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Background In essential thrombocythemia (ET) patients, history of thrombosis and age over 60 y are validated risk factors for occurrence of thrombosis during the follow-up. Leukocytosis, JAK2 V617F mutation, cardiovascular (CV) general risk factors, and male gender are candidate risk factors for thrombosis. The thrombocytosis, a constitutive abnormality in ET, is associated with both thrombotic and hemorrhagic complications. Aim To evaluate in a large cohort of ET patients the potential relationship between the thrombosis history and the main clinical and biological characteristics at diagnosis, i.e. before any interference of cytoreductive treatment. Methods A cohort of ET patients (PVSG or WHO criteria) of the Registro Italiano Trombocitemie (RIT) was retrospectively analyzed through logistic regression models. Results A total of 977 patients, 387 males and 590 females, presented at diagnosis: median age 56 y (43% with age >60 y), median PLT count 783 x 109/L (33% with low thrombocytosis, 10 x 109/L), median HCT 42.6% (high HCT: >47% in 24% of the males and >44% in 23% of the females), CV general risk factors in 69% of cases (one of smoking, hypercholesterolemia, hypertriglyceridemia, hypertension, diabetes, obesity, CV disease, familiarity for thrombosis), bone marrow fibrosis grade 0 in 67% of cases, JAK2 V617F mutation in 56% of the 399 tested patients. The history of thrombosis (arterial in 74% of cases) was reported in 194 (19.9%) patients. The history of thrombosis in univariate analysis was significantly related to: age >60 y (p 0.001), male gender (p 0.009), CV general risk factors (p 0.002), low thrombocytosis (p 0.000), leukocytosis (p 0.003), high HCT (p 0.004), and JAK2 V617F mutation (p 0.008). No relationship was found with bone marrow fibrosis. In multivariate analysis a relationship was confirmed between thrombosis history and age >60 y (p 0.023), male gender (0.046), CV general risk factors (0.039), low thrombocytosis (p 0.004), leukocytosis (0.019), and JAK2 V617F mutation (p 0.033). The rate of thrombosis history in the patients without both low thrombocytosis and leukocytosis (11%, 49/428) resulted significantly lower (p 0.0001) than in the patients with leukocytosis (24%, 54/224), the patients with low thrombocytosis (27%, 71/266), and the patients with both low thrombocytosis and leukocytosis (34%, 20/59). Conclusion In this cohort of ET patients the rate of thrombosis history in multivariate analysis is significantly related to various clinical and biological characteristics at diagnosis, including low thrombocytosis (PLT 10 x 109/L), JAK2 V617F mutation, age >60 y, male gender, and CV general risk factors. Acknowledgment this study was partially supported by the GIMEMA Foundation (Promotor of the RIT) and by the AIL Foundation. Disclosures: Gugliotta: SHIRE Company: Honoraria, Membership on an entity’s Board of Directors or advisory committees.

Background: the Registro Italiano Trombocitemia, that is a GIMEMA project, has been activated to registry Italian Essential Thrombocythemia (ET) patients, to improve the diagnosis appropriateness (WHO criteria), to verify the prognostic value of the clinical and biological parameters, to evaluate the compliance to the therapeutical Italian guidelines (1), and to create a network for activation of new studies. Objective: this analysis is mainly devoted to describe the ET patients registered in the RIT and to evaluate the therapeutic approach adopted in the 102 participating hematological centers. Material and methods: two thousand and fifteen ET patients have been registered after the written informed consent was obtained, and data validation by various expert panels is in progress. This preliminary report considers 1785 patients, diagnosed mainly (1078, 60.4%) since the publication in the year 2004 of the ET therapy Italian guidelines (1). Results: the patients, 678 (38%) males and 1107 (62%) females, showed at diagnosis: age 60.3 ± 16.8 years with higher values in males than in females (61.7 ± 15.3 vs. 59.4 ± 17.7, p Conclusion: in the analyzed patients of the ET Italian registry the diagnosis appropriateness resulted improved in the cases observed since the year 2004 respect those observed before, with an increase of bone marrow biopsies from 51% to 68% of patients. Moreover, in accord with the ET therapy Italian guidelines, the use of the cytoreductive drugs was less frequent in the patients diagnosed since the year 2004 than before (particularly for BUS, IFN, and ANA) and the more safe molecules IFN and ANA were preferentially deserved to the younger patients.

Epidemiological, diagnostic, prognostic and therapeutical data were retrospectively obtained by the Italian Registry in over 2000 Essential Thrombocythemia (ET) patients who mainly were diagnosed according to the PVSG criteria and were treated with potentially leukemogenic drugs. The Registro Italiano Trombocitemie (RIT), that is a GIMEMA project, has been activated in order to registry italian ET patients, to improve the diagnosis appropriateness (WHO criteria), to promote the acquisition of biological data, to evaluate the compliance to the therapeutical guidelines of the Italian Society of Hematology (SIE), to monitor in particular the ET patients receiving Interferons alpha and Anagrelide, to evaluate cases of pregnancy, pediatric age and familiarity, to define the prognostic value of the biological factors as JAK2 mutation, clonality, etc, to create a network for activation of new clinical and biological studies. The RIT, co-ordinated by the Hematology Unit of Reggio Emilia, is a web based registry that beside a public area comprehends a database of italian ET patients. The data, with respect of the privacy rules, are object of validation and analysis by various RIT expert subcommittees. Eighty hematological Institutions adhered to the RIT and 801 patients have been registered since June 2005. The ET diagnosis was done according to the PVSG (90%) and WHO (10%) criteria. The patients, 492 females and 309 males, had age 70 yr (30%), and the median age was 59 years. At diagnosis the platelet count was >1000 ×109/L in 29% of cases (mean 932). Few patients had prior thrombosis (4%; major 2%) and prior hemorrhage (2.6%). Patients at high risk of thrombosis were 55% on considering age >60 yr and/or previous thrombosis and/or PLT count >1500 ×109/L, and 65% on considering the PLT count cut-off of 1000 ×109/L. The patients shown general thrombotic risk factors (70%), disease related symptoms (40%) and splenomegaly (25%). By applying the WHO diagnostic criteria, the picture of true ET was found in 27% of cases. Sixty pregnancies have been reported. Aspirin was administered in 72% of patients and cytoreduction was performed in 62% of them, with use of Hydroxyurea (65%), Anagrelide (10%), Interferons alpha (10%), Pipobroman (4%), Busulfan (2%). A separate analysis for patients treated with Anagrelide and Iterferons alpha is in progress. To improve the diagnostic approach, the RIT has promoted the bone marrow biopsy revision (WHO criteria) and the acquisition of the new biological parameters.