Recent efforts to design personalized cancer immunotherapies use predicted neoantigens, but most neoantigen prediction strategies do not consider proximal (nearby) variants that alter the peptide sequence and may influence neoantigen binding. We evaluated somatic variants from 430 tumors to understand how proximal somatic and germline alterations change the neoantigenic peptide sequence and also affect neoantigen binding predictions. On average, 241 missense somatic variants were analyzed per sample. Of these somatic variants, 5% had one or more in-phase missense proximal variants. Without incorporating proximal variant correction for major histocompatibility complex class I neoantigen peptides, the overall false discovery rate (incorrect neoantigens predicted) and the false negative rate (strong-binding neoantigens missed) across peptides of lengths 8–11 were estimated as 0.069 (6.9%) and 0.026 (2.6%), respectively.
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Several of the in-house sequencing datasets used in the study have been previously published and deposited in various databases. All sequence data for the HER2+ breast cancer samples can be accessed via the Database of Genotypes and Phenotypes (dbGaP; study accession phs001291)17. Data for the oral squamous cell carcinoma project and hepatocellular carcinoma samples are part of other manuscripts currently in preparation and can be accessed under dbGaP study accessions phs001623 and phs001106, respectively. Results for the glioblastoma case18 and small cell lung cancer cases19 have been published and can be accessed under dbGaP study accessions phs001663 and phs001049, respectively. TCGA data can be accessed under dbGaP study accession phs000178.
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We are grateful to the research participants and their families, without whom this study would not be possible. We thank G. Dunn for early access to raw data for the published glioblastoma hypermutator case included in our analysis. We also thank R. Schreiber and B. Carreno for the initial discussions that inspired the study, and for their expertise and guidance during the study. R.G. was supported by the National Institutes of Health (NIH) National Cancer Institute (U01CA231844). S.J.S. was supported by the NIH National Library of Medicine (R01LM012222 and R01LM012482). O.L.G. was supported by the NIH National Cancer Institute (U01CA209936 and U01CA231844). M.G. was supported by the NIH National Human Genome Research Institute (R00HG007940) and the NIH National Cancer Institute (U01CA209936).
The authors declare no competing interests.
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Integrated supplementary information
This figure shows the possible sub-peptide registers for selection of a candidate neoantigen of length 9. The 17-mer peptide window for a 9-mer candidate is selected by scanning 8 amino acids on each side of the mutated amino acid resulting from the SVOI (red box). Only those registers that contain amino acid changes resulting from both—the proximal variant (PV; orange box), as well as the SVOI (red box)—were considered for this analysis (five peptides shown in yellow for this example). The remaining registers shown (gray boxes) contain the SVOI but are not affected by the proximal variant.
An example from one of the TCGA melanoma samples with a missense SNV that overlaps a germline SNP (dbSNP ID: rs9891498), 21 nucleotides upstream. When translated, the germline SNP results in the S357F (NP_001275708.1:p.Phe357Ser) alteration and is 7 amino acids downstream of the missense somatic variant F350S (NP_001275708.1:p.Ser350Phe) in MARCH10.
Supplementary Figures 1 and 2
This table shows, for each sample, the percentage of SVOIs harboring any neighboring variants within the specified 89-bp window and the percentage of the total SVOIs that had any proximal variants in phase
This table shows the breakdown of all sequencing datasets used for this study and their corresponding accession IDs
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Hundal, J., Kiwala, S., Feng, YY. et al. Accounting for proximal variants improves neoantigen prediction. Nat Genet 51, 175–179 (2019). https://doi.org/10.1038/s41588-018-0283-9
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