Personalized Multi-peptide Vaccination in CLL Patients

Peptide vaccination will take place in CLL patients that achieved at least a partial remission with detectable MRD after at least 6 and less than 9 months of an ibrutinib-based treatment regime. MRD will be determined by flow cytometry. MRD positivity is defined as \> 10-4 CLL cells in peripheral blood or bone marrow. Patients will receive either ibrutinib monotherapy or combinational therapy before study treatment. Vaccination will be done under ibrutinib monotherapy (i.e. after the end of e.g. anti-CD20 treatment, if applicable).