Retraction to: Bone Marrow Transplantation (2005) 36, 193–198; doi:10.1038/sj.bmt.1705050; published online 13 June 2005

This paper reported in part on a study of optimal timing of second transplantation in patients with multiple myeloma (http://clinicaltrials.gov/show/NCT00207805). It is being retracted with the consent of all the authors. Errors in data collection and entry have compromised the accuracy of the report.