Background: The CD274 (PD-L1)/PDCD1 (PD-1) immune checkpoint interaction may promote cancer progression, but the expression patterns and prognostic significance of PD-L1 and PD-1 in the colorectal cancer microenvironment are inadequately characterised.
Methods: We used a custom 9-plex immunohistochemistry assay to quantify the expression patterns of PD-L1 and PD-1 in macrophages, T cells, and tumour cells in 910 colorectal cancer patients. We evaluated cancer-specific mortality according to immune cell subset densities using multivariable Cox regression models.
Results: Compared to PD-L1 macrophages, PD-L1 macrophages were more likely M1-polarised than M2-polarised and located closer to tumour cells. PD-L1 macrophage density in the invasive margin associated with longer cancer-specific survival [P = 0.0004, HR for the highest vs. lowest quartile, 0.52; 95% CI: 0.34-0.78]. T cell densities associated with longer cancer-specific survival regardless of PD-1 expression (P < 0.005 for both PD-1 and PD-1 subsets). Higher densities of PD-1 T cell/PD-L1 macrophage clusters associated with longer cancer-specific survival (P < 0.005).
Conclusions: PD-L1 macrophages show distinct polarisation profiles (more M1-like), spatial features (greater co-localisation with tumour cells and PD-1 T cells), and associations with favourable clinical outcome. Our comprehensive multimarker assessment could enhance the understanding of immune checkpoints in the tumour microenvironment and promote the development of improved immunotherapies.
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http://dx.doi.org/10.1038/s41416-023-02238-6 | DOI Listing |
J Cancer Surviv
January 2025
The Daffodil Centre, The University of Sydney, A Joint Venture With Cancer Council NSW, 153 Dowling St, Woolloomooloo, Sydney, NSW, 2011, Australia.
Purpose: Knowledge about fear of cancer recurrence (FCR) among recurrence-free long-term colorectal cancer survivors (CRCS) is limited. This national cross-sectional study aimed to (1) assess the prevalence and correlates of FCR among CRCS; (2) investigate associations between colorectal cancer-specific symptoms and FCR; and (3) identify predictors of interest in engaging in FCR treatment.
Methods: We identified 9638 living Danish CRCS, age above 18 years, diagnosed between 2014 and 2018 through the Danish Clinical Registries.
Sports Med Open
January 2025
Institute of Primary Care, University of Zurich, Zurich, Switzerland.
Background: Marathon training and running have many beneficial effects on human health and physical fitness; however, they also pose risks. To date, no comprehensive review regarding both the benefits and risks of marathon running on different organ systems has been published.
Main Body: The aim of this review was to provide a comprehensive review of the benefits and risks of marathon training and racing on different organ systems.
Cell Death Differ
January 2025
Department of Pathology and International Institutes of Medicine, The Fourth Affiliated Hospital (Yiwu), Zhejiang University School of Medicine, Hangzhou, 310058, China.
Cancer stem cells (CSCs) typically reside in perivascular niches, but whether endothelial cells of blood vessels influence the stemness of cancer cells remains poorly understood. This study revealed that endothelial cell-specific GLTSCR1 deletion promotes colorectal cancer (CRC) tumorigenesis and metastasis by increasing cancer cell stemness. Mechanistically, knocking down GLTSCR1 induces the transformation of endothelial cells into tip cells by regulating the expression of Neuropilin-1 (NRP1), thereby increasing the direct contact and interaction between endothelial cells and tumour cells.
View Article and Find Full Text PDFJ Dr Nurs Pract
January 2025
Texas A&M University, Corpus Christi, TX, USA.
Colorectal cancer (CRC) is a leading cause of cancer-related deaths in the United States despite the availability of effective preventive screening. This project was designed as a community awareness initiative to increase CRC awareness, knowledge, and intent to discuss and complete CRC screening. This quasi-experimental study had a QI focus and used a convenience sample in a public setting assessing CRC awareness, knowledge, and intent to discuss and complete screening after participating in an inflatable colon tour.
View Article and Find Full Text PDFGut
January 2025
Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China
Background: Fasting-mimicking diet (FMD) boosts the antitumour immune response in patients with colorectal cancer (CRC). The gut microbiota is a key host immunity regulator, affecting physiological homeostasis and disease pathogenesis.
Objective: We aimed to investigate how FMD protects against CRC via gut microbiota modulation.
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