Cell Counts, rather than Proportion, of CD8/PD-1 Tumor-Infiltrating Lymphocytes in a Tumor Microenvironment Associated with Pathological Characteristics of Chinese Invasive Ductal Breast Cancer.

J Immunol Res 2019 31;2019:8505021. Epub 2019 Mar 31.

Department of Cancer Research, Beijing Shijitan Hospital, Capital Medical University, Beijing 100038, China.

Objective: This study is aimed at investigating the association of exhausted CD8 tumor-infiltrating lymphocytes with clinic-pathological factors.

Methods: 133 patients diagnosed with primary invasive ductal breast cancer were recruited into the cross-sectional study consecutively. Immunohistochemistry was used to detect biomarker expression on formalin-fixed and paraffin-embedded sections. Double staining of CD8 and PD-1 was conducted on lymphocytes.

Results: The proportion of CD8/PD-1 TILs was 16% among patients with axillary lymph node metastasis, significantly lower than those without metastasis (24%). The expression of CK7, CK20, or Ki-67 was not related with the proportion of phenotypes of CD8/PD-1 TILs. Younger patients had more cell counts of CD8/PD-1 TILs than elderly patients (18/HPF vs. 9/HPF, < 0.05). Patients with axillary lymph node metastasis had less CD8/PD-1 TILs than those without metastasis (11/HPF vs. 27/HPF, < 0.05). Median counts of CD8/PD-1 TILs among patients with CK20 and E-Cad expression were 33/HPF and 14/HPF, significantly higher than those among patients with negative CK20 (16/HPF) and E-Cad expression (6/HPF). Ki-67 index had a significant correlation with cell counts of CD8/PD-1 TILs and CD8/PD-1 TILs, and the correlation coefficients were 0.19 and 0.21 ( < 0.05), respectively.

Conclusion: The proportion of CD8/PD-1 TILs was related with metastatic status of the axillary lymph node but cell counts of CD8/PD-1 TILs were related with metastatic status of the axillary lymph node and expression of CK7, CK20, E-Cad, and Ki-67. Absolute cell counts, not proportion of CD8/PD-1 TILs, were more likely to distinguish clinic and pathologic characteristics of breast cancer.

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http://dx.doi.org/10.1155/2019/8505021DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6462317PMC
August 2019
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References

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Current Topics in Microbiology and Immunology 2017

The Yale journal of biology and medicine 2011

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