Abstract
Introduction/Background
Colorectal carcinoma (CRC) is a common malignancy, with its diverse clinical, pathological, and molecular features. The immune microenvironment of a tumor comprises of interplay between various cells and molecules, and has a significant role in deciding the tumor behavior and overall prognosis. PD-L1 (programmed cell death ligand-1) has been implicated in the regulation of the tumor immune microenvironment (TIME). There is limited data regarding the correlation of PD-L1 expression with immune cell profile in CRCs, especially in the Indian setting. The study aimed to assess the PD-L1 expression in CRC tumor cells and its association with TIME, mismatch repair (MMR), and various other clinicopathological parameters.
Methods
This is a hospital-based, cross-sectional observational study. PD-L1 expression was assessed at the protein level by immunohistochemistry and mRNA level by qRT-PCR. Immune cell markers (CD4, CD8, CD20, FOXP3, and CD163) were interpreted using the ImageJ Fiji platform.
Results
Of the 104 cases, 21% were PD-L1 positive and were more common in right-sided CRCs. PD-L1 positive cases showed significantly higher concentrations of all T-cell subsets (CD4+ , CD8+ , and FOXP3+), CD20+ B-cells, and CD163+ macrophages were noted. No statistical significance was seen between PD-L1 expression with clinical profile, pathological subtype, grade or stage, mismatch repair status (proficient vs deficient), and survival.
Conclusions
The present study showed a relatively lower frequency of PD-L1 in CRC from the Eastern Indian cohort. The immune cell concentration in the present study was calculated using image analysis-based objectivised methods. Significant correlation of PD-L1 expression in tumor cells with the tumor-infiltrating immune cells indicated its crucial role in the pathobiology of CRC especially by regulating the TIME. Considering the therapeutic implication of PD-L1 in various malignancies, it may be one of the crucial therapeutic targets in a proportion of cases.
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Data Availability
The master data sheet used to arrive at the conclusions of the study is available with the corresponding author, and the same may be made available, upon reasonable request.
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Acknowledgements
I would like to express my sincere gratitude towards all my teachers and colleagues from All India Institute of Medical Sciences, Bhubaneswar, for their mental support during the study. I would like to express my sincere gratitude to Dr. Mukund Namdev Sable, Additional Professor, for providing the kits for mRNA analysis, and Dr. Kirtal Hansdah and Dr. Swetasmita Mishra, the scientists at the molecular lab, and Mr. Samiur Rahman, for the technical aspects. My sincere gratitude towards all the technical staff of the Histopathology Division of the Department of Pathology, AIIMS Bhubaneswar, for their help with all the technical works related to the study, and to the participants of the study. I would acknowledge the creators of the ImageJ (Fiji) software, which is made available free of cost, without which this study would not have been possible.
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Authors and Affiliations
Contributions
Prefix | Author name | Name abbreviation |
---|---|---|
Dr. | Mohammed Shahin | MS |
Dr. | Susama Patra | SP |
Dr. | Suvendu Purkait | SuP |
Dr. | Madhabananda Kar | MK |
Dr. | Saroj Kumar Das Majumdar | SKM |
Dr. | Tushar Subhadarshan Mishra | TSM |
Dr. | Subash Chandra Samal | SCS |
Dr. | Hemanta Kumar Nayak | HKN |
• All the authors contributed to the study’s conception and design.
• Material preparation, data collection, and analysis were performed by Mohammed Shahin, Susama Patra, and Suvendu Purkait.
• Case management data and specimens were provided by Madhabananda Kar, Saroj Kumar Das Majumdar, Tushar Subhadarshan Mishra, Subash Chandra Samal, and Hemanta Kumar Nayak.
• Case follow-up data were provided by Madhabananda Kar and Saroj Kumar Das Majumdar.
• The first draft of the manuscript was written by Mohammed Shahin, and initially assessed by Susama Patra and Suvendu Purkait.
• Histopathological evaluation and IHC interpretation were done by Mohammed Shahin, Susama Patra, and Suvendu Purkait.
• The master chart was prepared by Mohammed Shahin and statistical analysis was performed by Suvendu Purkait
• All other previous versions were commented upon, and approved by all the authors.
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Ethical approval has been taken from the AIIMS Bhubaneswar Institutional Ethics Committee in February 2020.
Consent to Participate
Informed consent was obtained from all the individual participants included in the study, before their routine diagnostic evaluation and surgical procedure.
Consent to Publish
The authors declare that the participants have provided consent for the publication of images. However, only images of the histopathology slides, IHCs, and ImageJ were included in the study, and duly acknowledged.
Competing Interests
The authors declare no competing interests.
Credits
This paper was presented at the Indian Association of Pathologists and Microbiologists Annual Conference APCON 2022, held in Bengaluru, India, in December 2022, in the “Best Award Paper” category.
The initial abstract of the study was published in the Indian Journal of Pathology and Microbiology. 65(Suppl 2): S1, November 2022.
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Shahin, M., Patra, S., Purkait, S. et al. PD-L1 Expression in Colorectal Carcinoma Correlates with the Immune Microenvironment. J Gastrointest Canc (2024). https://doi.org/10.1007/s12029-024-01049-z
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DOI: https://doi.org/10.1007/s12029-024-01049-z