The potential of fecal microbiota and amino acids to detect and monitor patients with adenomaOriginal 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 fecal microbiota composition and fecal amino acid levels change in the presence of colonic adenomas and after those adenomas are removed. Researchers longitudinally tracked stool samples collected before colonoscopy and again three months after polypectomy. The goal was to determine whether microbial and amino acid signals could help detect adenomas and monitor patients after endoscopic removal, given that surveillance colonoscopy has low yield and interval colorectal cancers still occur.
Who was studied?
The study included patients with advanced adenomas and nonadvanced adenomas (0.5 to 1.0 cm) who underwent polypectomy during colonoscopy, totaling 19 patients. These patients were strictly matched on age, body-mass index, and smoking habits to 19 control participants who had no endoscopic abnormalities. Fecal samples were collected from both groups before bowel preparation, and microbial taxa were profiled by 16S rRNA sequencing while amino acids were measured by high-performance liquid chromatography.
What were the most important findings?
Adenoma patients could be distinguished from controls based on both their amino acid profiles and their microbial composition. Levels of proline, ornithine, and serine were significantly increased in adenoma patients compared to controls, and these three amino acids together formed a candidate adenoma-specific panel with an AUC of 0.79. After endoscopic removal of the adenomas, levels of these amino acids decreased and came to resemble those seen in controls, suggesting the changes were tied to the presence of the lesion itself rather than fixed host traits. The abstract does not mention Desulfovibrio, sulfate-reducing bacteria, or sulfur metabolism among the described findings.
What are the greatest implications of this study?
These findings suggest that fecal amino acid panels, potentially combined with microbial composition data, could serve as a noninvasive tool to help detect adenomas and monitor patients after polypectomy. Because these markers normalized after adenoma removal, they may also help confirm successful resection or flag patients who need closer follow-up. This approach could complement or improve upon current endoscopic surveillance strategies, which have low yield despite the continued occurrence of interval colorectal cancers.