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Nasopharyngeal carcinoma (NPC) occurs with high frequency in Southeast Asian populations. The high prevalence and familial clustering of NPC in these populations suggest that genetic factors may contribute to the increased cancer risk by affecting susceptibility. The aim of the present study was to map chromosomal loci linked to susceptibility genes predisposing for NPC. We carried out a genome-wide scan by multipoint affected-only allele-sharing methods in 15 Chinese NPC families with two to six affected members per family. The families were from the Guangdong province in the south of China, where the highest risk of NPC is documented. These samples were genotyped using 800 microsatellite markers covering all autosomal chromosomes with an average marker distance of 5 cM. Using multipoint linkage analysis, four loci (2q, 5p, 12p, and 18p) showed LOD scores above 1.5. After genotyping additional markers in these four regions, only one locus on 5p13 showed an increased LOD of 2.1. In further haplotype analysis, affected individuals in six families shared three marker haplotypes between D5S674 and D5S418. In conclusion, a region on 5p13 may harbor a susceptibility gene for NPC.

A genome-wide scan suggests a susceptibility locus on 5p13 for nasopharyngeal carcinoma