In particular, HLA-DR/DP/DQ, CD40, CD41b, CD42a, and CD62P expression was significantly higher in EVs from decidua samples of women with MS compared to HC (Mann–Whitney U test, p = 0.04, p = 0.03, p = 0.049, p = 0.01 and p = 0.04, respectively), while CD133 level was higher in EVs from trophoblast samples of women with MS compared to HC (Mann–Whitney U test, p = 0.04). Here, CD40 is linked to myeloid sarcoma.