Summary:We retrospectively reviewed the results of serial pulmonary function tests (PFT) after allogeneic bone marrow transplantation (BMT) performed in 80 children at a single institution over a 16-year period. We looked for associations linking PFT results to graft-versus-host disease (GVHD), conditioning regimen (total body irradiation (TBI) vs busulphan), and cytomegalovirus immune status. The median follow-up after BMT was 4 years. At 2 years after BMT, significant declines were found in forced vital capacity (FVC) and forced expiratory volume in 1 s (FEV1), as compared to baseline. Both FEV1 and the FEV1/FVC ratio showed significantly greater reductions in the group conditioned with busulphan (n Œ 22) than in the group conditioned with TBI (n Œ 49) and were significantly lower in the patients with (n Œ 16) than without (n Œ 64) chronic GVHD. Busulphan may be associated with greater long-term lung toxicity than TBI. The relevance of this finding to selection of conditioning regimens for BMT should be examined in the light of the overall pattern of side effects. Chronic GVHD was associated with airway obstruction. total body irradiation; busulphan; cytomegalovirus Bone marrow transplantation (BMT) has been used with increasing success in children with malignant and nonmalignant haematological diseases, which cannot be cured with conventional treatment. Major advances made in recent years have sharply increased the rate of long-term relapse-free survival after BMT in children. The corollary of this progress is a need for evaluation of the long-term effects of BMT on organ system function. Chronic pulmonary disease remains a major source of morbidity and mortality in children after BMT. [1][2][3][4][5] We reviewed serial pulmonary function tests (PFT) in children treated with allogeneic BMT at a single institution over a 16-year period. We examined the relationships linking graft-versushost disease (GVHD), conditioning regimen (total body irradiation (TBI) vs busulphan), and cytomegalovirus (CMV) immune status to the development of PFT abnormalities after BMT.
Patients and methods
Patient characteristicsWe retrospectively reviewed PFT data from children who underwent allogeneic BMT at the Debrousse Hospital between 1984 and 2000. A total of 80 children with at least PFT performed at a year after BMT were studied. The median follow-up was 4 years and minimum follow-up was 1 year. The main patient characteristics are shown in Table 1. Age at BMT, type of pretransplant conditioning regimen, CMV immune status of the recipient, and presence or absence of acute or chronic GVHD were recorded for statistical analyses. TBI consisted of two radiation sessions per day for 3 consecutive days, delivering 12 Gy in all. The lungs were shielded after 9 Gy. GVHD prophylaxis included cyclosporine plus methotrexate 15 mg/m 2 on day 1 after BMT and 10 mg/m 2 on days 3, 6, and 11. All the patients received cotrimoxazole for the first 12 months as Pneumocystis carinii prophylaxis. Whenever possible, PFT were obtained before BMT and...