A large Finnish case-control study examining the relationship between HMOX1 polymorphism and this entity in 760 patients and 791 controls, in which allele frequencies of (GT)n repeats are comparable to others, clarified an association between the long allele of (GT)n repeats and non-severe, late-onset preeclampsia, but not severe preeclampsia [47]. The gene discussed is HMOX1; the disease is preeclampsia.