Practical, safe, and effective hemostatic approach to orthopedic surgery using Extended Half‐Life factor IX in hemophilia B. By intraindividual comparison, we found a lower FIX consumption, number of infusions, and cost compared to plasma‐derived FIX.

Background:We have identified a synonymous F8 variation in a severe hemophilia A (HA) patient who developed inhibitors following factor VIII (FVIII) prophylaxis. The unreported c.6273 G > A variant targets the consensus splicing site of exon 21. Objectives:To determine the impact of c.6273 G > A nucleotide substitution on F8 splicing and its translated protein. Methods:Patient peripheral blood mononuclear cells were isolated and differentiated into monocyte-derived macrophages (MDMs). FVIII distribution in cell compartments was evaluated by immunofluorescence. The splicing of mutated exon 21 was assessed by exon trapping. Identified FVIII splicing variants were generated by site-directed mutagenesis, inserted into a lentiviral vector (LV) to transduce Chinese hamster ovary (CHO) cells, and inject into B6/129 HA-mice. FVIII activity was assessed by activated partial thromboplastin time, whereas anti-FVIII antibodies and FVIII antigen, by ELISA.Results: HA-MDMs demonstrated a predominant retention of FVIII around the endoplasmic reticulum. Exon trapping revealed the production of two isoforms: one retaining part of intron 21 and the other skipping exon 21. These variants, predicted to truncate FVIII in the C1 domain, were detected in the patient. CHO cells transduced with the two FVIII transcripts confirmed protein retention and absence of the C2 domain. HA mice injected with LV carrying FVIII mutants, partially recovered FVIII activity without the appearance of anti-FVIII antibodies.Conclusions: Herein, we demonstrate the aberrant impact of a FVIII synonymous mutation on its transcription, activity, and pathological outcomes. Our data underline the importance of increasing the knowledge regarding the functional consequences of F8 mutations and their link to inhibitor development and an effective replacement therapy. | 1051 FAMÀ et Al.

Our study provides some initial data on the potential benefits of the treatment with TPO-RAs that may allow splenectomy to be safely deferred for prolonged periods. More research is needed to evaluate the impact of the treatment with TPO-RAs prior to splenectomy.

Background The majority of myelodysplastic syndrome (MDS), primary myelofibrosis (MPN) and aplastic anemia (AA) patients during the course of the disease develops a symptomatic anemia requiring transfusions of packed red blood cells (PRBC), each of them containing approximately 200 mg of elementary iron. Because of the fact that human beings are unable to actively eliminate iron from the body, secondary emosiderosis yet becomes evident when body iron content is above 7-14 grams, an amount easily reached after receiving as few as 15-30 PRCB units.From a pathophysiologic point of view, long-term transfusion therapy is certainly the most important cause of iron overload (IOL) in these patients; nevertheless, others mechanism account for this phenomenon, and in particular the role of the ineffective erythropoiesis.Deferasirox (DSX) is the principal option currently available for iron chelation therapy in the management of IOL due to transfusion dependent anemia. DSX is also a potent NF-kB inhibitor, and this effect may explain in part the phenomenon of hematological improvements reported in different clinical trials and in case reports. Materials and Methods We analyzed 21 patients,16 male and 5 female, with transfusion dependent anemia and with a transfusional history of almost 10 packed PRBC, treated with DSX from 1 February 2013 to 1 February 2014. Median age was 80 years (65-88). 20 patients (95%) have almost a comorbidity, 7 of them (30%) have more than 3 comorbidities. Heart disease was the most common comorbidity. At baseline median creatinine clearance was 76 ml/min; in 12 patients was < 60ml/min but >40 ml/min, according to NCCN Guidelines. All patients (16 MDS, 3 MPN, 1 AA, 1 hemolytic anemia) were evaluated for IOL by serum ferritin (SF), while only 7 with RM T2*.Median SF at baseline was 1750 μg/L and median PRBC was 32.The starting dose of DSX was 10 mg/kg/day; the dosage should be adjusted up to 20–30 mg/kg/daily according to the transfusional regimen, SF and IOL, if tolerated. Objectives To observe safety, tolerability, and efficacy of iron chelation therapy with DSX in older patients with transfusion dependent anemia. Results The SF decreased of 50% and 66% after 3 and 6 months respectively. The SF was normalized (SF<500 μg/L) in 5 patients (24%) after six months. The IOL occurred also in patients with a short transfusional history, inferior to 10 packed red blood cells, and SF <1000 μg/L. That was more evident in MDS patients especially in RARS. The median dose tolerated of DSX was 20 mg/kg/daily.The drug related adverse events (AE) was evaluated by the Common Terminology Criteria for Adverse Events (CTCAE versione 4.02). The severe adverse events (SAE) occurred in 10%.The most Common AE were diarrhea, nausea, upper abdominal pain, serum creatinine increase and rash. Hematologic response according to IWG criteria 2006 with DSX were observed in 17% of patients and was more frequent in MPN than MDS, independently from IOL. Conclusion DSX has shown high efficacy in a variety of iron overloaded patients with different anemias. Appropriate patient selection and regular clinical multidisciplinary evaluation of comorbidity and concomitant therapy remains a critical components of successful ther­apy, combined with carefull monitoring for both adverse effects and clinical efficacy, in order to derive the most benefit from a carefully imple­mented chelation strategy.In our cohort improvement of erythropoiesis was marginal. This might be due to the very small patient group analyzed. Disclosures No relevant conflicts of interest to declare.

BACKGROUND Essential Thrombocythemia (ET) is a Philadelphia-negative chronic myeloproliferative neoplasm characterized by haemorrhagic and thrombotic complications. Haemorrhagic events and arterial and venous thrombosis, including microcirculation transient occlusions, are the major causes of morbidity in ET patients. The control of these events represents the goal of standard therapeutic approaches. MATERIALS AND METHODS We retrospectively analysed data about 107 ET patients who received diagnosis between January 1980 and June 2014. Median follow-up was 80 months,16 patients were lost during follow-up. The medium age at diagnosis was 60 years, with a prevalence of female (66 patients).We recorded adverse cardiovascular events at diagnosis and during follow-up, assessing whether cytoreductive ad antiplatelet therapy could reduce such events and improve quality of life. Finally, we evaluated the impact of additional cardiovascular risk factors. OBJECTIVES to observe incidence and kind of thrombotic events in patients affected by ET at diagnosis and during follow-up. RESULTS 30 patients (27.7%) had a history of thrombosis at diagnosis (8 transient cerebral ischemia, 7 myocardial infarction/unstable angina, among them 7 patients experienced a rethrombosis during follow-up. 16 patients (15%) developed a first thrombotic event, all patients were under cytoreductive treatment. 21 patients with a history of thrombosis had more than 60 years at diagnosis, 19 patients (63%) had at least one additional cardiovascular risk factor among arterial hypertension, dyslipidemia, diabetes, obesity, hyperuricemia and smoking. Median platelet count was 813000/mm3, leukocyte count greater was more than 10000/mm3 in half of patients. Evolution to acute leukemia/myelofibrosis occurred in 3 (2,7%) and 7 (6,5%) patients of total. CONCLUSIONS The occurrence of thrombotic events even in patients with good hematologic response of disease and during antiplatelet and cytoreductive therapy, indicates the presence of a residual risk of thrombosis. This risk is not yet fully clarified by retrospective studies published until now. Prospective studies will be useful to evaluate the role and the importance of comorbidity in these patients with long-prognosis, in order to optimize therapy, reduce cardiovascular events and improve quality of life Disclosures No relevant conflicts of interest to declare.