No abstract

Extramedullary hematopoiesis (EMH) results from the extension of hematopoietic tissue beyond the confines of the bones. Since the initiation of regular transfusion programs from an early age for all thalassemia major (ΤΜ) patients, EMH has not been considered a clinical issue anymore. The present study aims to record the prevalence of EMH in chronically transfused ΤΜ patients followed at our institution and to investigate possible risk factors associated with its occurrence. The project was designed as a retrospective, nonexperimental, descriptive, exploratory study. In total, the study enrolled 104 patients. EMH was revealed in 15/104 (14%) patients. The presence of intravening sequence (IVS)-I-6 was significantly related with the development of EMH (p < 0.05). No other demographic or biological factor studied was found to be related with the presence of EMH. The study stresses a profound incidence of asymptomatic EMH in a solid group of well-transfused ΤΜ patients. Given the high incidence of the IVS-I-6 allele in the Mediterranean and Middle Eastern region, high-quality, prospective, multicenter studies could confirm the association of EMH occurrence with the presence of the IVS-I-6 mutation and further evaluate the exact role of this mutation in the EMH process.

No abstract

We herein would like to report an interesting case of a patient who presented with anemia and thrombocytopenia combined with high serum Lactic Dehydrogenase where Thrombotic Thrombocytopenic Purpura was originally considered. As indicated a central venous catheter was inserted in his subclavian vein which led to mediastinal hematoma and finally intubation and Intensive Care Unit (ICU) hospitalization. After further examination patient was finally diagnosed with B12 deficiency in a setting of H hemoglobinopathy. There have been previous reports where pernicious anemia was originally diagnosed and treated as Thrombotic Thrombocytopenic Purpura but there has been none to our knowledge that was implicated with hemothorax and ICU hospitalization or correlated with thalassemia and we discuss the significance of accurate diagnosis in order to avoid adverse reactions and therapy implications.

Hemoglobinopathies constitute the most frequent monogenic disorders worldwide and thalassemias are the most frequent genetic disorders in Greece. Over a 5-year period (2002-2006), 1,375 couples were screened for hemoglobinopathies and counseled at our Thalassaemia Prevention Unit, Hippokration Hospital, Thessaloniki, Greece. In 148 cases (10.7%), both partners carried an abnormal hemoglobin (Hb) gene and genetic counseling was offered. One hundred out of 116 pregnancies were at-risk of giving birth to an offspring carrying either the homozygous or double heterozygous forms of the mutations under discussion. The remaining 16 pregnancies involved couples who were heterozygous for mutations that did not cause severe clinical disease, and were exempted from prenatal diagnosis. Twenty-six fetuses were found to be homozygotes or double heterozygotes for clinically significant mutations. These couples were informed of the danger of having an affected child but the termination or continuation of the pregnancy was left to the couples to decide. Nevertheless, all the couples preferred to terminate the pregnancies. The National Thalassaemia Prevention Programme has effectively decreased the incidence of thalassemia major and sickle cell syndromes in Greece.

No abstract

Angiogenesis seems to be a prominent event of myeloproliferative diseases. There are few reported data on angiogenesis and the significance of its stimulator, the vascular endothelial growth factor (VEGF), in polycythaemia vera (PV). We report our observation of elevated serum VEGF levels in patients suffering from PV. Twenty patients with PV and 20 age-matched healthy subjects were enrolled. VEGF levels were measured by a quantitative sandwich enzyme immunoassay. Serum VEGF levels in PV were found to be very significantly higher than in healthy individuals (569.7 ± 101.2 vs. 164.7 ± 32.8 pg/ml, p = 0.001). We found no correlation between VEGF and haemoglobin, platelet or leucocyte counts in the patient group. Different therapeutic regimens had no influence on VEGF levels. However, in the control group, we observed a positive correlation between VEGF levels and platelet counts (r = 0.52, p = 0.02). Platelet counts did not differ between patients and healthy subjects. We also evaluated platelet-poor plasma VEGF levels in 10 patients and in all healthy individuals. We found very low levels of VEGF, approximately zero in most cases, in both groups and there was obviously no difference between the two groups. Our results indicate that VEGF is overproduced in PV. However, follow-up studies are needed to verify the role of this factor.

Hemoglobin E-Saskatoon (beta22-Glu-Lys) is found worldwide but is extremely rarely. Two cases of pregnant women who carried the abnormal hemoglobin and the various problems that arise from it are reported. A discussion of the combinations with other abnormal hemoglobin is also presented.