The subgroup of APS, obstetric antiphospholipid syndrome (OAPS), is defined as persistent positivity for aPL and early recurrent pregnancy loss, early fetal death, stillbirth, or preterm delivery in the first 34 weeks of gestation due to preeclampsia, eclampsia, and placental insufficiency (61). This evidence concerns the gene FASLG and antiphospholipid syndrome.