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Levels of different subtypes of tumour-infiltrating lymphocytes correlate with each other, with matched circulating lymphocytes, and with survival in breast cancer. | LitMetric

AI Article Synopsis

  • The study investigates the relationship between different types of immune cells (lymphocytes) that infiltrate breast cancer tumors and various clinical factors, including patient survival.
  • Researchers used immunohistochemistry to analyze the presence of different lymphocyte subtypes (CD20+, CD4+, CD8+, FoxP3+) in tumor samples from 62 patients, correlating these levels with patient characteristics and matching them to circulating lymphocyte levels.
  • Findings reveal that the types and locations of these lymphocytes have distinct effects on tumor behavior, with certain subtypes linked to better or worse survival outcomes depending on hormone receptor status in the tumors.

Article Abstract

Purpose: Breast cancer tumour-infiltrating lymphocytes associate with clinico-pathological factors, including survival, although the literature includes many conflicting findings. Our aim was to assess these associations for key lymphocyte subtypes and in different tumour compartments, to determine whether these provide differential correlations and could, therefore, explain published inconsistencies. Uniquely, we also examine whether infiltrating levels merely reflect systemic lymphocyte levels or whether local factors are predominant in recruitment.

Methods: Immunohistochemistry was used to detect tumour-infiltrating CD20+ (B), CD4+ (helper T), CD8+ (cytotoxic T) and FoxP3+ (regulatory T) cells in breast cancers from 62 patients, with quantification in tumour stroma, tumour cell nests, and tumour margins. Levels were analysed with respect to clinico-pathological characteristics and matched circulating levels (determined by flow-cytometry).

Results: CD4+ lymphocytes were the most prevalent subtype in tumour stroma and at tumour edge and CD8+ lymphocytes were most prevalent in tumour nests; FoxP3+ lymphocytes were rarest in all compartments. High grade or hormone receptor negative tumours generally had significantly increased lymphocytes, especially in tumour stroma. Only intra-tumoural levels of CD8+ lymphocytes correlated significantly with matched circulating levels (p < 0.03), suggesting that recruitment is mainly unrelated to systemic activity. High levels of stromal CD4+ and CD20+ cells associated with improved survival in hormone receptor negative cases (p < 0.04), while tumour nest CD8+ and FoxP3+ cells associated with poor survival in hormone receptor positives (p < 0.005).

Conclusions: Lymphocyte subtype and location define differential impacts on tumour biology, therefore, roles of tumour-infiltrating lymphocytes will only be unravelled through thorough analyses that take this into account.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7376517PMC
http://dx.doi.org/10.1007/s10549-020-05757-5DOI Listing

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