A case-control study of bronchiolitis obliterans syndrome following allogeneic hematopoietic stem cell transplantation.

Bronchiolitis obliterans syndrome ( BOS) is a significant complication after allogeneic hematopoietic stem cell transplantation ( HSCT). However, the pathogenesis and risks for the development of BOS have remained unclear. Therefore, a case-control study was conducted to investigate the risk factors for the development of BOS, which included the largest number of BOS cases; 196 patients with BOS were identified and compared with 1960 control recipients. The following were identified as significantly higher risk factors for the development of BOS: female recipients ( OR 1.47, P = 0.019), ABO-mismatch HSCT (minor mismatch, OR 1.67, P = 0.015; major mismatch, OR 1.73, P = 0.012; bidirectional mismatch, OR 1.96, P = 0.018), busulfan+cyclophosphamide-based myeloablative conditioning ( OR 1.74, P = 0.016), and acute graft-versus-host disease ( GVHD) involving the skin ( OR 1.55, P = 0.011). On the other hand, the risk for the development of BOS was significantly lower in patients receiving cord blood transplantation ( OR 0.26, P = 0.0011). With respect to other target organs of chronic GVHD, ocular involvement was significantly associated with BOS ( OR 2.53, P < 0.001). Prospective studies are required to elucidate the risk factors for the development of BOS, and future investigations should focus on finding a prophylactic approach against BOS based on these findings. [ABSTRACT FROM AUTHOR]