Cited by 71Cancer Immunotherapy and BiomarkersLung Cancer Treatments and MutationsCancer Genomics and Diagnostics

KRAS G12D mutation predicts lower TMB and drives immune suppression in lung adenocarcinoma

Gao, Ge, Liao, Weiting, Ma, Qizhi, Zhang, Benxia, Chen, Yue, Wang, Yongsheng·2020·Lung Cancer

Abstract

Objectives The efficacy of anti- programmed cell death 1 (PD-1)/PD-1 ligand (PD-L1) immune checkpoint inhibitors remains controversial in patients with KRAS mutation. In addition, whether and how KRAS gene and its mutant subtypes might influence immunity has not been clarified yet. Here we examine some important biomarkers for the efficacy of immunotherapy in specific KRAS subtypes.Materials and methods We conducted a bioinformatics analysis on somatic mutations data, transcriptome sequencing data and proteomic data from The Cancer Genome Atlas (TCGA) database. CIBERSORT was used to provide an estimation of the abundances of immune cells using gene expression data.Results From a cohort of 567 patients with lung adenocarcinoma (LUAD) based on TCGA, the overall mutation rate of KRAS was 26.29 %, including KRAS/TP53 co-mutation rate of 9.7 %. We observed increased Tumor mutation burden (TMB) in KRAS mutant group compared with wild type, while no difference in PD-L1 expression and immune cell infiltration. More importantly, TP53 and KRAS/TP53 co-mutation group not only significantly increased tumor mutation burden, but also had higher PD-L1 protein level and immune cell infiltration. We further focused on influence of KRAS mutant subtype on immune biomarker. The most prevalent mutant subtype of KRAS in lung adenocarcinoma was G12C(9.88 %,56/567), followed by G12 V(5.82 %,33/567), G12D(3.00 %,17/567), G12A(3.00 %,17/567), respectively. Among them, G12D mutation appeared to be a special mutant subtype with an obviously lower TMB. This low mutation load was more significant when co-mutation with TP53. Besides, our results also revealed significantly decreased expressions of PD-L1 protein level and immune cell infiltration (activated CD4 memory T cell, helper T cell, M1 macrophage and NK cell) in KRAS G12D/TP53 mutant group.Conclusion KRAS G12D/TP53 co-mutation drives immune suppression and might be a negative predictive biomarker for anti-PD-1/PD-L1 immune checkpoint inhibitors in patients with lung adenocarcinoma.

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Crossref · 10.1016/j.lungcan.2020.09.004

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  • Early data suggest KRAS alleles other than G12C, especially with TP53 co-mutation, may be negative predictive biomarkers for anti-PD-1/PD-L1 inhibitors in NSCLC.

    “Early data suggests that the presence of KRAS alleles other than G12C mutations (75), especially in conjunction with a TP53 co-mutation, may represent a negative predictive biomarkers for anti-PD-1/PD-L1 immune checkpoint inhibitors in NSCLC patients (76).”

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Authors
Gao, G., Liao, W., Ma, Q., Zhang, B., Chen, Y., & Wang, Y.
Affiliations
  • West China Hospital of Sichuan University (CN)
  • Sichuan University (CN)
Corresponding author
Wang, Yongsheng
Venue
Lung Cancer
Publisher
Elsevier BV
Published
2020-11
Volume
149
Pages
41-45
ISSN
0169-5002 (ISSN-L)
OpenAlex
W3085963549
Cited by
71
References
14
Citations by year
2026: 5 · 2025: 13 · 2024: 10 · 2023: 16 · 2022: 18 · 2021: 8 · 2020: 1
FWCI
3.88
Type
journal article
Language
en
Open access
closed
Locations
  • Lung Cancer (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Major Science and Technology Projects of China
Topics
  • Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Lung Cancer Treatments and Mutations
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer Genomics and Diagnostics
Keywords
KRAS G12D mutation, lung adenocarcinoma, tumor mutational burden, TP53 co-mutation, PD-L1 expression, immune cell infiltration, immunosuppression, PD-1/PD-L1 blockade, predictive biomarkers, tumor immune microenvironment
MeSH terms
Adenocarcinoma of Lung, Carcinoma, Non-Small-Cell Lung, Humans, Lung Neoplasms, Mutation, Proto-Oncogene Proteins p21(ras), Proteomics, B7-H1 Antigen

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