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Three immunotherapeutic approaches have been tested in recurrent miscarriage (RM): prednisone, active immunization with allogeneic lymphocytes from the partner or third-party donors, and intravenous immunoglobulin (IvIg). The thought that allogeneic leukocyte immunization therapy (ALT) could be beneficial in RM arose from the observation that injections of paternal lymphocytes into pregnant female mice in crosses of strains with a high fetal resorption rate could decrease the resorption rate. The placebo-controlled trial (PCTs) included in the Cochrane meta-analysis of ALT were very heterogeneous with respect to the frequency of secondary RM patients. Intravenous immunoglobulin (IvIg) is prepared by extracting the IgG fraction from plasma from normal blood donors. More PCTs in the potential main target group with primary RM should be undertaken to get better documentation for the benefit and more information about the optimal doses and methods of administration and about harm effects.