Reliable evaluation of tumor-infiltrating lymphocytes in pancreatic cancer tissue biopsies

Oncotarget
Yoshinori InoNobuyoshi Hiraoka

Abstract

Tumor-infiltrating lymphocytes (TILs) represent cancer microenvironment. We previously reported TILs was prognosticators in pancreatic ductal adenocarcinoma (PDAC) patients by immunohistochemically measuring them in surgically-resected tissues. The aim of this study was to assess how best to evaluate TILs in PDAC tissue biopsies. First, we showed expression of CD3, CD4, or CD8 genes in PDAC tissue measured by quantitative RT-PCR (RT-qPCR) was prognostic using 241 surgically-resected specimens. We assessed whether the TILs in biopsied tissues can be effectively evaluated by comparing between immunohistochemistry and RT-qPCR. As a study model, we sampled twenty biopsies from surgically-resected PDAC specimen (n = 17). We investigated the variation levels of TILs in the different biopsies from the same specimen and evaluated using the intraclass correlation coefficient (ICC). The ICC value was 0.58 for CD3, 0.61 for CD4, and 0.46 for CD8, respectively; these ICC values meant correlations of "moderate" to "substantial" levels. To reach "near perfect", 3, 3, and 5 times biopsies were necessary for CD3, CD4, and CD8, respectively. When ICC values of immunolabeled TILs were of "low", ≥6 times biopsies were necessary to reach "moderate...Continue Reading

References

Sep 27, 2006·Clinical Cancer Research : an Official Journal of the American Association for Cancer Research·Nobuyoshi HiraokaSetsuo Hirohashi
Mar 16, 2012·Nature Reviews. Cancer·Wolf Herman FridmanJérôme Galon
Mar 23, 2012·Nature Reviews. Cancer·Drew M Pardoll
Sep 29, 2015·The New England Journal of Medicine·Hossein BorghaeiJulie R Brahmer
Jan 9, 2016·CA: a Cancer Journal for Clinicians·Rebecca L SiegelAhmedin Jemal
Jul 31, 2016·Breast Cancer Research : BCR·Nikita L ManiDavid L Rimm
Oct 11, 2016·The New England Journal of Medicine·Martin ReckUNKNOWN KEYNOTE-024 Investigators
Jul 6, 2017·The Lancet Oncology·Brian O'SullivanMary Gospodarowicz

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Methods Mentioned

BETA
surgical resection
biopsies
reverse transcription PCR
biopsy

Software Mentioned

Tissue Studio
StatView

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