HLA-C and preeclampsia: Expression of human leukocyte antigen C (HLA-C) on EVTs, interacting with killer cell immunoglobulin-like (KIR) receptors on uNK cells, could play a role in pregnancy outcome as certain combinations of fetal HLA-C and maternal KIR alleles might increase the risk of developing preeclampsia and recurrent miscarriage (31, 32).