Abstract
Background
Immune checkpoint inhibitor (ICI) has an emerging role in several types of cancer. However, the mechanisms of acquired resistance (AR) to ICI have not been elucidated yet. To identify these mechanisms, we analyzed the pre- and post-ICI paired tumor samples in patients with AR.
Methods
Six patients with renal cell carcinoma, urothelial cell carcinoma, or head and neck cancer, who showed an initial response to ICI followed by progression and had available paired tissue samples, were retrospectively analyzed. Whole exome sequencing, RNA sequencing, and multiplex immunohistochemistry were performed on pre-treatment and resistant tumor samples.
Results
The median time to AR was 370 days (range, 210 to 739). Increased expression of alternative immune checkpoints including TIM3, LAG3, and PD-1 as well as increased CD8+ tumor-infiltrating lymphocytes were observed in post-treatment tumor than in pre-treatment tumor of a renal cell carcinoma patient. In contrast, CD8+ T cells and immunosuppressive markers were all decreased at AR in another patient with human papillomavirus-positive head and neck squamous cell carcinoma. This patient had an evident APOBEC-associated signature, and the tumor mutation burden increased at AR. Resistant tumor tissue of this patient harbored a missense mutation (E542K) in PIK3CA. No significant aberrations of antigen-presenting machinery or IFN-γ pathway were detected in any patient.
Conclusions
Our study findings suggest that the observed increase in immunosuppressive markers after ICI might contribute to AR. Moreover, APOBEC-mediated PIK3CA mutagenesis might be an AR mechanism. To validate these mechanisms of AR, further studies with enough sample size are required.
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Availability of data and materials
The dataset used and/or analyzed during the current study is provided in the supplemental materials and additional materials are available from the corresponding author on reasonable request.
Abbreviations
- ICI:
-
Immune checkpoint inhibitor
- AR:
-
Acquired resistance
- PD-L1:
-
Programmed death-ligand 1
- TMB:
-
Tumor mutational burden
- PD-1:
-
Programmed cell death protein 1
- FFPE:
-
Formalin-fixed and paraffin-embedded
- LAG3:
-
Lymphocyte-activation gene 3
- TIM3:
-
T cell immunoglobulin and mucin-domain containing-3
- HLA:
-
Human Leukocyte Antigen
- DAPI:
-
4′,6-diamidino-2-phenylindole
- WES:
-
Whole Exome Sequencing
- RNA-seq:
-
RNA sequencing
- FPKM:
-
Fragments per kilobase million
- DEG:
-
Differentially expressed genes
- HNSCC:
-
Head and neck squamous cell carcinoma
- TIL:
-
Tumor-infiltrating lymphocyte
- APOBEC:
-
Apolipoprotein B mRNA editing catalytic polypeptide-like
- HPV:
-
Human papillomavirus
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Acknowledgements
This study was supported by a grant of the Korea Health Technology R&D Project “Strategic Center of Cell and Bio Therapy for Heart, Diabetes & Cancer” through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare (MHW), Republic of Korea (grant number : HI17C2085). This study was also supported by Seoul National University Hospital Research Fund (No. 03-2015-0380).
Funding
This study was supported by a grant of the Korea Health Technology R&D Project “Strategic Center of Cell and Bio Therapy for Heart, Diabetes & Cancer” through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare (MHW), Republic of Korea (Grant Number: HI17C2085). This study was also supported by Seoul National University Hospital Research Fund (No. 03-2015-0380).
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Conception and design: SHY, BK, CYO; Development of methodology: SHY, JY, BK, CYO, JIK; Acquisition of data: BK, MK, TMK, DWK, DSH; Analysis and interpretation of data: SHY, JY, SPH, BK, CYO, JK, SK; Administrative, technical, or material support: BK, YKJ, KCJ, JIK; Study supervision: BK, DSH; All authors read and approved the final manuscript.
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Yoo, S.H., Yun, J., Keam, B. et al. Discovery of acquired molecular signature on immune checkpoint inhibitors in paired tumor tissues. Cancer Immunol Immunother 70, 1755–1769 (2021). https://doi.org/10.1007/s00262-020-02799-y
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DOI: https://doi.org/10.1007/s00262-020-02799-y