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Some patients treated by transplantation of haemopoietic stem cells (peripheral blood or bone marrow) become permanently infertile, but others retain or recover fertility. We assessed the outcome of conception in women, and partners of men previously treated by autologous or allogeneic stem cell transplantation (SCT). We sent questionnaires to 229 centres of the European Group for Blood and Marrow Transplantation. We sought details about the original disease, transplant procedure, and outcome of conception for both male and female patients. 199 centres gave information relating to 19 412 allogeneic and 17 950 autologous transplant patients. 232 (0·6%) patients conceived after SCT. Crude annual birth rate for 4-month survivors of SCT was lower than the national average for England and Wales at 1·7 per 1000 patients. 312 conceptions were reported in 113 patients (74 allograft) and partners of 119 patients (93 allograft). Most pregnancies were uncomplicated and resulted in 271 livebirths. 28 (42%) of 67 allograft recipients had caesarean section compared with 16% in the normal population (difference=26% [95% CI 15–38]), 12 (20%) of 59 had preterm delivery compared with a normal rate of 6% (14% [4–24]), and 12 (23%) of 52 had low birthweight singleton offspring compared with a normal rate of 6% (17% [6–29]). Pregnancy after SCT is likely to have a successful outcome. Pregnancies in allograft patients who have received total body irradiation should be treated as high risk for maternal and fetal complications.

To determine the role of allogeneic, autologous and syngeneic hemopoietic stem cell transplantation (SCTx) as a treatment for severe autoimmune disease (AID) we performed a literature search employing Medline, Cancer Lit and abstract books for reports on transplants for blood disorders and a concomitant AID. All reviews, case reports and abstracts available between June 1977 and September 2001 were used and attempts made to update them by e-mail by the corresponding authors. Disease-free survival (DFS) after allogeneic SCTx for 23 patients with severe aplastic anemia was 78% at 16 years and survival in unmaintained remission of concomitant AID was 64% at 13 years. DFS after allogeneic SCTx for 24 patients with hematologic malignancies was 87% at 15 years and survival in unmaintained remission for concomitant AID was 70% at 11 years. DFS after autologous SCTx for 24 patients with hematologic malignancies was 48% at 6 years and survival in unmaintained remission for concomitant AID was 29% at 3 years. Among 30 patients given allogeneic SCTx 19 developed graft-versus-host disease (GVHD) and 11 did not. Upon clinically justified discontinuation of all immunosuppressive therapy, 3/11 patients without GVHD relapsed with their concomitant AID (freedom of AID-relapse 69% at 9 years), whereas none of 19 patients with GVHD did so (log rank: P = 0.0135). Freedom of AID-relapse was superior after allo SCTx compared to autologous SCTx (89% at 18 years vs 38% at 5 years; log rank: P = 0.0002). Our data suggest that a graft-versus-autoimmunity effect after allogeneic hemopoietic SCTx mediates elimination of autoimmunity.