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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
medicine
Lynch syndrome in Tunisia: First description of clinical features and germline mutations
International Journal of Colorectal Disease, Volume 26, No. 4, Year 2011
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Description
Purpose High rates of early colorectal cancers (CRC) are observed in Tunisia suggesting genetic susceptibility. Nevertheless, up to now, no molecular study has been performed in the Tunisian population. In our research, we evaluated the clinical characteristics of Tunisian families suspected of Lynch syndrome and the contribution of DNA mismatch repair (MMR) genes. Methods Thirty-one unrelated families suspected of Lynch syndrome were studied. Probands were tested for the presence of germline mutations in the MMR genes MLH1, MSH2, MSH6 and in MUTYH. Available tumours were analysed for microsatellite instability and expression of MMR proteins. Detailed family and medical histories were collected. Results A total of 134 cancers were noted in the 31 families, the most frequent type of cancer corresponding to CRC (69%), followed by uterine cancer (7.5%). Germline mutations were identified in 11 (35.5%) families (six MSH2, five MLH1, including seven novel mutations), seven of which fulfilled the Amsterdam criteria (sensitivity, 63.6%; positive predictive value, 58.3%). Noteworthy, germline mutations were detected in 52.6% of male patients tested, but in only 8.3% of females (p=0.02). Moreover, CRC were essentially left sided in families without detected mutation (p=0.017). Ages of onset of cancers and tumour spectrum were very similar in families with or without MMR germline mutation, contrasting with previous studies performed in other populations. Conclusions MMR genes contribute significantly to CRC susceptibility in the Tunisian population. However, the cause of early CRC susceptibility remains unknown in most cases, especially in women and in patients with early left colon or rectal cancer. © Springer-Verlag 2011.
Authors & Co-Authors
Moussa, Sana Aissi Ben
Unknown Affiliation
Moussa, Amel
Unknown Affiliation
Kourda, Nadia
Unknown Affiliation
Mézlini, Amel
Unknown Affiliation
Abdelli, Nabil
Unknown Affiliation
Zérimech, Farid
Unknown Affiliation
Najjar, Taoufik
Unknown Affiliation
Jilani, Sarrah Ben
Unknown Affiliation
Porchet, Nicole
Unknown Affiliation
Ben-Ayed, Farhat
Unknown Affiliation
Manaï, Mohamed
Unknown Affiliation
Buisine, Marie Pierre
Unknown Affiliation
Statistics
Citations: 12
Authors: 12
Affiliations: 7
Identifiers
Doi:
10.1007/s00384-010-1129-9
ISSN:
01791958
e-ISSN:
14321262
Research Areas
Cancer
Genetics And Genomics
Study Design
Cross Sectional Study
Study Locations
Tunisia
Participants Gender
Male
Female