FREQUENCY OF CHROMOSOME LESIONS IN CLL (comparison of CCA and FISH) AberrationCytogenetics (*)FISH (**) Clonal30-50%82% Normal50-70%18% del 13q14 single7-11%36-45% 12q trisomy13-19%11-14% del 11q22-23/ATM6-13%8-25% del 17p/p531-5%3-7% del 6q211%2% (*) % total abnormal (**) Dohner et al, 2001 EHA