Gallbladder microbiota composition is associated with pancreaticobiliary and gallbladder cancer prognosisOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
This study examined whether the bile microbiota in the gallbladder is associated with prognosis in pancreaticobiliary and gallbladder cancers. Researchers used 16S rRNA gene amplicon sequencing of the V3-V4 regions on bile juice from surgically resected gallbladders. Microbiome composition was compared by lesion location and cancer type using alpha and beta diversity. Cox regression linked microbial abundance to overall survival. The goal was to evaluate the microbiome as a prognostic biomarker.
Who was studied?
The cohort was 244 patients who had gallbladders surgically resected at Kagoshima University, Japan, between May 2009 and August 2018. Samples came from 96 bile duct lesions, 105 pancreas lesions, 14 gallbladder lesions, and 12 other lesions. Patients had cancers, cystic lesions, or inflammation of the pancreaticobiliary tract. Almost all patients did not receive antibiotics before surgery.
What were the most important findings?
Overall alpha and beta diversity did not differ significantly by lesion position or cancer type. However, Campylobacter, Citrobacter, Leptotrichia, Enterobacter, Hungatella, Mycolicibacterium, Phyllobacterium, and Sphingomonas differed significantly between patients with and without lymph node metastasis. Many microbes were significantly associated with overall survival. Strikingly, certain microbes signalled good prognosis in cholangiocarcinoma but poor prognosis in pancreatic adenocarcinoma, and vice versa. No single microbe correlated with prognosis in both lesion types.
What are the greatest implications of this study?
This is the first report linking gallbladder microbiota to pancreaticobiliary cancer prognosis. Threshold levels of specific microbes could help distinguish overall survival outcomes after surgery. The opposite prognostic direction across cancer types suggests the gallbladder environment shapes each lesion differently. The authors could not fully exclude contamination from gastric or duodenal juices, and the associations do not establish causation.