Frequencies of mtDNA haplogroups in NPC cases and NC subjects from Chaoshan population.

Abbreviations: NPC, nasopharyngeal carcinoma; NC, normal control; CC, Chaoshan sample, which included NC in this study and the two reported Chaoshan populations [42], [43]; UD, undefined. The value of P<0.05 is shown in bold. aHaplogroups were nested, within the respective NPC or NC group, according to their phylogenetic positions in the global human mtDNA PhyloTree (www.phylotree.org; mtDNA tree Build 15, 30 Sep 2012) [38]. For example, M contains D and M* and their sub-haplogroups, and so does N which contains R* and N* and their sub-haplogrous. bAdjusted for age and gender.