Bagnara D, Mazzarello AN, Cardente N, Vergani S, Kasar S, Fernandes S, Ferrer G, Ghiotto F, Barrientos JC, Kolitz JE, Rai KR, Alen SL, Colombo M, Fais F, Brown JR, Ferrarini M, Chiorazzi N. Chronic lymphocytic leukemia often arises by a multiclonal selection process. Haematologica; https://doi.org/10.3324/haematol.2024.286380 [Early view].