A dynamic prognostic model to predict survival in primary myelofibrosis: a study by the IWG-MRT (International Working Group for Myeloproliferative Neoplasms Research and Treatment).
Age older than 65 years, hemoglobin level lower than 100 g/L (10 g/dL), white blood cell count greater than 25 x 10(9)/L, peripheral blood blasts 1% or higher, and constitutional symptoms have been shown to predict poor survival in primary myelofibrosis (PMF) at diagnosis. To investigate whether the acquisition of these factors during follow-up predicts survival, we studied 525 PMF patients regularly followed. All 5 variables had a significant impact on survival when analyzed as time-dependent covariates in a multivariate Cox proportional hazard model and were included in 2 separate models, 1 for all patients (Dynamic International Prognostic Scoring System [DIPSS]) and 1 for patients younger than 65 years (age-adjusted DIPSS). Risk factors were assigned score values based on hazard ratios (HRs). Risk categories were low, intermediate-1, intermediate-2, and high in both models. Survival was estimated by the HR. When shifting to the next risk category, the HR was 4.13 for low risk, 4.61 for intermediate-1, and 2.54 for intermediate-2 according to DIPSS; 3.97 for low risk, 2.84 for intermediate-1, and 1.81 for intermediate-2 according to the age-adjusted DIPSS. The novelty of these models is the prognostic assessment of patients with PMF anytime during their clinical course, which may be useful for treatment decision-making.
Passamonti
Francesco
F
Department of Hematology Oncology, University of Pavia & Fondazione, Istituto Di Ricovero e Cura a Carattere Scientifico, Policlinico San Matteo, Pavia, Italy. f.passamonti@smatteo.pv.it
Cervantes
Francisco
F
Vannucchi
Alessandro Maria
AM
Morra
Enrica
E
Rumi
Elisa
E
Pereira
Arturo
A
Guglielmelli
Paola
P
Pungolino
Ester
E
Caramella
Marianna
M
Maffioli
Margherita
M
Pascutto
Cristiana
C
Lazzarino
Mario
M
Cazzola
Mario
M
Tefferi
Ayalew
A
D000367:Age Factors; D000368:Aged; D005260:Female; D006454:Hemoglobins / Q000378:metabolism; D006801:Humans; D007958:Leukocyte Count; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D015233:Models, Statistical; D055728:Primary Myelofibrosis / Q000097:blood / Q000401:mortality* / Q000628:therapy; D011379:Prognosis; D016016:Proportional Hazards Models; D012307:Risk Factors
D006454:Hemoglobins