Radiotherapy Yields Favourable Local Disease Control in Extrahepatic Bile Duct Cancer

In a 2026 retrospective study published in Clin Transl Oncol, researchers evaluated outcomes for patients with localised, unresectable or inoperable extrahepatic bile duct cancer treated with conventionally fractionated radiotherapy, finding that while the treatment provided favourable local disease control, tumour-related complications remained a major contributor to mortality.

Radiotherapy Yields Median Overall Survival of 18.3 Months

Most individuals in the cohort presented with perihilar bile duct cancer, receiving a median radiation dose of 54.0 Gy. The treatment protocols involved three-dimensional conformal radiotherapy in 55 patients and intensity modulated radiotherapy in the remaining 19 individuals. Furthermore, 57 patients also received concurrent chemotherapy during their course of care.

The study recorded a median overall survival of 18.3 months, alongside a median progression-free survival of 11.5 months. Estimated freedom from local progression reached 86.3% at 1 year and 36.2% at 2 years. Regarding treatment toxicity, investigators observed no instances of acute gastrointestinal toxicity of Grade 3 or higher. However, 8.1% of patients experienced late toxicity of Grade 3 or higher. Data revealed that radiation doses exceeding 54 Gy showed no significant association with improved freedom from local progression, progression-free survival, or overall survival.

Local Complications Cause 40% of Recorded Fatalities

Distant metastasis emerged as the most frequent first pattern of treatment failure, impacting 52.7% of patients, whereas locoregional progression accounted for 20.3%. Even though distant spread represented the predominant failure pattern, local complications posed a severe clinical challenge. Out of the 65 patients who died during the observation period, cholangitis, liver failure, and tumour bleeding directly caused 26 deaths, which accounts for at least 40.0% of all recorded fatalities. The authors pointed out that this proportion might actually be higher since exact causes of death were missing for a subset of patients.

Definitive radiotherapy offered favourable local control with acceptable toxicity in patients with unresectable extrahepatic bile duct cancer. However, the contribution of local complications to mortality supports further efforts to optimise local treatment alongside emerging systemic therapies.Y.J. Yoo and Jh. Park

Future clinical work must refine treatment strategies to effectively target both local complications and distant disease progression simultaneously.