%0 Journal Article %T T cell receptor ¦Â©\chain repertoire analysis of tumor©\infiltrating lymphocytes in pancreatic cancer %A Bin Dong %A Can Cui %A Chaoting Zhang %A Chunyi Hao %A Jianhui Wu %A Min Zhao %A Qin Tan %A Xiaoya Guan %A Xiuyun Tian %A Zheming Lu %J Archive of "Cancer Science". %D 2019 %R 10.1111/cas.13877 %X Pancreatic cancer is lethal due to lack of perceptible symptoms and effective treatment methods. Immunotherapy may provide promising therapeutic choices for malignant tumors like pancreatic cancer. Tumor©\infiltrating lymphocytes (TIL) in tumor mesenchyme could recognize peptide antigens presented on the surface of tumor cells. The present study aimed to test the relationship between the T cell receptor (TCR) ¦Â repertoire of the tumor and peripheral blood, and also to investigate the intra©\tumor spatial heterogeneity of the TCR ¦Â repertoire in pancreatic cancer. To the best of our knowledge, this is the first study to evaluate the clonal composition of TCR ¦Â repertoire in TIL across the spatial extent of pancreatic cancer. In this study, we studied 5 patients who were diagnosed with primary pancreatic cancer. Ultra©\deep sequencing was used to assess the rearrangement of the TCR ¦Â©\chain (TCR ¦Â) gene. HE staining and immunohistochemistry of CD3, CD4, CD8 and HLA class I were used to show histopathology and immune conditions macroscopically. TIL repertoire showed that different regions of the same tumor showed a greater number of repertoire overlaps between each other than between peripheral blood, which suggested that T cell clones in pancreatic cancer might be quite different from those in peripheral blood. In contrast, intra©\tumoral TCR ¦Â repertoires were spatially homogeneous between different regions of a single tumor tissue. Based on these results, we speculated that the cellular adaptive immune response in pancreatic cancer was spatially homogeneous; this may pave the way for immunotherapy for the treatment of pancreatic cancer patients %K immunohistochemistry %K intra©\tumor spatial heterogeneity %K pancreatic cancer %K T cell receptor %K ultra©\deep sequencing %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6317932/