This case study of the obligatory case manager function for cancer patients explores by whom and for what the function is used. It draws on quantitative data from a database, focus group interviews with case managers at Rigshospitalet and telephone interviews with patients and relatives. The conclusion is that across the different cancer forms patients are using the function unevenly. This can probably be explained by the varying organizational set-ups for patient trajectories across departments. The individual patients and relatives express satisfaction with the information and assistance received from the case managers.