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Meningeal Hemangiopericytomas and Meningomas: a Comparative Immunohistochemical and Genetic Study
Trabelsi, Saoussen,Mama, Nadia,Chourabi, Maroua,Mastouri, Maroua Haddaji,Ladib, Mohamed,Popov, Sergey,Burford, Anna,Mokni, Moncef,Tlili, Kalthoum,Krifa, Hedi,Jones, Chris,Yacoubi, Mohamed Tahar,Saad, Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.16
Background: The meningeal hemangiopericytoma (MHPC) is a vascular tumor arising from pericytes. Most intracranial MHPCs resemble meningiomas (MNGs) in their clinical presentation and histological features and may therefore be misdiagnosed, despite important differences in prognosis. Materials and Methods: We report 8 cases of MHPC and 5 cases of MNG collected from 2007 to 2011 from the Neuro-Surgery and Histopathology departments. All 13 samples were re reviewed by two independent pathologists and investigated by immunohistochemistry (IHC) using mesenchymal, epithelial and neuro-glial markers. Additionally, we screened all tumors for a large panel of chromosomal alterations using multiplex ligation probe amplification (MLPA). Presence of the NAB2-STAT6 fusion gene was inferred by immunohistochemical staining for STAT6. Results: Compared with MNG, MHPCs showed strong VIM (100% of cases), CD99 (62%), bcl-2 (87%), and p16 (75%) staining but only focal positivity with EMA (33%) and NSE (37%). The p21 antibody was positive in 62% of MHPC and less than 1% in all MNGs. MLPA data did not distinguish HPC from MNG, with PTEN loss and ERBB2 gain found in both. By contrast, STAT6 nuclear staining was observed in 3 MHPC cases and was absent from MNG. Conclusions: MNG and MHPC comprise a spectrum of tumors that cannot be easily differentiated based on histopathology. The presence of STAT6 nuclear positivity may however be a useful diagnostic marker.
Glioma Epidemiology in the Central Tunisian Population: 1993-2012
Trabelsi, Saoussen,Brahim, Dorra H'mida-Ben,Ladib, Mohamed,Mama, Nadia,Harrabi, Imed,Tlili, Kalthoum,Yacoubi, Mohamed Tahar,Krifa, Hedi,Hmissa, Sihem,Saad, Ali,Mokni, Moncef Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.20
Background: Glioma is a heterogeneous central nervous system (CNS) tumor group that encompasses different histological subtypes with high variability in prognosis. The lesions account for almost 80% of primary malignant brain tumors. The aim of this study is to extend our understanding of the glioma epidemiology in the central Tunisian region. Materials and Methods: We analyzed 393 gliomas recorded in cancer registry of central Tunisia from 1993 to 2012. Crude incidence rates (CR) and world age-standardized rates (ASR) were estimated using annual population data size and age structure. Statistic correlations were established using Chi-square and Kaplan-Meier test. Results: Tunisian glioma patients were identified with a mean age at diagnosis of 48 years and 1.5 sex ratio (male/female). During the 19 years period of study the highest incidence value was observed in male group between 1998 and 2002 (CR: 0.28, ASR: 0.3). Incidence results underline increasing high grade glioma occurring in the adulthood in the last period (2007-2012). Median survival was 27 months, with 1-, 2- and 5-year survival rates of 42%, 30% and 26%, respectively. Survival was greater in patients with younger age, lower tumor grade, infratentrial tumor location and undergoing a palliative treatment. Conclusions: This central Tunisia gliomas registry study provides important information that could improve glioma management and healthcare practice.
walid Trabelsi,Mondher Belhaj Amor,Mohamed Anis Lebbi,Chiheb Romdhani,Sami Dhahri,Mustapha Ferjani 대한마취통증의학회 2013 Korean Journal of Anesthesiology Vol.64 No.4
Background: Infraclaviculr Brachial plexus (ICBP) block is useful for upper extremity surgery. The aim of this study was to compare the ultrasound (US) technique with the nerve stimulation (NS) technique in their success rates and times to perform ICBP block. Methods: 60 patients undergoing surgery of the upper limb were randomly allocated into two groups (n = 30 per group). Group 1; US, and Group 2; NS. Procedure time (including time for initial ultrasound examination), the success rate and the onset time of sensory and motor blockade were assessed. Results: The time needed to perform the ICBP block is similar in both groups (220 seconds ± 130 in US group versus 281 ± 134 seconds in NS group; P = 0.74). The success rate of all the nerve blocks in the US group was 100%. The success rate in the NS group was 73.3%, 76.7%, 76.7% and 100% for radial, ulnar, medial, and musculocutaneous nerve, respectively. A significantly faster onset of sensory block for the radial, ulnar, median, musculocutaneous, and the four nerves considered together were observed. The onset of motor block for the radial, ulnar, and medial nerves was faster in the US group. However, the onset of motor block for the musculocutaneous nerve and the four nerves considered together was comparable between the two groups. Conclusions: The ultrasound-guided infraclavicular brachial plexus block is a significantly efficacious method with faster onset but similar procedure time compared to the nerve stimulation technique.
Social Capital and Economic Growth: Empirical Investigations on the Transmission channels
Ghazi BOULILA,Lobna BOUSRIH,Mohamed TRABELSI 한국국제경제학회 2008 International Economic Journal Vol.22 No.3
This paper explores the possible transmission channels of social capital to economic growth for a sample of some developed and developing countries during the period 1980-2000, using a simultaneous equation model. The main results of this paper are first, the level of trust as a measure of social capital and growth are significantly and positively correlated. Second, a high level of trust has also an indirect effect on economic activity through its effect on institutional development. Third, such results are found to be robust statistically with the extreme bound analysis (EBA). It corroborates the fact that an improvement of the social infrastructure with high levels of trust and cooperation between individuals has not only a direct but also an indirect effect on economic growth through the development of institutions in the economy.
Yusuke Tajima,Yuta Hori,Takayuki Ino,Tomoki Yokoyama,Lazhar Ben-Brahim,Mohamed Trabelsi 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Multi-cell inverter include an array of single-phase inverters capable of handling higher voltage ratings with lower rating power electronics devices. In this paper, a deadbeat control combined with a multi-sampling compensation method is proposed to control a Variable Frequency Drive (VFD) fed by a multi-cell inverter and realize real time digital feedback control using FPGA based hardware controller. This digital control is characterized by a very fast transient response, low switching losses, and a proper compensation for load disturbances and cyclical fluctuations.