The clinical significance of low-frequency deletions of 17p13 [tumour protein p53 (TP53)] in patients with chronic lymphocytic leukaemia (CLL) is currently unclear. Low-frequency del17p clones (<25%) were identified in 15/95 patients in the Australasian Leukaemia and Lymphoma Group (ALLG)/CLL Australian Research Consortium (CLLARC) CLL5 trial. Patients with low del17p, without tumour protein p53 (TP53) mutation, had significantly longer progression-free survival and overall survival durations than patients with high del17p clones. In 11/15 cases with low-frequency del17p, subclones solely with del17p or del13q were also noted. These data suggest that low-frequency del17p does not necessarily confer a poor outcome in CLL and challenges the notion of del13q as a founding event in CLL.
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