Five single-nucleotide polymorphisms (SNPs) within genes of the nucleotide excision repair (NER) pathway were evaluated for their association with PD: ERCC1 (rs11615), ERCC2 (rs13181), XPA (rs1800975), XPC (rs2228001), and XPF (rs1799801). The gene discussed is ERCC4; the disease is Parkinson disease.