RecruitingStudy on the Diagnosis and Management of CLL in Italy by GIMEMAretrospective and prospective multicenter observational clinical and biological data collection from all patients with newly diagnosed CLL, SLL or MBL. retrospective cohort: all cases with a diagnosis between January 1st 2010 and August 31th 2021. prospective cohort: all patients with a diagnosis between September 1st 2021 and September 1st 2025.