In our case–control study we tested different genetic variants of KIR2DL4 (9A/10A alleles and three intronic positions near this poly-adenine fragment), LILRB1 (rs41308748 G>A) and HLA-G (−725 C>G>T, −716 T>G in the promoter region and a 14 base pair insertion/deletion in 3′UTR) in patients with spontaneous abortion and control women as well as in male partners of these two groups. Here, HLA-G is linked to abortion.