Abstract
Women with colorectal cancer (CRC) have survival advantages over men, yet the underlying mechanisms are unclear. T cell infiltration within the CRC tumor microenvironment (TME) correlates strongly with survival. We hypothesized that women with CRC have increased T cell infiltration and differential gene expression in the TME compared to men. Tissue microarrays comprising primary tumor, tumor infiltrated lymph nodes, and uninvolved colon were created from CRC patients. Proportions of CD4 positive (CD4+) and CD8 positive (CD8+) T cells were identified using immunohistochemistry. TME immune- and cancer-related genetic expression from primary and metastatic CRC tumor were also evaluated via the NanoStringIO360 panel and The Cancer Genome Atlas Project database. CD4+ was higher in tumor samples from women compared to men (22.04% vs. 10.26%, p=0.002) and also in lymph node samples (39.54% vs. 8.56%, p=0.001). CD8+ was increased in uninvolved colon from women compared to men (59.40% vs. 43.61%, p=0.015), and in stage I/II tumors compared to III/IV in all patients (37.01% vs. 23.91%, p=0.009). Top CD8+ tertile patients survived longer compared to the bottom (43.9 months vs. 25.3 months, p=0.007). Differential gene expression was observed in pathways related to Treg function, T cell activity, and T cell exhaustion, amongst several others, in women compared to men. Thus, significant sexual dimorphism exists in the TME that could contribute to survival advantages observed in female patients with CRC.
Original language | English (US) |
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Article number | 986103 |
Journal | Frontiers in Oncology |
Volume | 12 |
DOIs | |
State | Published - Oct 28 2022 |
Funding
Immunohistochemistry and TMA construction services provided by the Cancer Tissue Pathology Shared Resources was supported partly by the National Institute of General Medical Sciences Grant P20GM103639 and National Cancer Institute Grant P30CA225520 of the National Institutes of Health. Research reported in this publication was supported in part by the National Cancer Institute Cancer Center Support Grant P30CA225520 awarded to the University of Oklahoma Stephenson Cancer Center and used the Laboratory of Molecular Biology and Cytometry Research and the Biospecimen and Tissue Pathology Shared Resources. In addition, the work was also supported by the University of Oklahoma Health Sciences Department of Surgery. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
Keywords
- T cell
- colorectal cancer
- immunoscore
- sexual dimorphism
- tumor microenvironment
ASJC Scopus subject areas
- Oncology
- Cancer Research