Among the circulating placental factors present in the maternal circulation, the soluble truncated vascular endothelial growth factor (VEGF) receptor type 1 or tyrosine kinase-1 similar to fms (sFlt-1), has received increasing attention due to its clinical applicability as risk factor for preeclampsia (Maynard et al., 2003; Levine et al., 2004). Here, CSF1R is linked to preeclampsia.