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Article Abstract
Background: Splicing factor 3b subunit 1 (SF3B1) mutations have been implicated in hematologic malignancies, but the clinical significance of distinct SF3B1 mutation variants remain unclear.
Methods: The objective of this study was to evaluate clinicopathologic features, mutational profiles, and outcomes of 1691 patients with hematologic malignancies, including myelodysplastic syndromes (MDS; n = 402), acute myeloid leukemia (AML; n = 758), and chronic lymphocytic leukemia (CLL; n = 531).
Results: The frequency of SF3B1-mutated (SF3B1) MDS, AML, and CLL was 70 of 402 patients (17.4%), 23 of 758 patients (3.0%), and 45 of 531 patients (8.5%), respectively. p.K700E was the most prevalent SF3B1 variant and was identified in 43 of 70 of patients with MDS (61.4%), in seven of 23 patients with AML (30.4%), and in 19 of 45 patients with CLL (42.2%). In MDS and AML, TET2 was the most frequent co-mutated gene in patients with SF3B1 disease (20 of 70 patients with MDS [28.6%]; 11 of 23 patients with AML [47.8%]). For patients with SF3B1 CLL, the most common co-mutated genes were ATM (11 of 45; 24.4%) and TP53 (11 of 45; 24.4%). Kaplan-Meier analysis indicated that the SF3B1 p.K700E variant was significantly associated with improved overall survival (OS) and progression-free survival (PFS) in patients who had MDS (p < .001 and p = .016, respectively) but with worse OS and PFS in those who had AML (p = .006 and p = .006, respectively) compared with those who had wild-type SF3B1. In patients who had CLL, p.I704F was associated with reduced OS (p < .001) and p.K700E was associated with a shorter time-to-first treatment (p = .028) compared with those who had wild-type SF3B1. Multivariable analysis identified p.K700E as an independent protective factor for OS in patients with MDS (p = .048) but as an independent risk factor for both OS and PFS in patients with AML (p = .036 and p = .035, respectively) and for the time to first treatment in patients with CLL (p = .033).
Conclusions: Specific SF3B1 variants should be incorporated into prognostic stratification for hematologic malignancies.
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