CLL-like MBL remains stable over time. Percentages of persistent or transient clones at follow-up analysis in CLL-like, atypical-CLL, and CD5⁻ MBL. At the first evaluation the mean clonal B-cell count of persistent CLL-like MBL was 50.6 cells/μL, whereas transient CLL-like clones had a mean value of 0.40 cells/μL.