Determinants of Repeated Spontaneous Miscarriages and Unexplained Fetal Deaths

The DEFI-1 study recruited 625 women witnesses and 299 of their spouses. With regard to case couples, 271 cases were recruited from the spontaneous repeated miscarriages (SRM) subgroup (≥3 spontaneous miscarriage (SM) from trimester 1 of pregnancy) and 93 from the unexplained fetal death in utero (FDIU) subgroup from trimesters 2 and 3 of pregnancy. The main objective of the DEFI 2 study is to increase the number of case-pairs in these 2 particular subgroups to replicate the results of the genetic determinants highlighted from cases and controls with extreme phenotypes and obtain a sufficient number of women with FDIUs to identify specific determinants.