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[Study on positive rate of blocking antibody in women with recurrent spontaneous abortion administered by route and frequency of paternal lymphocyte immunotherapy].

OBJECTIVE
To investigates factors affecting the positive rate of blocking antibody treated by paternal lymphocyte immunotherapy in patients with recurrent spontaneous abortion (RSA).


METHODS
From January 2008 to August 2012, 326 RSA cases undergoing treatment in Infertility Center of Qilu Hospital were studied retrospectively. Those patients were divided into 2 groups randomly: 260 cases in intradermal injection group were administered via bilateral forearm intradermal injections for immunotherapy once 21 days, then the blocking antibody was determined after 2 (23 cases) , 3(73 cases), 4 (74 cases) , 5(90 cases) times respectively, while in subcutaneous injection group, the 66 cases were administered via subcutaneous injection once 21 days, the blocking antibody measured after 3 times; In both cases, the blocking antibody was all determined 2 weeks later. The positive rate of blocking antibodies and the rate of successful pregnancy was recorded, and then followed up after the blocking antibody turning positive.


RESULTS
(1) Positive rate of blocking antibodies:the positive rate of blocking antibodies were 17% (4/23) , 58% (42/73), 72% (53/74) and 84% (76/90) in the 2, 3, 4, and 5 times of intradermal injection group, respectively (P < 0.05). In subcutaneous injection group, the positive rate of blocking antibodies was 38 % (25/66), which was significantly lower than that in group intradermal injection receiving 3 times immunotherapy (P < 0.05). (2) The rate of pregnancy:the 176 patients out of 200 patients were pregnant when antibody was positive after immunotherapy, with 71.6% (126/176) of patients gained successful pregnancy(the length of pregnancy more than 5 months).


CONCLUSIONS
The route and frequency of administration of immunotherapy could influence the positive rate of blocking antibody. The rate of successful pregnancy will be increased after blocking antibody turning positive.