We are happy to welcome you to the 8th Congress on Controversies in Stem Cell Transplantation and Cellular Therapies (COSTEM), which will take place October 19-21, 2023 in Berlin, Germany and online.   COSTEM recently moved to become an annual event as we felt the need to build a platform for our community to interact with each other and to share our scientific research, clinical experience, and on-going developments in our field. COSTEM encourages active participation in debate discussions and challenges global experts to promote their positions on a wide range of current issues – providing clinicians the opportunity to share, express and compare experiences with the goal being to establish and advance effective and reliable patient treatments.   The 8th COSTEM Congress will continue to serve as a unique platform with a program that showcases the most compelling and controversial topics facing clinicians in our field in an exciting debate forum.