Patterns of Failure and the Need for Biliary Intervention in Resected Biliary Tract Cancers After Chemoradiation.

Abstract

This study assessed patterns of failure and rates of subsequent biliary intervention among patients with resected biliary tract cancers (BTCs) including gallbladder carcinoma (GBC) and extra- and intrahepatic cholangiocarcinoma (eCCA and iCCA) treated with adjuvant chemoradiation therapy (CRT). In this single-institution retrospective analysis of 80 patients who had GBC (n = 29), eCCA (n = 43), or iCCA (n = 8) treated with curative-intent resection and adjuvant CRT from 2007 to 2017, the median radiation dose was 50.4Gy (range 36-65Gy) with concurrent 5-fluorouracil (5-FU) chemotherapy. All but two of the patients received adjuvant chemotherapy. The 2-year locoregional failure (LRF), 2-yearrecurrence-free survival (RFS), and 2-yearoverall survival (OS), and univariate predictors of LRF, RFS, and OSwere calculated for the entire cohort and for a subgroup excluding patients with iCCA (n = 72). The predictors of biliary interventions also were assessed. Of the 80 patients (median follow-up period, 30.5months; median OS, 33.9months), 54.4% had American Joint Committee on Cancer (AJCC) stage 1 or 2 disease, 57.1% were lymphnode-positive, and 66.3% underwent margin-negative resection. For the entire cohort,2-year LRF was 23.8%, 2-yearRFSwas 43.7%, and 2-yearOS was62.1%. When patients with iCCA were excluded, the2-year LRF was22.6%, the 2-yearRFS was 43.9%, and the 2-year OS was 59.2%. In the overall and subgroup univariate analyses, lymph node positivity was associated with greaterLRF, whereas resection margin was not. Biliary intervention was required for 12 (63.2%) of the 19 patients with LRF versus 11 (18%) of the 61 patients without LRF (P < 0.001). Of the 12 patients with LRF who required biliary intervention, 4 died of biliary complications. The LRF rates remained significant despite adjuvant CRT. Lymph node positivity may be associated with increased risk of LRF. Positive margins were not associated with greater LRF, suggesting that CRT may mitigate LRF risk for this group. An association between LRF and higher rates of subsequent biliary interventions was observed, which may yieldsignificant morbidity. Novel strategies to decrease the rates of LRF should be considered.