What is the appropriate screening protocol in Lynch syndrome?
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Lynch syndrome families have a substantial risk of developing colorectal cancer (CRC). The recommended surveillance protocol includes colonoscopy every 2 years from age 20–25 years. It is yet unknown whether annual screening of patients aged 40–60 years is more effective than bi-annual screening, whether patients who had an adenoma removed should be re-examined after a year and whether surveillance of second-degree relatives is indicated. The aim of this study was to address these issues.
All carriers of a mismatch repair gene mutation who participated in the surveillance program were selected from the Dutch Lynch syndrome registry. The results of colonoscopy were prospectively collected.
A total of 666 mutation carriers were identified in 110 families. Fourty-one CRCs were detected during endoscopic follow-up, of which 34 (83%) were diagnosed between age 40 and 60 years. In five of 34 patients, CRC was diagnosed within 1 year after colonoscopy, eight cancers were diagnosed between 1 and 2 years and the remaining tumors more than 2 years after colonoscopy. All eight CRCs detected between 1 and 2 years were at local stage.
At least one adenoma was diagnosed at 141 examinations. The risk of developing CRC during follow-up in carriers with an adenoma was similar as in carriers without an adenoma at the previous colonoscopy. 280 parent–child couples with at least one Lynch syndrome-related carcinoma were identified in 110 families. In only 19 (6.8%) of these couples, CRC developed earlier in the child than an Lynch syndrome-associated cancer in the parent.
The current surveillance protocol, i.e., bi-annual colonoscopy in first-degree relatives independent of age and endoscopic findings, appears to be appropriate.
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- What is the appropriate screening protocol in Lynch syndrome?
Volume 5, Issue 4 , pp 373-378
- Cover Date
- Print ISSN
- Online ISSN
- Kluwer Academic Publishers
- Additional Links
- Colorectal Cancer
- Lynch syndrome
- Surveillance protocol
- Industry Sectors
- Author Affiliations
- 1. The Netherlands Foundation for the Detection of Hereditary Tumours, Leiden University Medical Center, Poortgebouw Zuid, 2333 AA, Leiden, The Netherlands
- 2. Department of Gastroenterology, Leiden University Medical Center, Leiden, The Netherlands
- 3. University Medical Center Nijmegen, Nijmegen, The Netherlands
- 4. University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
- 5. Hospital Slingeland Doetinchem, Doetinchem, The Netherlands
- 6. Maxima Medical Center Eindhoven, Eindhoven, The Netherlands
- 7. The Netherlands Cancer Institute, Amsterdam, The Netherlands