Abstract
Introduction
While generally associated with poor prognosis, intrahepatic cholangiocarcinoma (ICC) can have a heterogeneous presentation and natural history. We sought to identify specific ICC subtypes that may be associated with varied long-term outcomes and patterns of recurrence after liver resection.
Methods
Patients who underwent curative-intent resection for ICC from 2000 to 2020 were identified from a multi-institutional database. Hierarchical cluster analysis characterized three ICC subtypes based on morphology (i.e., tumor burden score [TBS]) and biology (i.e., preoperative neutrophil-to-lymphocyte ratio [NLR] and CA19-9 levels).
Results
Among 598 patients, the cluster analysis identified three ICC subtypes: Common (n = 300, 50.2%) (median, TBS: 4.5; NLR: 2.4; CA19-9: 38.0 U/mL); Proliferative (n = 246, 41.1%) (median, TBS: 8.8; NLR: 2.9; CA19-9: 71.2 U/mL); Inflammatory (n = 52, 8.7%) (median, TBS: 5.4; NLR: 12.6; CA19-9: 26.7 U/mL). Median overall survival (OS) (Common: 72.0 months; Proliferative: 31.4 months; Inflammatory: 22.9 months) and recurrence-free survival (RFS) (Common: 21.5 months; Proliferative: 11.9 months; Inflammatory: 9.0 months) varied considerably among the different ICC subtypes (all p < 0.001). Even though patients with Inflammatory ICC had more favorable T-(T1/T2, Common: 84.4%; Proliferative: 80.6%; Inflammatory: 86.5%) and N-(N0, Common: 14.0%; Proliferative: 20.7%; Inflammatory: 26.9%) disease, the Inflammatory subtype was associated with a higher incidence of intra- and extrahepatic recurrence (Common: 15.8%; Proliferative: 24.2%; Inflammatory: 28.6%) (all p = 0.01).
Conclusions
Cluster analysis identified three distinct subtypes of ICC based on TBS, NLR, and CA19-9. ICC subtype was associated with RFS and OS and predicted worse outcomes among patients. Despite more favorable T- and N-disease, the Inflammatory ICC subtype was associated with worse outcomes ICC subtype should be considered in the prognostic stratification of patients.
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10434_2022_12795_MOESM1_ESM.tiff
Supplementary Figure S1. Multiple density plots of overall survival stratified by T-category.a, Overall survival for the entire cohort. b, Overall survival for Common ICC. c, Overall survival for Proliferative ICC. d, Overall survival for Inflammatory ICC. OS, overall survival (months after surgery). (TIFF 5659 KB)
10434_2022_12795_MOESM2_ESM.tiff
Supplementary Figure S2. Multiple density plots of overall survival stratified by N-category.a, Overall survival for the entire cohort. b, Overall survival for Common ICC. c, Overall survival for Proliferative ICC. d, Overall survival for Inflammatory ICC. OS, overall survival (months after surgery). (TIFF 5659 KB)
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Alaimo, L., Moazzam, Z., Endo, Y. et al. Long-Term Recurrence-Free and Overall Survival Differ Based on Common, Proliferative, and Inflammatory Subtypes After Resection of Intrahepatic Cholangiocarcinoma. Ann Surg Oncol 30, 1392–1403 (2023). https://doi.org/10.1245/s10434-022-12795-4
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DOI: https://doi.org/10.1245/s10434-022-12795-4