Evaluation of BRCA1 Large Genomic Rearrangements in Group of Egyptian Female Breast Cancer Patients Using MLPA.

INTRODUCTION: Breast cancer is one of the most widespread cancers affecting women all over the world. In Egypt, it is considered to be the first cause of malignancies among female. BRCA1 Large Genomic Rearrangements (LGRs) have been reported in hereditary breast families and occurs in considerable proportion of cases in various populations. OBJECTIVE AND METHODS: We investigated the incidence of BRCA1 LGRs in group of Egyptian females with breast cancer using Multiplex Ligation-dependent Probe Amplification (MLPA) assay. RESULTS: Thirty six female breast cancer patients were included in this study. There were no BRCA1 LGRs detected in the studied group of patients which does not coincide with other study that were done on a group of Egyptian female patients. DISCUSSION AND CONCLUSION: This variance may be due to the small number of the investigated patients in both studies, which is considered as a limitation. So, screening for LGRs of BRCA1 gene as well as other genes that may be involved in breast cancer such as BRCA2 and CHEK2 genes of a larger number of patients is recommended to get the actual prevalence of these gene in the Egyptian population to deliver a cost-effective primary approach for these patients.

Glutathione S-transferase gene polymorphism: Relation to cardiac iron overload in Egyptian patients with Beta Thalassemia Major.

OBJECTIVES: Estimating the prevalence of glutathione S-transferase gene polymorphism (GSTM1) null genotype among patients with beta thalassemia major (ß-TM) in relation to myocardial status assessed by tissue Doppler and cardiac siderosis assessed by cardiac magnetic resonance imaging (MRI) T2*. METHODS: Hundred patients with ß-TM and 100 healthy controls were enrolled. Complete blood count (CBC), mean serum ferritin and GSTM1 genotyping, echocardiography, tissue Doppler, and cardiac MRI T2* were done. RESULTS: Serum ferritin ranged from 1200 to 8000 ng/ml, and mean T2* value was 27.10 ± 11.20 ms. Of patients, 68 (68%) had no cardiac siderosis, while 24 (24%) with mild to moderate, and 8 (8%) with sever cardiac siderosis. T2* values were not correlated with serum ferritin (r = -0.09, P = 0.50). GSTM1 null genotype was prevalent in 46% of patients and 40% of controls (P = 0.69). Patients with null genotype had significantly shorter T2* (P = 0.001), higher left ventricular end-diastolic diameter (P = 0.002), and shorter ejection time (P = 0.005) with no significant relation to serum ferritin (P = 0.122). GSTM1 null genotype was the only predictor for cardiac iron overload (P = 0.002). DISCUSSION: Serum ferritin concentrations have been shown to correlate poorly with all stages of cardiac dysfunction. Low cardiac MRI T2* values occur in patients with ß-TM despite good chelation therapy, suggesting a possible role of genetic factors in cardiac siderosis. CONCLUSION: GSTM1 null genotype is significantly associated with cardiac iron overload independent of serum ferritin in Egyptian patients with ß-TM.

Bone mass and biochemical markers of bone turnover in children and adolescents with chronic immune thrombocytopenia: relation to corticosteroid therapy and vitamin D receptor gene polymorphisms.

Optional drug therapy in refractory chronic immune thrombocytopenia (ITP) includes standard oral, pulsed high-dose steroid therapy, intravenous gamma globulin, anti-D, and immunosuppressive therapy or thrombopoietin receptor agonists. This work aimed to study the bone mass in children and adolescents with chronic ITP in relation to biochemical markers of bone turnover, cumulative steroid therapy, and the possible modulating effect of vitamin D receptor (VDR) gene polymorphisms. Thirty-six children and adolescents with chronic ITP were recruited from the Hematology Clinic, Children's Hospital, Ain Shams University and the Hematology Clinic of the National Research Centre in Egypt and compared with 43 healthy age- and sex-matched controls. The total cumulative dose of steroids was calculated. Bone markers (serum osteocalcin (OC) and propeptide I precollagen (PICP) and urinary deoxypyridinoline (DPD) excretion), analysis of VDR gene distribution, and dual energy X-ray absorptiometry at lumbar and hip regions were performed for patients and controls. Compared to controls, chronic ITP patients had higher body mass index (BMI) and lower height for age standard deviation score (SDS). Chronic ITP patients had lower levels of OC and C-terminal propeptide of type I procollagen (PICP) and higher urinary DPD excretion, and bone mineral density (BMD) was significantly lower for both spine and hip z-score (<0.001). BMD was inversely correlated with urinary DPD excretion, age, BMI, and cumulative steroid dose. There was significant negative correlation between cumulative oral steroid dose and BMD (r = -0.4, P = 0.01 and r = -0.45, p = 0.001 for spine and hip z-scores, respectively), but the correlation was non-significant in relation to cumulative pulsed steroid therapy. FokI polymorphism was significantly related to BMD for both spine and hip z-score (p = 0.015 and p = 0.008, respectively), but there was no relation between BMD and Bsm1 polymorphism. FokI gene polymorphism may be one of the contributing factors in bone loss in patients on chronic steroid therapy. High cumulative doses of corticosteroids increased bone resorption in young chronic ITP patients. Longitudinal studies are needed to confirm the effect of different steroid protocols on bone turnover. Protocols of therapy of chronic ITP should restrict corticosteroid use in growing children and favor alternative less harmful therapies.

Predictors of bone disease in Egyptian prepubertal children with ß-thalassaemia major.

INTRODUCTION: Thalassaemic osteopathy is a multifactorial disorder and limited information exists about bone accrual and bone mineral density (BMD) in prepubertal thalassaemic children. The study aimed to investigate some potential genetic and biochemical bone markers as possible early predictors of BMD variations in children with ß-thalassaemia major (TM) before puberty. MATERIAL AND METHODS: Thirt-one prepubertal children with ß-TM, and 43 matched controls were subjected to BMD assessment by dual energy X-ray absorptiometry (DEXA). Vitamin D receptor (VDR) gene polymorphisms (Bsm1, Fok1) and the biochemical bone markers serum osteocalcin and propeptide I procollagen (CPIP) and urinary deoxypyridinoline (DPD) excretion were assessed. RESULTS: Bone mineral density was reduced in 25% of thalassaemics at the spine and 15.4% at the hip region. Significantly higher levels of urinary DPD and lower serum osteocalcin and CPIP levels were found in the studied thalassaemic children compared to controls (p < 0.001). A significant negative correlation was present between BMD in spine and hip and the patients' age (r = -0.6367, p = 0.0002 and r = -0.616, p = 0.00079, respectively). There was a significant reduction in BMD in males compared to females. Reduced BMD was more frequent in male patients with genotypes bb and Ff but not in females. Bone mineral density was not related to the studied biochemical bone markers, mean pre-transfusion haemoglobin or serum ferritin. CONCLUSIONS: Routine BMD screening with DEXA is proposed to be a sensitive predictor for early bone changes, particularly at the lumbar spine. DR gene polymorphisms of Bsm1 and Fok1 polymorphisms may be determinants of BMD in Egyptian prepubertal male thalassemics.

Malondialdehyde and coenzyme Q10 in platelets and serum in type 2 diabetes mellitus: correlation with glycemic control.

This study investigated the level of platelet malondialdehyde (MDA) as a marker of oxidative stress and coenzyme Q10 (CoQ10) as an index of antioxidant capacity in patients with type 2 diabetes mellitus and their relation to glycemic control. The study group consisted of 28 patients with type 2 diabetes mellitus (10 men and 18 women) with mean age of 48 +/- 2 years. Ten healthy individuals, age and sex matched with the patients, were used as a control group. Laboratory investigations in the form of lipid profile, glycosylated hemoglobin, plasma MDA, platelet MDA and plasma CoQ10 were assessed for all patients and controls. The study revealed that plasma and platelet MDA, as a marker of oxidative stress, were significantly higher in diabetic patients than in controls. The level of CoQ10, as antioxidant capacity, was significantly lower in diabetic patients than in controls. There was a negative correlation between plasma CoQ10 concentrations and glycosylated hemoglobin. Type 2 diabetic patients are at increased risk of oxidative stress manifested by increased plasma MDA as well as platelet MDA and decreased CoQ10, and this oxidative stress increases with poor glycemic control.

The spectrum of inherited bleeding disorders in pediatrics.

Inherited bleeding disorders (IBDs) are caused by quantitative and qualitative alterations of either platelets or plasma proteins involved in coagulation and fibrinolysis. Hemophilias are the most frequent IBDs; however, accumulated data from various studies reported that von Willebrand disease (VWD) is the most common cause of IBD, with an increased incidence of platelet function defects, mostly due to the increased rate of consanguinity in some communities. VWD is an inherited disorder of homeostasis due to quantitative or qualitative defect of von Willebrand factor. Data on its epidemiology and impact in developing countries are limited. The objective of this study was to assess the local prevalence of some IBD and establish the clinical and historical variables that are predictive for those bleeding disorders in pediatrics. The study involved 43 children with various bleeding manifestations and 15 age- and sex-matched controls, recruited from the Pediatrics Hematology Clinic at the National Research Centre, Sausan Mubarek children's hospital in Cairo, Egypt and the King Abdulaziz University Hospital, Jeddah, Kingdom of Saudi Arabia. Hematological profile included platelet counts and function, prothrombin time, partial thromboplastin time, factor VIII antigen and its activity, factor IX antigen and its activity, von Willebrand factor and its activity assayed with multimeric analysis. A total of 12 (27.9%) children had VWD, 11 (25.5%) had hemophilia A, three (7%) had hemophilia B, seven (16.3%) had platelet dysfunction and 10 (23.3%) had bleeding with undiagnosed cause. Two of the VWD cases had type I, three had type II, four had type III and one case appeared to have type IIM and another to have IIB VWD. Bruising and epistaxis were the main symptoms in all children with VWD The majority of platelet dysfunction disorders were diagnosed as Glanzmann's thrombasthenia. VWD and Glanzmann's thrombasthenia should be considered not uncommon causes of IBDs in children in Egypt and Kingdom of Saudi Arabia. Routine hematological screening should be mandatory in children with positive family history of bruising and bleeding as a predictor for IBD.

Study of factor VII, tissue factor pathway inhibitor and monocyte tissue factor in noninsulin-dependent diabetes mellitus.

Changes in plasma tissue factor (TF)-activated factor VII (FVIIa) and plasma tissue factor pathway inhibitor (TFPI) in type II diabetes mellitus are assessed, vascular complicated and noncomplicated patients compared, and whether these novel hemostatic activity markers predict vascular complications in diabetic patients, improving risk assessment, is determined. Fifty type II diabetic patients and 20 healthy controls (age, sex and body mass matched) underwent medical history and examination, fasting plasma glucose level, glycosylated hemoglobin (HbA1c), lipid profile, hemostatic parameters, plasma TF activity, and TFPI and TF expression on blood monocytes. Mean TF, TF activity, TFPI, and FVIIa significantly increased among hyperlipidemic compared with normolipidemic diabetic patients, and normolipidemic diabetic patients compared with controls. Mean percentage TF-positive monocytes with and without lipopolysaccharide, plasma TF activity, TFPI and FVIIa were significantly higher among complicated than noncomplicated diabetic patients. Mean percentage TF-positive monocytes without and with lipopolysaccharide, plasma TF activity, plasma TFPI and FVIIa were higher among diabetic patients with macrovascular compared with microvascular complications. High significant correlation occurred between HbA1c, triglycerides and percentage TF-positive monocytes with and without lipopolysaccharide stimulation, plasma TF activity and both FVIIa and TFPI. High activity levels of plasma TF and FVIIa with increased circulating TF-positive monocytes occurred in type II diabetic patients, especially with vascular complications. Results reflect high procoagulant activity possibly involved in diabetic vascular complications. Elevated TFPI levels were observed, but were not sufficient to balance high procoagulant activity. Correlation of procoagulant activity markers with HbA1c reinforces the importance of optimal glycemic control in type II diabetes.

Anti-beta2-glycoprotein I in childhood immune thrombocytopenic purpura.

Immune thrombocytopenic purpura (ITP) etiology is not clarified. Phospholipid antigen antibodies (aPls) occur in ITP patient sera. We studied predictive values of elevated anti-beta2-glycoprotein I (anti-beta2-GP1) or anticardiolipin antibody (aCl) concentrations for secondary ITP detection, comparing levels with steroid therapy responsiveness in three groups of children and adolescents. Participants' antinuclear antibodies, aCls (IgM, IgG) and anti-beta2-GPI (IgG) were assessed. Significantly higher aCl (IgM), aCl (IgG) and anti-beta2-GPI (IgG) mean concentrations occurred in chronic ITP cases compared with acute or control cases. Of chronic ITP cases, 77.8% showed elevated IgG aCl serum concentrations, and all presented increased IgG anti-beta2-GPI serum levels. Significant positive correlation between increased levels of IgG anti-beta2-GPI and increased IgG aCl serum concentrations was determined; these increased IgG concentrations significantly correlated with steroid therapy resistance. A total of 76.1% of ITP cases had positive aPls (all chronic ITP cases, five acute ITP cases). Elevated aCl or anti-beta2-GPI serum IgG isotype concentrations occurred in all nine splenectomized ITP children with positive aPls (three showed increased IgM aCl levels). Follow-up of the initially studied ITP children (2000-2004) revealed 16.7% developed clinical and laboratory criteria of systemic lupus erythrematosus (one acute ITP in remission, six chronic ITP); elevated IgG aCl serum concentrations were found at study start in these seven cases, and six had increased anti-beta2-GPI. IgG classes of both aCls and anti-beta2-GPI may be determinant cofactors for the developing risk of antiphospholipid syndrome or autoimmune diseases in ITP. Great attention should be paid to both assays as predictors for steroid therapy response.

Study of genetic polymorphism of xenobiotic enzymes in acute leukemia.

The work studied possible association between genetic polymorphisms of CYP2D6, GSTM1, GSTT1and NQO1 and altered susceptibility to leukaemia, correlating these genetic polymorphisms with clinical prognostic data, response to therapy and relapse. The study included 32 leukaemia patients, 19 with acute myeloid leukemia (AML) and 13 with acute lymphoid leukaemia (ALL), and 11 normal individuals (control group). Basic investigations for the diagnosis of AML and ALL were performed, including blood picture, bone marrow aspirate, cytochemistry and immunophenotyping for detection of subtypes. Detection of CYP2D6, NQO1, GSTM1 and GSTT1 genetic polymorphisms used a polymerase chain reaction-restriction fragment length polymorphism. A follow-up was made for association between the outcome of patients and different patterns of genetic polymorphisms. Results demonstrate a significant increase in the frequency of CYP2D6 wild-type and GSTM1 null genotypes in the acute leukaemia group compared with the control. Studying the relationship between polymorphisms of these genes and the outcome of our cases revealed the wild genotype of CYP2D6 significantly influenced the outcome of acute leukaemia particularly in AML cases, while GSTM1 null genotype was associated with bad prognosis among the ALL group. The study also revealed that patients with combined mutant CYP2D6/present GSTM1/present GSTT1 achieved the best prognosis, suggesting synergistic impact of these genetic polymorphisms on the outcome of acute leukaemia cases. This case-control study suggests a contribution of CYP2D6 and GSTM1 null variants in the development of acute leukaemia. In addition, GSTM1 and GSTT1 genotypes were apparently related to response, side effects and prognosis of patients with AML.