The 11q14·1‐q23·2del Chr11q/ATM deletions present in patient FR4 have been reported in 30% of chronic lymphocytic leukaemia cases (Edelmann et al, 2012; Skowronska et al, 2012) and at a lower rate in ALL (Schwab et al, 2013). Here, ATM is linked to B-cell chronic lymphocytic leukemia.