FLS leads to high survival rates and low neurological morbidity for fetuses in TTTS. FLS is an effective therapeutic option for TTTS before 26 weeks of gestation. Preoperative Doppler findings of the umbilical artery and the ductus venosus are useful in predicting prognosis following FLS.
In utero hematopoietic stem cell transplantation (IUHSCTx) can achieve mixed hematopoietic chimerism and donorspecific tolerance without cytoreductive conditioning or immunosuppression. The primary limitation to the clinical application of IUHSCTx has been minimal donor cell engraftment, well below therapeutic levels for most target diseases. Donor lymphocyte infusion (DLI) has been used in postnatal circumstances of mixed chimerism as targeted immunotherapy to achieve a graft-versus-hematopoietic effect and to increase levels of donor cell engraftment. In this report we demonstrate in the murine model that a combined approach of IUHSCTx followed by postnatal DLI can convert low-level, mixed hematopoietic chimerism to complete donor chimerism across full major histocompatibility complex barriers with minimal risk for graftversus-host disease (GVHD) .
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