Flaws in three genes could help explain why parts of southern China have extraordinarily high rates of a type of nose-and-throat cancer.
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Experts from China, Singapore and the United States trawled through a genetic datamine of about 10,000 people of southern Chinese descent.
Half of the volunteers had been diagnosed with nasopharyngeal carcinoma, a cancer that forms in the lining of the upper throat lying behind the nose.
The other half were otherwise healthy.
What showed up in the cancer group were telltale variants in three genes, according to the research, which has been reported in the journal Nature Genetics.
The three, named TNFRSF19, MDSIEVI1 and CDKN2A/2B, have been previously linked with leukaemia.
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