph 1", "quote": "A total of 15 FRGs derived from FerrDb with the immune score and stromal score were identified in the prognostic model by using least absolute shrinkage and selection operator (LASSO)–penalized COX regression analysis."}], "state": "complete"}], "gaps": []}, "experiment": {"state": "complete", "objective": "A total of 15 FRGs derived from FerrDb with the immune score and stromal score were identified in the prognostic model by using least absolute shrinkage and selection operator (LASSO)–penalized COX regression analysis.", "steps": [{"id": "read_published_estimate", "order": 1, "name": "Read the published estimate from the source", "kind": "other", "state": "complete", "blocked_on": null, "description": "The claim, method and evidence span published with the source article.", "duration_hours": null, "parameters": {}, "inputs": ["source:pmid:34868262"], "outputs": ["the published estimate and its evidence"], "instruments": [], "reagents": []}, {"id": "obtain_source_data", "order": 2, "name": "Obtain the source data from the named repository", "kind": "data-preparation", "state": "complete", "blocked_on": null, "description": "The GEO series accession resolves and its sample accessions are listed. 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