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Constitutional Mismatch Repair-Deficiency Syndrome Is a Rare Cause of Cancer Even in a Highly Consanguineous Population

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DOI: 10.4236/jct.2013.45114    2,911 Downloads   4,630 Views   Citations


Biallelic germline mutations in the mismatch repair genes, including MLH1, MSH2, MSH6 or PMS2, lead to a recessive constitutional mismatch repair-deficiency (CMMR-D) syndrome characterized by early onset malignancies in children and young adults. Because consanguinity unmasks autosomal recessive disorders, we hypothesized that the frequency of CMMR-D is inflated in the highly consanguineous population of Saudi Arabia. In this study, 371 pediatric and young adult patient samples from Saudi Arabia that cover the tumor spectrum of CMMR-D syndrome were analyzed for biallelic germline mutations in the MLH1, MSH2, MSH6 and PMS2 with the use of direct genomic sequencing. However, none of the 371 patients involved in the study was found to have biallelic pathological mutations of MLH1, MSH2, MSH6 or PMS2. This result indicates that CMMR-D is exceptionally rare among pediatric cancer patients and adult early onset cancer patients, even in the highly consanguineous Saudi population. Our findings suggest that larger cohorts will be needed, particularly in outbred populations, to determine the frequency of CMMR-D and that routine screening for this syndrome among cancer patients is not warranted.

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The authors declare no conflicts of interest.

Cite this paper

R. Bu, A. Siraj, P. Bavi, A. Belgaumi, S. Uddin and F. Alkuraya, "Constitutional Mismatch Repair-Deficiency Syndrome Is a Rare Cause of Cancer Even in a Highly Consanguineous Population," Journal of Cancer Therapy, Vol. 4 No. 5, 2013, pp. 996-1004. doi: 10.4236/jct.2013.45114.


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