NDN and neoplasm: One haplotype of three single nucleotide polymorphisms (SNPs) (rs1722793 - rs1524843 - rs1781208 GAG), which is located approximately 17 kb downstream of NDN and has a frequency of 0.347 in the study population, was significantly associated with the tumor expression level of NDN (P = 0.001; FDR = 0.048; Figure 1A).