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Despite the characterization of many aetiologic genetic changes. The specific causative factors in the development of sporadic colorectal cancer remain unclear. This study was performed to detect the possible role of Enteropathogenic Escherichia coli (EPEC) in developing colorectal carcinoma.
Fresh biopsy specimens have been obtained from the colonic mucosa overlying the colorectal cancer as well as from the colon of the healthy controls. Culture, genotyping and virulence of EPEC were done using (nutrient broth culture, and PCR). Strains biochemically identified as E. coli were selected from the surface of a MacConkey's plate and were serogrouped by slide agglutination tests
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| group 1 | colonoscopic biopsies from patients with colorectal cancer patients |
| |
| (Group 2 | colonoscopic biopsies from healthy controls |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| colonoscopic biopsies | Other |
|
| Measure | Description | Time Frame |
|---|---|---|
| virulence genes: eaeA, bfpA and stx. PCR | E. coli colonies isolated from the mucosa of colorectal cancers and from healthy controls were harvested and subjected to DNA extraction (QIAGEN) | 1 week |
| Measure | Description | Time Frame |
|---|---|---|
| EPEC serogrouping: | Strains biochemically identified as E. coli were selected from the surface of a MacConkey's plate and were serogrouped by slide agglutination tests to detect EPEC using O-specific nonavalent E.coli antiserum (O26, O55, O86, O111, O114, O119, O124, O125, O126, O127, O128, O142), according to the manufacturer's instructions (Bio-Rad). | 1 week |
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Inclusion Criteria:
Exclusion Criteria:
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patients who were diagnosed to have colorectal cancer (Group 1) and healthy controls who had colonoscopy for colorectal symptoms in the same study period (Group 2
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Mansoura University | Al Mansurah | Egypt |
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| ID | Term |
|---|---|
| D015179 | Colorectal Neoplasms |
| ID | Term |
|---|---|
| D007414 | Intestinal Neoplasms |
| D005770 | Gastrointestinal Neoplasms |
| D004067 | Digestive System Neoplasms |
| D009371 | Neoplasms by Site |
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| Strains: OF E COLI | The specimens were immediately transferred to the lab, inoculated in nutrient broth and vortexed for a few seconds then incubated overnight. The following day the broth culture was subcultured on enteric isolation media. Identification of E. coli was carried out by using standard biochemical methods. | 1 week |
| D009369 | Neoplasms |
| D004066 | Digestive System Diseases |
| D005767 | Gastrointestinal Diseases |
| D003108 | Colonic Diseases |
| D007410 | Intestinal Diseases |
| D012002 | Rectal Diseases |