The results of our study suggest that CIN was higher in pesticide-exposed individuals carrying the heterozygous GSTP1 Ile-Val genotype than in those with the other two genotypes (Ile-Ile and Val-Val), as well as in pesticide-exposed individuals carrying the heterozygous XRCC1 (exon 10) Arg-Gln genotype compared to the other two genotypes (Arg-Arg and Gln-Gln). The gene discussed is GSTP1; the disease is cervical squamous intraepithelial neoplasia.