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Peri-hilar cholangiocarcinoma (pCCA) is chemorefractory and limited genomic analyses have been undertaken in Western idiopathic disease. We undertook comprehensive genomic analyses of a U.K. idiopathic pCCA cohort to characterize its mutational profile and identify new targets. Whole exome and targeted DNA sequencing was performed on forty-two resected pCCA tumors and normal bile ducts, with Gene Set Enrichment Analysis (GSEA) using one-tailed testing to generate false discovery rates (FDR). 60% of patients harbored one cancer-associated mutation, with two mutations in 20%. High frequency somatic mutations in genes not typically associated with cholangiocarcinoma included mTOR, ABL1 and NOTCH1. We identified non-synonymous mutation (p.Glu38del) in MAP3K9 in ten tumors, associated with increased peri-vascular invasion (Fisher's exact, p < 0.018). Mutation-enriched pathways were primarily immunological, including innate Dectin-2 (FDR 0.001) and adaptive T-cell receptor pathways including PD-1 (FDR 0.007), CD4 phosphorylation (FDR 0.009) and ZAP70 translocation (FDR 0.009), with overlapping HLA genes. We observed cancer-associated mutations in over half of our patients. Many of these mutations are not typically associated with cholangiocarcinoma yet may increase eligibility for contemporary targeted trials. We also identified a targetable MAP3K9 mutation, in addition to oncogenic and immunological pathways hitherto not described in any cholangiocarcinoma subtype., (© 2023. The Author(s).)

Background: Resection margin status is a known prognosticator in patients who undergo resection for hilar cholangiocarcinoma. However, the influence of an isolated positive circumferential margin on clinical outcome is unclear., Methods: Patients with resected de novo hilar cholangiocarcinoma from two European hepatobiliary centres (Medical University of Vienna and Aintree University Hospital, 2006-2016) were classified according to resection margin status (negative, surgically positive, isolated circumferentially positive) and investigated with respect to overall survival (OS), recurrence-free survival (RFS) and recurrence pattern., Results: Eighty-three (48 male/35 female) patients were enrolled. The median age was 64 years (range 33-80). The median follow-up was 21.7 months (range 0.3-92.4). Forty (48%) patients had negative resection margins, 25 (30%) had an isolated positive circumferential margin and 18 (22%) had a positive surgical margin. The 5-year OS rates in patients with negative, isolated positive circumferential and positive surgical resection margins were 47%, 33% and 0%, respectively. Median OS was 45.6, 32.7 and 14.5 months, respectively (log rank, P = 0.011). Upon multivariable Cox regression analysis, resection margin status and lymph node status remained statistically significant (P < 0.05). No difference with respect to RFS and recurrence pattern was found between the groups (P > 0.05)., Conclusion: Our data show that these three resection margin types were associated with different clinical outcomes. Circumferential margin status may therefore serve as a novel prognostic biomarker.

Background: Liver transplantation in patients with unresectable early-stage (<3 cm, node negative) hilar cholangiocarcinoma has been recently reported to be associated with longer survival compared to liver resection and therefore suggested as potential treatment option also in resectable disease. Here, we investigated the outcome of resection in early-stage tumours as the standard of care in an experienced European centre., Methods: Patients with de novo resectable hilar cholangiocarcinomas who underwent liver resection between mid-2009 and December 2017 were classified as early-stage (<3 cm and node negative) or later-stage tumours (≥3 cm and/or node positive), and were investigated with respect to clinical outcome., Results: Fifty-six patients were analyzed of whom 17 had early-stage tumours and 39 had later-stage tumours. The sex ratio (m:f) was 30:26. The median age was 65 years (range 33-80). The median follow-up was 17.0 months (range 0.7-92.4). 5-year overall survival (OS) rates were 82% in patients with early-stage tumours and 23% in patients with later-stage tumours, respectively. Median OS was 89.9 months and 27.6 months, respectively (HR 0.25 (95% CI 0.08-0.84), P = 0.024)., Conclusions: In an experienced European centre, 5-year survival rates after liver resection for early-stage hilar cholangiocarcinoma are comparable with reported outcomes after transplantation. The results of this study question the value of liver transplantation in this setting, especially with respect to the shortage of transplantable organs worldwide., (Copyright © 2018 Elsevier Ltd, BASO ~ The Association for Cancer Surgery, and the European Society of Surgical Oncology. All rights reserved.)