ATM and B-cell chronic lymphocytic leukemia: Recruitment was limited to five patients bythe funding available for this pilot study.The CLL-FISH panel revealed 11q23 (consistent with ATM gene deletion)and trisomy 12 abnormalities in 2 patients; in both cases, trisomy 12 was alsorevealed using conventional cytogenetics, with additional rearrangement ofchromosome 13 in one patient and multiple structural abnormalities in the other(Table 1).