SLC22A4 and abscess: Some years later, the occurrence of four OCTN1 promoter variants, rs3761661, rs3761660, rs162887, and rs460271, in patients with CD and in controls were examined, and it was concluded that some OCTN1 functional promoter haplotypes could affect the clinical phenotype of CD in Koreans, represented by a predisposing factor for the development of penetrating behavior characterized by intestinal perforation, inflammatory mass, and/or abscess [38].