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Tumor infiltrating lymphocytes: an intriguing player in the survival of colorectal cancer patients.

Deschoolmeester V, Baay M, Van Marck E, Weyler J, Vermeulen P, Lardon F, Vermorken JB - BMC Immunol. (2010)

Bottom Line: Colorectal cancer results from the cumulative effect of sequential genetic alterations, leading to the expression of tumor associated antigens possibly inducing a cellular anti-tumor immune response.Only early stage and young age (borderline significant for overall population only) were associated with a better overall survival (early disease with disease-free survival also).In conclusion our results suggest a role for infiltrating CD3+ and CD8+ T lymphocytes in colorectal cancer whereby tumor infiltration could reflect a general principle of antitumor immunity, irrespective of the MSI-status.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratory of Cancer Research and Clinical Oncology, Department of Medical Oncology, University of Antwerp (UA/UZA), Wilrijk, Belgium. vanessa.deschoolmeester@ua.ac.be

ABSTRACT

Background: There is growing evidence that both local and systemic inflammatory responses play an important role in the progression of a variety of solid tumors. Colorectal cancer results from the cumulative effect of sequential genetic alterations, leading to the expression of tumor associated antigens possibly inducing a cellular anti-tumor immune response. It is well recognized that cytotoxic lymphocytes constitute one of the most important effector mechanisms of anti-tumor-immunity. However, their potential prognostic influence in colorectal cancer remains controversial. Aim of the study was to examine infiltration of CD3+ and CD8+ lymphocytes in colorectal cancer and their prognostic potential.Two-hundred-fifteen colorectal cancer cases, previously analyzed for microsatellite instability (MSI), were selected for immunohistochemical detection of CD3+, CD8+ infiltration and the expression of granzyme B. Prognostic relevance was assessed by survival analysis.

Results: Strong correlations were found between the infiltration of lymphocytes and several clinicopathological variables. Survival analysis revealed that intra-epithelial infiltration of CD3+ and CD8+ T lymphocytes and stromal infiltration of CD3+ lymphocytes had a major impact on the patients' overall survival in the univariate analysis, however independent of their association with MSI-status. In addition, it was also demonstrated that there was an important disease specific survival advantage for patients with microsatellite stable (MSS) tumors containing intraepithelial CD8+ tumor infiltrating lymphocytes. When samples were analyzed for colon cancer and rectal cancer separately, the results of the overall population were confirmed in colon cancer only. When entered into a multiple Cox regression analysis adjusting for other possible important confounding factors, the strong impact of lymphocyte infiltration on overall survival was not maintained. Only early stage and young age (borderline significant for overall population only) were associated with a better overall survival (early disease with disease-free survival also).

Conclusions: In conclusion our results suggest a role for infiltrating CD3+ and CD8+ T lymphocytes in colorectal cancer whereby tumor infiltration could reflect a general principle of antitumor immunity, irrespective of the MSI-status.

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Related in: MedlinePlus

Immunohistochemical staining of lymphocyte infiltration in colorectal cancer. Examples of lymphocyte infiltration in colorectal tumors. A and C: CD8+ T cells infiltrating the invasive margin (A), the stroma (A and C) and in the cancer cell nests (C). B and D: CD3+ cells infiltrating the invasive margin (B), the stroma (B and D) and in the cancer cell nests (D).
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Figure 1: Immunohistochemical staining of lymphocyte infiltration in colorectal cancer. Examples of lymphocyte infiltration in colorectal tumors. A and C: CD8+ T cells infiltrating the invasive margin (A), the stroma (A and C) and in the cancer cell nests (C). B and D: CD3+ cells infiltrating the invasive margin (B), the stroma (B and D) and in the cancer cell nests (D).

Mentions: Semi-quantitative scoring of inflammatory infiltration of the three different tumor regions is shown in Table 2 and Figure 1. It is shown that infiltration of CD3+ T cells is most abundant in the invasive margin while infiltration of CD8+ cytotoxic T lymphocytes is strongest in the invasive margin and the stroma which means that in this study population, most T lymphocytes were found in the invasive margin but the cytotoxic T lymphocytes were also abundant in the stroma close to the tumor cells. The expression of granzyme B is much sparser. Approximately 50% of CD8+ T cells express their associated cytotoxic molecule granzyme B moderately/severely (see also CD8*GRB in Table 2 and Figure 2).


Tumor infiltrating lymphocytes: an intriguing player in the survival of colorectal cancer patients.

Deschoolmeester V, Baay M, Van Marck E, Weyler J, Vermeulen P, Lardon F, Vermorken JB - BMC Immunol. (2010)

Immunohistochemical staining of lymphocyte infiltration in colorectal cancer. Examples of lymphocyte infiltration in colorectal tumors. A and C: CD8+ T cells infiltrating the invasive margin (A), the stroma (A and C) and in the cancer cell nests (C). B and D: CD3+ cells infiltrating the invasive margin (B), the stroma (B and D) and in the cancer cell nests (D).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2864219&req=5

Figure 1: Immunohistochemical staining of lymphocyte infiltration in colorectal cancer. Examples of lymphocyte infiltration in colorectal tumors. A and C: CD8+ T cells infiltrating the invasive margin (A), the stroma (A and C) and in the cancer cell nests (C). B and D: CD3+ cells infiltrating the invasive margin (B), the stroma (B and D) and in the cancer cell nests (D).
Mentions: Semi-quantitative scoring of inflammatory infiltration of the three different tumor regions is shown in Table 2 and Figure 1. It is shown that infiltration of CD3+ T cells is most abundant in the invasive margin while infiltration of CD8+ cytotoxic T lymphocytes is strongest in the invasive margin and the stroma which means that in this study population, most T lymphocytes were found in the invasive margin but the cytotoxic T lymphocytes were also abundant in the stroma close to the tumor cells. The expression of granzyme B is much sparser. Approximately 50% of CD8+ T cells express their associated cytotoxic molecule granzyme B moderately/severely (see also CD8*GRB in Table 2 and Figure 2).

Bottom Line: Colorectal cancer results from the cumulative effect of sequential genetic alterations, leading to the expression of tumor associated antigens possibly inducing a cellular anti-tumor immune response.Only early stage and young age (borderline significant for overall population only) were associated with a better overall survival (early disease with disease-free survival also).In conclusion our results suggest a role for infiltrating CD3+ and CD8+ T lymphocytes in colorectal cancer whereby tumor infiltration could reflect a general principle of antitumor immunity, irrespective of the MSI-status.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratory of Cancer Research and Clinical Oncology, Department of Medical Oncology, University of Antwerp (UA/UZA), Wilrijk, Belgium. vanessa.deschoolmeester@ua.ac.be

ABSTRACT

Background: There is growing evidence that both local and systemic inflammatory responses play an important role in the progression of a variety of solid tumors. Colorectal cancer results from the cumulative effect of sequential genetic alterations, leading to the expression of tumor associated antigens possibly inducing a cellular anti-tumor immune response. It is well recognized that cytotoxic lymphocytes constitute one of the most important effector mechanisms of anti-tumor-immunity. However, their potential prognostic influence in colorectal cancer remains controversial. Aim of the study was to examine infiltration of CD3+ and CD8+ lymphocytes in colorectal cancer and their prognostic potential.Two-hundred-fifteen colorectal cancer cases, previously analyzed for microsatellite instability (MSI), were selected for immunohistochemical detection of CD3+, CD8+ infiltration and the expression of granzyme B. Prognostic relevance was assessed by survival analysis.

Results: Strong correlations were found between the infiltration of lymphocytes and several clinicopathological variables. Survival analysis revealed that intra-epithelial infiltration of CD3+ and CD8+ T lymphocytes and stromal infiltration of CD3+ lymphocytes had a major impact on the patients' overall survival in the univariate analysis, however independent of their association with MSI-status. In addition, it was also demonstrated that there was an important disease specific survival advantage for patients with microsatellite stable (MSS) tumors containing intraepithelial CD8+ tumor infiltrating lymphocytes. When samples were analyzed for colon cancer and rectal cancer separately, the results of the overall population were confirmed in colon cancer only. When entered into a multiple Cox regression analysis adjusting for other possible important confounding factors, the strong impact of lymphocyte infiltration on overall survival was not maintained. Only early stage and young age (borderline significant for overall population only) were associated with a better overall survival (early disease with disease-free survival also).

Conclusions: In conclusion our results suggest a role for infiltrating CD3+ and CD8+ T lymphocytes in colorectal cancer whereby tumor infiltration could reflect a general principle of antitumor immunity, irrespective of the MSI-status.

Show MeSH
Related in: MedlinePlus