The goal of this study is to gather a broader knowledge and information from routine clinical use on the performance and safety of white blood cell depletion procedures with the Spectra Optia® apheresis system.~In order to do so, retrospective data on white blood cell depletion procedures with the Spectra Optia® apheresis system done in routine use in 3 different centers will be collected and analyzed.
This study is a multicenter, retrospective data collection of routine clinical use with the Spectra Optia® apheresis system for white blood cell depletion.