Abstract
Background
Programmed cell death ligand-1 (PD-L1) and cytotoxic T-lymphocyte-associated antigen 4 (CTLA-4) play a pivotal role in cancer immunotherapy. Each of these molecules has a membrane-bound receptor form (mPD-L1/mCTLA-4) and a soluble form (sPD-L1/sCTLA-4). However, these prognostic impacts in colorectal cancer (CRC) remain unclear.
Methods
We immunohistochemically scored tumoral mPD-L1/mCTLA-4 expression and quantified preoperative circulating sPD-L1/sCTLA-4 levels using matched serum specimens from 131 patients with pStage I–III CRC. We also examined the association between these statuses and tumor infiltrating lymphocytes (TILs) in these patients.
Results
Elevated levels of mPD-L1, mCTLA-4, sPD-L1 and sCTLA-4 were significantly correlated with poor overall survival (OS) and disease-free survival (DFS). Co-high expression of tumoral mPD-L1 and mCTLA-4 or co-elevated levels of serum sPD-L1 and sCTLA-4 were strongly correlated with poor OS and DFS. Multivariate analysis revealed that both statuses were negative independent prognostic factors for OS [hazard ratio (HR) 3.86, 95% confidence interval (95% CI) 1.71–8.51, p = 0.001; HR 5.72, 95% CI 1.87–14.54, p = 0.004, respectively] and DFS (HR 2.53, 95% CI 1.23–4.95, p = 0.01; HR 6.88, 95% CI 2.42–17.13, p = 0.0008, respectively). Although low expression of tumoral mCTLA-4 was significantly correlated with increased CD8(+) TILs, there was no correlation in any other combination.
Conclusions
We verified the prognostic impacts of mPD-L1, mCTLA-4, sPD-L1 and sCTLA-4 in pStage I–III CRC patients. Dual evaluation of immune checkpoint molecules in primary tissues or preoperative serum could identify a patient population with poor prognosis in these patients.
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Abbreviations
- CRC:
-
Colorectal cancer
- CTLA-4:
-
Cytotoxic T-lymphocyte-associated antigen 4
- DFS:
-
Disease-free survival
- FFPE:
-
Formalin-fixed, paraffin-embedded
- HCC:
-
Hepatocellular carcinoma
- HR:
-
Hazard ratios
- mPD-L1:
-
Membrane-bound PD-L1
- mCTLA-4:
-
Membrane-bound CTLA-4
- MSI:
-
Microsatellite unstable
- MSS:
-
Microsatellite Stable
- OS:
-
Overall survival
- PD-1:
-
Programmed cell death-1
- PD-L1:
-
Programmed cell death ligand-1
- ROC:
-
Receiver operating characteristic
- sPD-L1:
-
Soluble PD-L1
- sCTLA-4:
-
Soluble CTLA-4
- TME:
-
Tumor microenvironment
- Treg cells:
-
Regulatory T cells
- TILs:
-
Tumor infiltrating lymphocytes
- TNM:
-
Tumor–Node–Metastasis
- 95% CI:
-
95% confidence interval
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Acknowledgements
We thank all the patients, their families, and the investigators involved in this study. We also thank Mrs. Yuki Orito and Mrs. Amphone Okada for their excellent technical assistance and R J Frampton from Edanz Group for editing a draft of this manuscript.
Funding
The work was partially supported by a Grant in Aid for Scientific Research (16K10533, 18K08592) from the Ministry of Education, Culture, Sports, Science, and Technology, Japan.
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Study conception and design: YuO, YT, YOO, and MK; acquisition and analysis of the data: YuO, YT, YoO, AY, CY, KK, YK, TS, SI, TK, HF, HY, JH, and MO; interpretation of the data: YUO, YT, and YOO; drafting of the manuscript: YUO, YT, YOO, and MK; critical revision of the manuscript: YUO, YT, YOO, AY, CY, KK, YK, TS, SI, TK, HF, HY, JH, MO, and MK.
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Supplementary Figure
1. Representative images of tumoral mPD-L1 and mCTLA-4 expression in CRC cells. (a–d) PD-L1; (a) absent (b) weak (c) moderate (d) strong, 100 × magnification (e–h) CTLA-4; (e) absent (f) weak (g) moderate (h) strong, 100 × magnification (PDF 490 kb)
Supplementary Figure
2. Representative images of PD-L1, CTLA-4, CD8 and FoxP3 (+) T cells with Cellsens software imaging system in CRC tissue. (a) PD-L1(+) T cells (b) CTLA-4(+) T cells, (c) CD8(+) T cells (d) FoxP3(+) T cells 100 × magnification (PDF 293 kb)
Supplementary Figure
3. Receiver operating characteristic (ROC) curve analysis for overall survival to decide the cut-off value of tumoral and circulating expression of immune checkpoints. (a) mPD-L1 (sensitivity: 0.92, specificity: 0.28, AUC: 0.57, cut-off: 4 (score of expression)) (b) mCTLA-4 (sensitivity: 0.48, specificity: 0.86, AUC: 0.65, cut-off: 6 (score of expression)) (c) sPD-L1 (sensitivity: 0.40, specificity: 0.86, AUC: 0.59, cut-off: 0.08 (ng/ml)) (d) sCTLA-4 (sensitivity: 0.32, specificity: 0.87, AUC: 0.51, cut-off: 1.79 (ng/ml)) (PDF 144 kb)
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Omura, Y., Toiyama, Y., Okugawa, Y. et al. Prognostic impacts of tumoral expression and serum levels of PD-L1 and CTLA-4 in colorectal cancer patients. Cancer Immunol Immunother 69, 2533–2546 (2020). https://doi.org/10.1007/s00262-020-02645-1
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DOI: https://doi.org/10.1007/s00262-020-02645-1