Association of Optimal Time Interval to Re-resection for Incidental Gallbladder Cancer With Overall Survival: A Multi-Institution Analysis From the US Extrahepatic Biliary Malignancy Consortium
Across ten US centres, people whose second operation for a chance-found gallbladder cancer happened four to eight weeks after the first lived longest; rushing back in under four weeks, or waiting beyond eight, went with shorter survival.
Overview
Cohort of 207 patients with incidentally discovered gallbladder cancer (46 percent of 449 gallbladder cancers) who underwent reoperation at 10 US academic institutions between 2000 and 2014, grouped by interval from cholecystectomy: under 4 weeks (25 patients, 12 percent), 4 to 8 weeks (91, 44 percent) and over 8 weeks (91, 44 percent). Groups were similar in demographics, extent of resection, residual disease, T stage, margins, nodes and complications. Median overall survival was 17.4, 40.4 and 22.4 months (log-rank p=0.03). On multivariable analysis the early (hazard ratio 2.63, 95 percent CI 1.25 to 5.54) and late (2.07, 1.17 to 3.66) intervals, R2 resection (2.69) and advanced T stage (1.85) remained associated with death.
- Median overall survival 40.4 months for re-resection at 4 to 8 weeks vs 17.4 months under 4 weeks and 22.4 months over 8 weeks (p=0.03).
- Multivariable hazard ratio 2.63 (95 percent CI 1.25 to 5.54) for under 4 weeks and 2.07 (1.17 to 3.66) for over 8 weeks, against 4 to 8 weeks.
The origin of the widely quoted four-to-eight-week window for re-resection. A 2026 individual patient data meta-analysis found no survival difference by timing, so the window is a reasonable planning target rather than a proven rule.
- Retrospective; timing may reflect referral patterns and disease behaviour rather than cause survival.
- Only 25 patients in the under-4-weeks group.
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