Effects of prebiotics on immunologic indicators and intestinal microbiota structure in perioperative colorectal cancer patientsOriginal 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 randomized, double-blind, no-treatment parallel controlled trial tested whether prebiotics improve immune function and gut bacteria in colorectal cancer surgery patients. The prebiotic blend contained fructooligosaccharides, xylooligosaccharides, polydextrose, and resistant dextrin. Patients took 30 grams per day for 7 days before surgery, or nothing. Nutritional and immune markers were measured before and after surgery. Stool bacteria were profiled by sequencing the 16S ribosomal DNA V3-V4 region.
Who was studied?
The trial enrolled 140 perioperative colorectal cancer patients, 90 men and 50 women, aged 40 to 75 years, in China. They were split evenly into a prebiotic group and a control group of 70 each. Stool samples for microbiota analysis were collected from 40 patients randomly chosen across the two groups. All patients were undergoing surgery for colorectal cancer.
What were the most important findings?
Before surgery, prebiotics raised serum immunoglobulin G (P = 0.02), IgM (P less than 0.01), and transferrin (P = 0.027). After surgery, the prebiotic group showed higher IgG (P = 0.003), IgA (P = 0.007), CD3CD8 T cells (P = 0.043), and CD19 B cells (P = 0.012). Before surgery, prebiotics increased Bifidobacterium (P = 0.017) and Enterococcus (P = 0.02) and decreased Bacteroides (P = 0.04). Surgical stress reduced overall gut bacteria but raised some opportunistic pathogens, including Escherichia-Shigella after prebiotics postoperatively (P = 0.014).
What are the greatest implications of this study?
The results support giving prebiotics for 7 days before colorectal cancer surgery to strengthen serum immune markers. This offers a simple, low-cost supportive measure around the operation. Prebiotics also shifted the gut community, raising several commensal genera that include opportunistic pathogens while lowering Bacteroides. Bacteroides emerged as a key genus for further mechanistic study. The phylum-level microbiota differences were not statistically significant, so effects were mainly at the genus level and warrant larger confirmation.