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We report a rare case of ovarian function recovery and pregnancy after hormone-replacement therapy (HRT) in the acute myeloblastic leukemia (AML) patient in third complete remission received hematopoietic stem cell transplantation (HSCT) with busulphan-based conditioning regimen. Successful engraftment of the donor cells and full donor's chimerism was achieved without the signs of leukemia. One year after HSCT the patient received a course of HRT as a treatment of hypergonadotropic hypogonadism. After 12 months of HRT the recovery of ovarian function was confirmed. Eight years after the HSCT spontaneous pregnancy occurred; heartbeat of the fetus was registered on week 7. Three weeks later a nonsevere vaginal bleeding occurred and the ultrasound examination showed a nondeveloping pregnancy. Genetic examination of the abortion material showed a full triploid genotype (69 XXX). To our knowledge this is a first case of ovarian function restoration and spontaneous pregnancy in a AML patient after multiple courses of high-dose chemotherapy and busulphan-based myeloablative conditioning for HSCT.