부산대학교 도서관

Background: Intrahepatic cholangiocarcinoma (ICC) has a high recurrence rate and a poor prognosis. Thus, the development of effective treatment and prognostic biomarkers is required. High expression of diacylglycerol kinase alpha (DGKα) is a prognostic factor for the recurrence of hepatocellular carcinoma. However, the relationship between DGKα expression and prognosis in ICC has not been reported. Methods: Immunohistochemistry (IHC) with anti‐DGKα antibody was performed on surgical specimens of ICC (n = 69). First, DGKα expression in cancer cells was qualitatively classified into four groups (−, 1+, 2+, 3+) and divided into two groups (DGKα− and DGKα+1 + to 3+). The relationship between clinical features and DGKα expression was analyzed. Second, Ki‐67 expression was evaluated as a cell proliferation marker. The number of Ki‐67‐positive cells was counted, and the relationship with DGKα expression was examined. Results: DGKα IHC divided the patients into a DGKα+ group (1+: n = 15; 2+: n = 5; 3+: n = 5) and a DGKα− group (−: n = 44). In the DGKα+ group, patients were older and had advanced disease. Both overall survival and recurrence‐free survival (RFS) were significantly worse in the DGKα+ patients. DGKα+ was identified as an independent prognostic factor for RFS by multivariate analysis. Furthermore, the number of Ki‐67‐positive cells increased in association with the staining levels of DGKα. Conclusion: Pathological DGKα expression in ICC was a cancer proliferation marker associated with recurrence. This suggests that DGKα may be a potential therapeutic target for ICC. [ABSTRACT FROM AUTHOR]