Human gut microbiome and risk for colorectal cancer

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Reviewed Marked as Reviewed by Claregrieve1 on 2023/01/4
study design
PMID PubMed identifier for scientific articles.
DOI Digital object identifier for electronic documents.
URI Uniform resource identifier for web resources.
Ahn J, Sinha R, Pei Z, Dominianni C, Wu J, Shi J, Goedert JJ, Hayes RB, Yang L
Journal of the National Cancer Institute
We tested the hypothesis that an altered community of gut microbes is associated with risk of colorectal cancer (CRC) in a study of 47 CRC case subjects and 94 control subjects. 16S rRNA genes in fecal bacterial DNA were amplified by universal primers, sequenced by 454 FLX technology, and aligned for taxonomic classification to microbial genomes using the QIIME pipeline. Taxonomic differences were confirmed with quantitative polymerase chain reaction and adjusted for false discovery rate. All statistical tests were two-sided. From 794217 16S rRNA gene sequences, we found that CRC case subjects had decreased overall microbial community diversity (P = .02). In taxonomy-based analyses, lower relative abundance of Clostridia (68.6% vs 77.8%) and increased carriage of Fusobacterium (multivariable odds ratio [OR] = 4.11; 95% confidence interval [CI] = 1.62 to 10.47) and Porphyromonas (OR = 5.17; 95% CI = 1.75 to 15.25) were found in case subjects compared with control subjects. Because of the potentially modifiable nature of the gut bacteria, our findings may have implications for CRC prevention.

Experiment 1

Reviewed Marked as Reviewed by Claregrieve1 on 2023/01/4

Curated date: 2021/12/07

Curator: Itslanapark

Revision editor(s): Itslanapark, Claregrieve1, WikiWorks


Location of subjects
United States of America
Host species Species from which microbiome was sampled (if applicable)
Homo sapiens
Body site Anatomical site where microbial samples were extracted from according to the Uber Anatomy Ontology
Feces Cow dung,Cow pat,Droppings,Dung,Excrement,Excreta,Faeces,Fecal material,Fecal matter,Fewmet,Frass,Guano,Matières fécales@fr,Merde@fr,Ordure,Partie de la merde@fr,Piece of shit,Porción de mierda@es,Portion of dung,Portion of excrement,Portion of faeces,Portion of fecal material,Portion of fecal matter,Portion of feces,Portion of guano,Portion of scat,Portionem cacas,Scat,Spoor,Spraint,Stool,Teil der fäkalien@de,Feces
Condition The experimental condition / phenotype studied according to the Experimental Factor Ontology
colorectal cancer cancer of colorectum,cancer of large bowel,cancer of large intestine,cancer of the large bowel,colon cancer,colorectal cancer,colorectum cancer,CRC,large intestine cancer,malignant colorectal neoplasm,malignant colorectal tumor,malignant colorectum neoplasm,malignant large bowel neoplasm,malignant large bowel tumor,malignant large intestine neoplasm,malignant large intestine tumor,malignant neoplasm of colorectum,malignant neoplasm of large bowel,malignant neoplasm of large intestine,malignant neoplasm of the large bowel,malignant neoplasm of the large intestine,malignant tumor of large bowel,malignant tumor of large intestine,malignant tumor of the large bowel,malignant tumor of the large intestine
Group 0 name Corresponds to the control (unexposed) group for case-control studies
controls with no cancer
Group 1 name Corresponds to the case (exposed) group for case-control studies
patients with adenocarcinoma
Group 1 definition Diagnostic criteria applied to define the specific condition / phenotype represented in the case (exposed) group
patients with newly diagnosed, histologically confirmed adenocarcinoma of the colon or rectum
Group 0 sample size Number of subjects in the control (unexposed) group
Group 1 sample size Number of subjects in the case (exposed) group
Antibiotics exclusion Number of days without antibiotics usage (if applicable) and other antibiotics-related criteria used to exclude participants (if any)
1 year

Lab analysis

Sequencing type
16S variable region One or more hypervariable region(s) of the bacterial 16S gene
Sequencing platform Manufacturer and experimental platform used for quantifying microbial abundance

Statistical Analysis

Statistical test
Mann-Whitney (Wilcoxon)
Significance threshold p-value or FDR threshold used for differential abundance testing (if any)
MHT correction Have statistical tests be corrected for multiple hypothesis testing (MHT)?
Matched on Factors on which subjects have been matched on in a case-control study
body mass index, sex
Confounders controlled for Confounding factors that have been accounted for by stratification or model adjustment
body mass index, sex, smoking behavior, race, age

Alpha Diversity

Pielou Quantifies how equal the community is numerically
Shannon Estimator of species richness and species evenness: more weight on species richness

Signature 1

Needs review

Curated date: 2021/12/10

Curator: Itslanapark

Revision editor(s): Itslanapark, Claregrieve1

Source: Table 1

Description: Differential microbial abundance between patients with colorectal cancer and control subjects

Abundance in Group 1: decreased abundance in patients with adenocarcinoma

NCBI Links
Clostridiales bacterium

Revision editor(s): Itslanapark, Claregrieve1