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2022 Fiscal Year Final Research Report

Analysis of fibrosis of cancer stroma in the hepatobiliary and pancreatic tumors.

Research Project

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Project/Area Number 20K08996
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 55010:General surgery and pediatric surgery-related
Research InstitutionDoshisha University

Principal Investigator

Iwaisako Keiko  同志社大学, 生命医科学部, 教授 (70625300)

Co-Investigator(Kenkyū-buntansha) 趙 向東  京都大学, ウイルス・再生医科学研究所, 特定助教 (00444464)
瀬尾 智  京都大学, 医学研究科, 客員研究員 (70646546)
Project Period (FY) 2020-04-01 – 2023-03-31
Keywords線維化 / 肝内胆管癌 / 癌免疫 / 腫瘍浸潤リンパ球
Outline of Final Research Achievements

Hepatobiliary pancreatic cancer has a poor prognosis. Histopathologically, tumor tissues show "fibrosis of the carcinoma stroma. In this study, intrahepatic cholangiocarcinoma, a malignant tumor of hepatic origin with a high degree of fibrosis of the stroma, was analyzed immunohistologically for collagen and tumor infiltrating immune cells to examine their relationship with prognosis. The collagen was predominantly type 1 and 3, and the percentage of type 3 was higher than that of normal liver tissue. However, there was no correlation between the percentage of type 3 and prognosis. The number of infiltrating lymphocytes (CD8+ T cells, CD4+ T cells, and CD20+ B cells) was better prognosis (overall survival and recurrence-free survival) with more cells. These results suggest that cancer-specific immunity to intrahepatic cholangiocarcinoma was induced at the time of surgery and contributed to the prevention of postoperative recurrence and metastasis.

Free Research Field

肝臓学

Academic Significance and Societal Importance of the Research Achievements

予後不良な肝臓原発のがんである肝内胆管がんには、手術以外に有効な治療法がない。手術で切除された癌の組織を性状解析することにより、治療標的を見出し、有効な治療法開発につなげることを目的として行われた研究である。近年、新たながんの治療法として確立された免疫チェックポイント阻害薬の有効性について、薬物ががん細胞に辿り着くのを阻害すると考えられている間質の線維の状態や免疫チェックポイント阻害薬によって賦活化されるキラーT細胞の存在などを明らかにした。線維化は予後不良因子ではなく、キラーT細胞の浸潤が多いほど予後が良好であったことから、肝内胆管がんに対してもがん免疫療法が適応となる可能性がある。

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Published: 2024-01-30  

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