Abstract
Neoantigens are the key targets of antitumor immune responses from cytotoxic T cells and play a critical role in affecting tumor progressions and immunotherapy treatment responses. However, little is known about how the interaction between neoantigens and T cells ultimately affects the evolution of cancerous masses. Here, we develop a hierarchical Bayesian model, named neoantigen–T cell interaction estimation (netie) to infer the history of neoantigen-CD8+ T cell interactions in tumors. Netie was systematically validated and applied to examine the molecular patterns of 3,219 tumors, compiled from a panel of 18 cancer types. We showed that tumors with an increase in immune selection pressure over time are associated with T cells that have an activation-related expression signature. We also identified a subset of exhausted cytotoxic T cells postimmunotherapy associated with tumor clones that newly arise after treatment. These analyses demonstrate how netie enables the interrogation of the relationship between individual neoantigen repertoires and the tumor molecular profiles. We found that a T cell inflammation gene expression profile (TIGEP) is more predictive of patient outcomes in the tumors with an increase in immune pressure over time, which reveals a curious synergy between T cells and neoantigen distributions. Overall, we provide a new tool that is capable of revealing the imprints left by neoantigens during each tumor’s developmental process and of predicting how tumors will progress under further pressure of the host’s immune system.
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Data availability
The baseline patients come from TCGA and the patients with kidney cancer from our previous study21. The TCGA data (expression, mutation and survival) were downloaded from the TCGA firehose website (https://gdac.broadinstitute.org/,version of 2016012800.0.0). TCGA HLA typing data were provided by Thorsson et al.55. For the treatment cohorts, we gathered 32 patients with gastric cancer from Cristescu et al.42 and Kim et al.45; eight patients with NSCLC from Anagnostou et al.46; 105 patients with HNSCC from Cristescu et al.42; 352 patients with melanoma from Cristescu et al.42, Hugo et al.5, Liu et al.47, Riaz et al.6 and Van Allen et al.48; and 157 patients with RCC from IMmotion150 cohort49 and Miao et al.7. Information on access to data is provided in these original reports. The in-house MDACC patients’ raw genomic data have been uploaded into the European Genome-Phenome Archive (EGA) with the accession numbers EGAD00001008382 and EGAD00001008482. The accession codes and links for each dataset are listed in Supplementary Table 4. Source data are provided with this paper.
Code availability
The netie R package is available at https://github.com/tianshilu/Netie with Apache license version v.2.0.
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Acknowledgements
We acknowledge A. Gouru and A. Passey for helping with proof-reading of the manuscript. This study was supported by the National Institutes of Health (NIH) (grant nos. CCSG 5P30CA142543, 1R01CA258584, 5P30CA142543 and U01AI156189 to T.W. and R01CA234629 to J.Z.), Cancer Prevention Research Institute of Texas (grant nos. CPRIT RP190208 to T.W., CPRIT RP160668 to J.Z., RP160668 to I.W.), University of Texas MDACC (Physician Scientist Program, J.Z. and Lung Cancer Moon Shot, A.R.), Cancer Foundation at the University of Texas MDACC (Institutional Research Grant, A.R.), the Waun Ki Hong Lung Cancer Research Fund (A.R.), Exon 20 Group (A.R.) and Rexanna’s Foundation for Fighting Lung Cancer (A.R.). The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript.
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T.L. performed all analyses. T.W. supervised the study. S.M.H., J.V.H., P.A.F., I.W., A.R. and J.Z. provided the in-house sequencing data. Y.H. and Y.W. provided critical input in the science and also the writing. T.L., S.P. and T.W. wrote the paper.
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Extended data
Extended Data Fig. 1 Applying netie on the simulation data.
Two more simulation datasets (a) and (b,c). (a) Simulation setting of the second dataset and netie’s inference results. (b) Simulation setting of the third dataset. (c) Netie’s inference results for the third dataset. The same simulation and analysis procedures, as in Fig. 1e–g, were carried out.
Extended Data Fig. 2 Immune selection pressure variations correlate with the genotypes of the tumor and tumor clones.
(a) The top genes with smallest Wilcoxon test P values comparing the immune pressure variations in the tumor clones with and without mutations in each gene. (b) Boxplots of the immune pressure variation (ac) in the tumor clones with and without mutations in SETDB1 and FN1. (c) Enriched GO terms of the genes with Wilcoxon test P value<0.05. For boxplot in (b), box boundaries represent interquantile ranges, whiskers extend to the most extreme data point which is no more than 1.5 times the interquartile range, and the line in the middle of the box represents the median.
Extended Data Fig. 3 The immune selection pressure scores of the shared and the private tumor clones of the other MDACC lung cancer patients with multi-region sampling.
The center of the error bar represents the inferred immune pressure variation (ac), and the error bars represent 95% confidence intervals.
Extended Data Fig. 4 Further validating the implication of Netie classifications for prognosis of patients (a,b) Multivariate analysis testing the association between TIGEP and overall survival in INisp and DEisp patients.
(a) INisp patients, (b) DEisp patients. The association between TIGEP and overall survival is tested in a CoxPH model, with multi-variate adjustment for pathological stage, gender, age, and tumor types.
Extended Data Fig. 5 Analyses as conducted in Fig. 4a, but with the clonality inference conducted by PhyloWGS and SciClone (a), or with the neoantigens predicted by MHCflurry (b).
The TCGA LUAD cohort was employed as an example.
Supplementary information
Supplementary Information
Note 1: Detailed description of the netie model. Note 2: Additional analyses and discussions involving the netie model.
Supplementary Software
A zipped version of the netie software for documentation purpose.
Supplementary Tables
Table 1: Wilcoxon test P values of the genes investigated in Extended Data Fig. 2. Table 2: The effect of the tuning parameters on the performance of the model. Table 3: Detailed characteristics, including age, gender and smoking status, of the in-house MDACC patients with lung cancer cohort. Table 4: Accession methods of the data used in our study.
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Lu, T., Park, S., Han, Y. et al. Netie: inferring the evolution of neoantigen–T cell interactions in tumors. Nat Methods 19, 1480–1489 (2022). https://doi.org/10.1038/s41592-022-01644-7
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DOI: https://doi.org/10.1038/s41592-022-01644-7
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