Prognostic impact of RAS-pathway mutations in patients with myelofibrosis.

Abstract:

:RAS-pathway mutations are recurrent events in myeloid malignancies. However, there is limited data on the significance of RAS-pathway mutations in patients with myelofibrosis (MF). We analyzed next-generation sequencing data of 16 genes, including RAS-pathway genes, from 723 patients with primary and secondary MF across three international centers and evaluated their significance. N/KRAS variants were present in 6% of patients and were typically sub-clonal (median VAF = 20%) relative to other genes variants. RAS variants were associated with advanced MF features including leukocytosis (p = 0.02), high somatic mutation burden (p < 0.01) and the presence of established "molecular high-risk" (MHR) mutations. MF patients with N/KRAS mutations had shorter 3-year overall survival (OS) (34% vs 58%, p < 0.001) and higher incidence of acute myeloid leukemia at 3 years (18% vs 11%, p = 0.03). In a multivariate Cox model, RAS mutations were associated with decreased OS (HR 1.93, p < 0.001). We created a novel score to predict OS incorporating RAS mutations, and it predicted OS across training and validation cohorts. Patients with intermediate risk/high-risk DIPSS with RAS mutations who received ruxolitinib had a nonsignificant longer 2-year OS relative to those who did not receive ruxolitinib. These data demonstrate the importance of identifying RAS mutations in MF patients.

journal_name

Leukemia

journal_title

Leukemia

authors

Santos FPS,Getta B,Masarova L,Famulare C,Schulman J,Datoguia TS,Puga RD,Alves Paiva RM,Arcila ME,Hamerschlak N,Kantarjian HM,Levine RL,Campregher PV,Rampal RK,Verstovsek S

doi

10.1038/s41375-019-0603-9

subject

Has Abstract

pub_date

2020-03-01 00:00:00

pages

799-810

issue

3

eissn

0887-6924

issn

1476-5551

pii

10.1038/s41375-019-0603-9

journal_volume

34

pub_type

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