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Further observations on LKB1/STK11 status and cancer risk in Peutz-Jeghers syndrome
1Section of Cancer Genetics, Institute of Cancer Research, Sutton, Surrey SM2 5NG, UK. wlim@icr.ac.uk
Insights
Peutz-Jeghers syndrome (PJS) is linked to LKB1/STK11 gene mutations, significantly increasing cancer risk in carriers. Further research is needed for LKB1/STK11-negative cases due to their likely heterogeneity.
Area of Science:
- Oncology
- Genetics
- Gastroenterology
Background:
- Peutz-Jeghers syndrome (PJS) is a rare dominant disorder caused by germline mutations in the LKB1/STK11 tumor suppressor gene.
- PJS presents with gastrointestinal hamartomatous polyps, perioral pigmentation, and an elevated risk of various cancers.
- Limited follow-up data and genetic heterogeneity complicate PJS management and genetic counseling.
Purpose of the Study:
- To analyze the LKB1/STK11 locus in PJS families.
- To estimate cancer risks for carriers and non-carriers of LKB1/STK11 mutations.
- To investigate the genetic basis and cancer risks associated with Peutz-Jeghers syndrome.
Main Methods:
- Analysis of the LKB1/STK11 locus in 33 PJS families.
- Identification of germline mutations in the LKB1/STK11 gene.
- Estimation of cancer risks in carriers and non-carriers.
Main Results:
- Germline LKB1/STK11 mutations were found in 52% of PJS cases, supporting the possibility of a second PJS locus.
- Cancer risk was markedly elevated in carriers of LKB1/STK11 mutations.
- By age 65, carriers had a 47% risk of any cancer, with increased risks for gastrointestinal and breast cancers.
Conclusions:
- PJS associated with LKB1/STK11 mutations confers a high risk of multiple gastrointestinal and non-gastrointestinal cancers.
- The findings highlight the critical role of LKB1/STK11 in PJS pathogenesis and cancer risk.
- Further genotype-phenotype studies, particularly for LKB1/STK11-negative cases, are essential for precise risk assessment and management.
Abstract:
Germline mutations in the LKB1/STK11 tumour suppressor gene cause Peutz-Jeghers syndrome (PJS), a rare dominant disorder. In addition to typical hamartomatous gastrointestinal polyps and pigmented perioral lesions, PJS is associated with an increased risk of tumours at multiple sites. Follow-up information on carriers is limited and genetic heterogeneity makes counselling and management in PJS difficult. Here we report the analysis of the LKB1/STK11 locus in a series of 33 PJS families, and estimation of cancer risks in carriers and noncarriers. Germline mutations of LKB1/STK11 were identified in 52% of cases. This observation reinforces the hypothesis of a second PJS locus. In carriers of LKB1/STK11 mutations, the risk of cancer was markedly elevated. The risk of developing any cancer in carriers by age 65 years was 47% (95% CI: 27-73%) with elevated risks of both gastrointestinal and breast cancer. PJS with germline mutations in LKB1/STK11 are at a very high relative and absolute risk of multiple gastrointestinal and nongastrointestinal cancers. To obtain precise estimates of risk associated with PJS requires further studies of genotype-phenotype especially with respect to LKB1/STK11 negative cases, as this group is likely to be heterogeneous.
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