Interestingly, with the help of FCM, FLT-1+ macrophages were found in the early decidua and a prominent reduction of FLT-1+ dMφs was observed in patients with spontaneous abortion when compared with normal pregnancy (16.65 ± 1.06% vs. 44.83 ± 1.47%) (Figure 1C). This evidence concerns the gene FLT1 and abortion.