Abstract
The immune context of the tumor microenvironment (TME) is critical for effective immunotherapy. Nonetheless, DNA-based biomarkers for the immune-sensitive TME and the identification of immune checkpoint inhibitor (ICI) responders are under-explored. This study aims to comprehensively landscape the homologous recombination deficiency (HRD) score, an emerging hallmark for tumor genome instability that triggers immune responsiveness across major cancer types, and to unveil their link to the TME and immunotherapeutic response. The HRD-associated genomic scars were characterized in 9088 tumor samples across 32 cancer types from TCGA. We evaluated the HRD score’s performance in classifying ICI responders using an independent breast cancer cohort (GSE87049) and 11 in vivo murine mammary tumor models treated with anti-PD1/CTLA4 regimen (GSE124821). This study revealed a broad association between HRD-high genotype and neoantigenesis in the major cancer types including bladder cancer, breast cancer, head and neck squamous carcinoma, lung adenocarcinoma, lung squamous cell carcinoma, ovarian cancer, and sarcoma. Tumors with high HRD score bears increased leukocyte infiltration and lymphocyte fraction and demonstrated immune-sensitive microenvironment. The tumor immune dysfunction and exclusion (TIDE) model further confirmed HRD score-high genotype as a potential predictor for ICI immunotherapy responders in breast cancer. In conclusion, tumors with high HRD score exhibit an immune-sensitive TME. The HRD-high genotype is a promising marker for identifying ICI therapy responders among breast cancer patients.
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Data availability
All data generated or analyzed during this study are included in this published article (and its supplementary information files).
Abbreviations
- ICI:
-
Immune checkpoint inhibitors
- TME:
-
Tumor microenvironment
- TMB:
-
Tumor mutation burden
- MSI:
-
Microsatellite instability
- GEP:
-
Gene expression profile
- PARPi:
-
PARP protein inhibition
- HRD:
-
Homologous recombination deficiency
- TCGA:
-
The Cancer Genomic Atlas
- BRCA:
-
Breast invasive carcinoma
- CCLE:
-
Cancer Cell Line Encyclopedia
- LOH:
-
Loss of heterogeneity
- TAI:
-
Telomeric-allelic imbalance
- LST:
-
Large-scale state transitions
- DEG:
-
Differentially expressed gene
- tSNE:
-
T-distributed stochastic neighbor embedding
- TIDE:
-
Tumor immune dysfunction and exclusion
- MDSC:
-
Myeloid-derived suppressor cell
- CTL:
-
Cytotoxic T lymphocyte
- TAM-M2:
-
Tumor-associated macrophages-M2
- CAF:
-
Cancer-associated fibroblast
- OV:
-
Ovarian serous cystadenocarcinoma
- UCS:
-
Uterine carcinosarcoma
- LUAD:
-
Lung adenocarcinoma
- LUSC:
-
Lung squamous cell carcinoma
- ESCA:
-
Esophageal carcinoma
- SARC:
-
Sarcoma
- BLCA:
-
Bladder urothelial carcinoma
- STAD:
-
Stomach adenocarcinoma
- HNSC:
-
Head and neck squamous carcinoma
- PAAD:
-
Pancreatic ductal adenocarcinoma
- PRAD:
-
Prostate adenocarcinoma (PRAD)
- COAD:
-
Colon adenocarcinoma
- UCEC:
-
Uterine corpus endometrial carcinoma
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Acknowledgements
We thank the contributions of The Cancer Genome Atlas (TCGA), Cancer Cell Line Encyclopedia (CCLE), and the National Center for Biotechnology Information Sequence Read Archive (NCBI-SRA) for providing free access to online data. We thank Dr. Anthony Brickner at the University of Pittsburgh for the language editing.
Funding
This study was supported by the National Natural Science Foundation of China [81802993, 82072367], Shanghai Municipal Key Clinical Specialty [shslczdzk03303] and the Innovation Group Project of Shanghai Municipal Health Commission [2019CXJQ03].
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CY, XMT, XJZ, YMC, TTH, HTZ, MG, ZXM, and ZYW contributed to the study concept and design. CY, ZZJ, ZYW, and XJZ: acquisition, analysis, and validation of data; YMC, TTH and HTZ: data curation; CY, ZYW, XMT, and XJZ: drafting the manuscript and revised; MG, XMZ and WZY: supervision, project administration; MG and ZYW: funding acquisition. All the authors read and approved the final manuscript.
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Yang, C., Zhang, Z., Tang, X. et al. Pan-cancer analysis reveals homologous recombination deficiency score as a predictive marker for immunotherapy responders. Human Cell 35, 199–213 (2022). https://doi.org/10.1007/s13577-021-00630-z
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DOI: https://doi.org/10.1007/s13577-021-00630-z