Chronic Lymphocytic Leukemia Patients With Deletion 11q Have a Short Time to Requirement of First-Line Therapy, But Long Overall Survival: Results of a Population-Based Cohort in British Columbia, Canada

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Micro-AbstractThis study documents the clinical course of 69 patients with high-risk chronic lymphocytic leukemia (CLL) with 11q22.3 deletion (11q-), from a provincial CLL database. Aklylator-containing chemotherapies are thought to be required to overcome the adverse prognosis associated with 11q-. However, most 11q- patients did not receive alkylators first-line and had a median survival of 14.7 years, comparable with the rest of the cohort.Background:Chronic lymphocytic leukemia (CLL) patients with 11q22.3 deletion (11q-) have an aggressive clinical course, and thus selection of first-line therapy in this group is important. This study aimed to improve our understanding of real-world practice patterns and outcomes of CLL patients with 11q- in a population-based setting.Patients and Methods:The British Columbia CLL Database was used to identify patients with 11q-. Overall survival (OS) and treatment-free survival (TFS) were assessed after adjustment for prognostic factors.Results:Of 1044 patients in the database, 125 had 11q- (12%). Sixty-nine patients had 11q- identified before therapy initiation and had a median OS and TFS of 14.7 (95% confidence interval [CI], 11.3-18.1) and 2.5 (95% CI, 1.5-3.6) years. Patient with copresence of 11q- and deletion 17p had a markedly worse prognosis, with median OS of 4.9 versus 14.7 years (P < .001). Most treated patients (33 of 52) received fludarabine with or without rituximab (FR). Patients treated with FR had a median OS of 12.8 years (standard error, 1.0), which was not statistically different from those treated with alkylator-containing therapy (P = .35).Conclusion:Although median TFS of 11q- patients in this cohort was short at 2.5 years, OS remains long at 14.7 years, even when most patients received initial treatment without alkylators.

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