Table 1.

Frequency of NQO1 and NQO2 Polymorphisms in Nodular Hyperplasia and Papillary Thyroid Microcarcinoma

NQO1, NAD(P)H:Quinone Oxidoreductase 1; NQO2, NRH:Quinone Oxidoreductase 2; NH, nodular hyperplasia; PTMC, papillary thyroid microcarcinoma. C/C: wild type NQO1. C/T: heterozygote C609T missense variant of NQO1. I29: 29 basepair insertion polymorphism of NQO2. D: 29 basepair deletion polymorphism of NQO2.

^*The NQO1 polymorphisms of 25 cases of 73 NH and 45 cases of 170 PTMC were not able to be assessed.

^†Two cases of PTMC showing the I29/I16 genotype were not included.

^‡Pair-wise comparisons from the Pearson χ² test.

^§Comparisons of three or four groups using linear by linear association.