Clinical trial · Observational
The GEOLynch Cohort Study
The GEOLynch Cohort Study: Genetic, Environmental and Other Factors That Influence Tumour Risk Among Persons With Lynch Syndrome
NCT03303833CI-TRIAL-00029796GEOLynchrecruitingClinicalTrials.gov clinicaltrialsProvenance
- Source
- ClinicalTrials.gov
- Retrieved
- Sep 8, 2026
- Layer
- normalized (units and labels harmonized; values unchanged)
- Run
- ING-CLINICALTRIALS-20260908-000001
Summary
Brief summary (as posted)
The GEOLynch cohort study has been established to investigate the influence of genetic, environmental and other factors on tumour risk in persons with Lynch syndrome.
Conditions
Conditions (4)
Free-text conditions as registered, with the CancerIndex entity they were reconciled to and the match type.
| Condition (as posted) | Mapped entity | Match | Confidence |
|---|---|---|---|
| Colorectal Neoplasms | Colorectal Neoplasm | ONTOLOGY_EXACT | 0.98 |
| Hereditary Nonpolyposis Colorectal Cancer | — | UNRESOLVED | — |
| Lynch Syndrome | — | UNRESOLVED | — |
| Neoplasms | Neoplasm | ONTOLOGY_EXACT | 0.90 |
Interventions
Interventions (1)
| Intervention | Type | Mapped drug | Match |
|---|---|---|---|
| No intervention, observational study. | Other | — | UNRESOLVED |
Design
Arms and outcomes
Arms (1)
- label
- Persons with Lynch syndrome
- interventionNames
- Other: No intervention, observational study.
Primary outcomes (3)
- measure
- Colorectal tumour diagnoses
- timeFrame
- Diagnoses before and after study inclusion will be assessed approximately every 2 years until study completion by regularly reviewing medical reports and/or pathology reports.
- description
- All diagnosed colorectal adenomas and carcinomas described in paticipants' medical reports and/or pathology reports.
- measure
- Endometrial cancer diagnoses
- timeFrame
- Diagnoses before and after study inclusion will be assessed approximately every 2 years until study completion by regularly reviewing medical reports and/or pathology reports.
- description
- All diagnosed endometrial cancers described in participants' medical reports and/or pathology reports.
Eligibility
Eligibility (as posted)
- Sex
- All
- Minimum age
- 18 Years
- Maximum age
- 80 Years
Show eligibility criteria text
Inclusion Criteria: * Persons with a known mutation in a gene that causes Lynch syndrome, i.e. with an inherited monoallelic pathogenic germline mutation in either the MLH1, MSH2, MSH6, PMS2 or EPCAM gene. * Aged between 18 and 80 years at inclusion. Exclusion Criteria: * Additional carrier of another hereditary colon cancer predisposition syndrome (e.g. FAP) * (Chronic) Inflammatory bowel disease * Non-Dutch speaking * Dementia or another mental condition that makes it impossible to fill out questionnaires * Terminally ill persons
References
Publications (6)
- BACKGROUNDvan Duijnhoven FJ, Botma A, Winkels R, Nagengast FM, Vasen HF, Kampman E. Do lifestyle factors influence colorectal cancer risk in Lynch syndrome? Fam Cancer. 2013 Jun;12(2):285-93. doi: 10.1007/s10689-013-9645-8. PMID 23657759
- RESULTJung AY, van Duijnhoven FJ, Nagengast FM, Botma A, Heine-Broring RC, Kleibeuker JH, Vasen HF, Harryvan JL, Winkels RM, Kampman E. Dietary B vitamin and methionine intake and MTHFR C677T genotype on risk of colorectal tumors in Lynch syndrome: the GEOLynch cohort study. Cancer Causes Control. 2014 Sep;25(9):1119-29. doi: 10.1007/s10552-014-0412-4. Epub 2014 Jun 12. PMID 24916333
- RESULTBotma A, Nagengast FM, Braem MG, Hendriks JC, Kleibeuker JH, Vasen HF, Kampman E. Body mass index increases risk of colorectal adenomas in men with Lynch syndrome: the GEOLynch cohort study. J Clin Oncol. 2010 Oct 1;28(28):4346-53. doi: 10.1200/JCO.2010.28.0453. Epub 2010 Aug 23. PMID 20733131
- RESULTWinkels RM, Botma A, Van Duijnhoven FJ, Nagengast FM, Kleibeuker JH, Vasen HF, Kampman E. Smoking increases the risk for colorectal adenomas in patients with Lynch syndrome. Gastroenterology. 2012 Feb;142(2):241-7. doi: 10.1053/j.gastro.2011.10.033. Epub 2011 Nov 4. PMID 22062356
- RESULTBotma A, Vasen HF, van Duijnhoven FJ, Kleibeuker JH, Nagengast FM, Kampman E. Dietary patterns and colorectal adenomas in Lynch syndrome: the GEOLynch cohort study. Cancer. 2013 Feb 1;119(3):512-21. doi: 10.1002/cncr.27726. Epub 2012 Dec 17. PMID 23254892
- RESULTHeine-Broring RC, Winkels RM, Botma A, van Duijnhoven FJ, Jung AY, Kleibeuker JH, Nagengast FM, Vasen HF, Kampman E. Dietary Supplement Use and Colorectal Adenoma Risk in Individuals with Lynch Syndrome: The GEOLynch Cohort Study. PLoS One. 2013 Jun 18;8(6):e66819. doi: 10.1371/journal.pone.0066819. Print 2013. PMID 23825568