Abstract
Introduction
Metabolomics has emerged as a powerful method to provide insight into cancer progression, including separating patients into low- and high-risk groups for overall (OS) and progression-free survival (PFS). However, survival prediction based mainly on metabolites obtained from biofluids remains elusive.
Objectives
This proof-of-concept study evaluates metabolites as biomarkers obtained directly from tumor core biopsies along with covariates age, sex, pathological stage at diagnosis (I/II vs. III/VI), histological subtype, and treatment vs. no treatment to risk stratify lung cancer patients in terms of OS and PFS.
Methods
Tumor core biopsy samples obtained during routine lung cancer patient care at the University of Louisville Hospital and Norton Hospital were evaluated with high-resolution 2DLC-MS/MS, and the data were analyzed by Kaplan–Meier survival analysis and Cox proportional hazards regression. A linear equation was developed to stratify patients into low and high risk groups based on log-transformed intensities of key metabolites. Sparse partial least squares discriminant analysis (SPLS-DA) was performed to predict OS and PFS events.
Results
Univariable Cox proportional hazards regression model coefficients divided by the standard errors were used as weight coefficients multiplied by log-transformed metabolite intensity, then summed to generate a risk score for each patient. Risk scores based on 10 metabolites for OS and 5 metabolites for PFS were significant predictors of survival. Risk scores were validated with SPLS-DA classification model (AUROC 0.868 for OS and AUROC 0.755 for PFS, when combined with covariates).
Conclusion
Metabolomic analysis of lung tumor core biopsies has the potential to differentiate patients into low- and high-risk groups based on OS and PFS events and probability.
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Data availability
Datasets used are in [Metabolomics Workbench (MetWB), RRID:SCR_013794, www.metabolomicsworkbench.org] (Study ST001527).
Abbreviations
- HR:
-
Hazard ratio
- NSCLC:
-
Non-small cell lung cancer
- OS:
-
Overall survival
- PC1:
-
First principal component
- PC2:
-
Second principal component
- PC3:
-
Third principal component
- PFS:
-
Progression free survival
- PLS-DA:
-
Partial least squares discriminant analysis
- SPLS-DA:
-
Sparse partial least squares discriminant analysis
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Acknowledgements
Authors acknowledge Melissa Hall, Andrei Smolenkov, and Danyelle Clark for James Graham Brown Cancer Center Biorepository support; Andrea Spencer, Lauren Whelan, Dr. John Hamm, and Dr. Stephen Wyatt for collection of samples at Norton Hospital.
Funding
This work was supported by National Institutes of Health/National Cancer Institute Grant R15CA203605 (Frieboes).
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This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by Internal Review Board protocols at University of Louisville Hospital (IRB 05.0523) and Norton Hospital (IRB 18.0264).
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Miller, H.A., Rai, S.N., Yin, X. et al. Lung cancer metabolomic data from tumor core biopsies enables risk-score calculation for progression-free and overall survival. Metabolomics 18, 31 (2022). https://doi.org/10.1007/s11306-022-01891-x
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DOI: https://doi.org/10.1007/s11306-022-01891-x