References of "Waltregny, David"
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See detailThe original versus a modified inside-out transobturator procedure: 1-year results of a prospective randomized trial.
De Leval, Jean ULg; Thomas, Alexandre ULg; Waltregny, David ULg

in International Urogynecology Journal & Pelvic Floor Dysfunction (2011), 22(2), 145-156

INTRODUCTION AND HYPOTHESIS: The aim of this study is to compare a modified inside-out transobturator procedure with its original counterpart [inside-out transobturator (TVT-O)] for the treatment of ... [more ▼]

INTRODUCTION AND HYPOTHESIS: The aim of this study is to compare a modified inside-out transobturator procedure with its original counterpart [inside-out transobturator (TVT-O)] for the treatment of female stress urinary incontinence (SUI). METHODS: A prospective, randomized trial in women suffering from SUI was used. The modified procedure consisted of a shorter tape whilst the scissors or guide no longer perforated the obturator membrane. The primary outcome was the resolution of subjective and objective SUI at 1 year. Secondary outcome measures included adverse events, quality of life measures, and groin pain. RESULTS: One hundred seventy-five patients were randomized. No intraoperative complications were recorded. The SUI cure rate was 91.7% versus 90.7% (original versus modified, respectively; p = 0.824). Incidence and intensity of groin pain was higher in the original TVT-O group on day 0 and 1 (p < 0.05), requiring more analgesics (p = 0.015) but not thereafter. CONCLUSIONS: At 1 year follow-up, the modified inside-out transobturator tape procedure was as efficient and safe as the original technique but associated with less immediate postoperative groin pain. [less ▲]

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See detailNovel post-digest isotope coded protein labeling method for phospho- and glycoproteome analysis
Fleron, Maximilien ULg; Greffe, Yannick ULg; Musmeci, Davide ULg et al

in Journal of Proteomics (2010), 73(10), 1986-2005

In the field of proteomics there is an apparent lack of reliable methodology for quantification of posttranslational modifications. Present study offers a novel post-digest ICPL quantification strategy ... [more ▼]

In the field of proteomics there is an apparent lack of reliable methodology for quantification of posttranslational modifications. Present study offers a novel post-digest ICPL quantification strategy directed towards characterization of phosphorylated and glycosylated proteins. The value of the method is demonstrated based on the comparison of two prostate related metastatic cell lines originating from two distinct metastasis sites (PC3 and LNCaP). The method consists of protein digestion, ICPL labeling, mixing of the samples, PTM enrichment and MS-analysis. Phosphorylated peptides were isolated using TiO(2), whereas the enrichment of glycosylated peptides was performed using hydrazide based chemistry. Isolated PTM peptides were analyzed along with non enriched sample using 2D-(SCX-RP)-Nano-HPLC-MS/MS instrumentation. Taken together the novel ICPL labeling method offered a significant improvement of the number of identified (∼600 individual proteins) and quantified proteins (>95%) in comparison to the classical ICPL method. The results were validated using alternative protein quantification strategies as well as label-free MS quantification method. On the biological level, the comparison of PC3 and LNCaP cells has shown specific modulation of proteins implicated in the fundamental process related to metastasis dissemination. Finally, a preliminary study involving clinically relevant autopsy cases reiterated the potential biological value of the discovered proteins. [less ▲]

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See detailRésistance au traitement par GnRH agonistes dans le cancer de la prostate métastatique
Valdes Socin, Hernan Gonzalo ULg; Waltregny, David ULg; Beckers, Albert ULg

in Annales d'Endocrinologie (2010, September), 71(5), 396

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See detailComplete Resistance to Gonadotropin Hormone Releasing Hormone (Gn-RH) Agonist Therapy for Metastatic Prostate Cancer
Valdes Socin, Hernan Gonzalo ULg; Waltregny, David ULg; Beckers, Albert ULg

in European Neuroendocrine Association - Liège, 22-25 septembre 2010 (2010, September)

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See detailAn anatomic comparison of the traditional TVT-O versus a modified TVT-O procedure
Hinoul, Piet; Bonnet, Pierre ULg; De Roover, CHRISTOPHE ULg et al

in Gynecological Surgery (2010), 7(Suppl 1), 121

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See detailVers une approche moins invasive du traitement chirurgical de l'incontinence urinaire féminine: la voie transoburatrice de dedans en dehors (TVT-O)
Waltregny, David ULg; THOMAS, Alexandre ULg; de Leval, Jean ULg

in Andrologic (2010), 6(5), 1-4

Plusieurs essais randomisés et méta-analyses récentes ont montré que la voie transobturatrice est, à moyen terme, aussi efficace et plus sécurisante que la voie rétropubienne pour la mise en place d’une ... [more ▼]

Plusieurs essais randomisés et méta-analyses récentes ont montré que la voie transobturatrice est, à moyen terme, aussi efficace et plus sécurisante que la voie rétropubienne pour la mise en place d’une bandelette sous-urétrale pour traiter l’incontinence urinaire d’effort (IUE) féminine. En effet, la voie transobturatrice est associée à des taux de guérison subjective de l’IUE similaires (± 85-90%) mais à un risque moindre de saignement, de perforation vésicale et de troubles mictionnels postopératoires. La voie transobturatrice de dedans en dehors (‘Tension-free Vaginal Tape - Obturator’, TVT-O) a été développée en 2003 par Jean de Leval dans le but de réduire le risque de perforation de la vessie et de l’urètre tout en minimisant la dissection chirurgicale nécessaire pour insérer la bandelette. A ce jour, plus de 50 études cliniques, incluant 18 essais randomisés et 3 registres nationaux réalisés en France, Autriche et Norvège, ont largement démontré les excellents résultats à moyen terme (2-5 ans de suivi) de la technique TVT-O. Plus récemment, nous avons apporté deux modifications à la procédure TVT-O, à savoir l’utilisation d’une bandelette plus courte, de 12cm de long, insérée sans perforer la membrane obturatrice par les ciseaux ou le guide. Nos travaux anatomiques sur cadavres ont montré que cette bandelette plus courte est ancrée dans les muscles obturateurs et la membrane obturatrice mais évite dans une large mesure les muscles adducteurs. D’un point de vue clinique, nous avons comparé l’approche TVT-O originale à la version modifiée, potentiellement moins invasive, au travers d’un essai clinique prospectif randomisé. Les résultats de cet essai, présentés au congrès conjoint de l’International Continence Society (ICS) et de l’International Urogynecology Association (IUGA) à Toronto, ont montré qu’après suivi minimal d’1 an, les 2 approches génèrent des taux de guérison de l’IUE élevés et des taux de complications postopératoires très faibles, similaires pour les 2 procédures, la procédure modifiée étant néanmoins associée à une incidence et à une sévérité de douleurs de cuisse postopératoires immédiates significativement moindres. [less ▲]

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See detailDe novo lipogenesis protects cancer cells from free radicals and chemotherapeutics by promoting membrane lipid saturation.
Rysman, Evelien; Brusselmans, Koen; Scheys, Katryn et al

in Cancer Research (2010), 70(20), 8117-26

Activation of de novo lipogenesis in cancer cells is increasingly recognized as a hallmark of aggressive cancers and has been implicated in the production of membranes for rapid cell proliferation. In the ... [more ▼]

Activation of de novo lipogenesis in cancer cells is increasingly recognized as a hallmark of aggressive cancers and has been implicated in the production of membranes for rapid cell proliferation. In the current report, we provide evidence that this activation has a more profound role. Using a mass spectrometry-based phospholipid analysis approach, we show that clinical tumor tissues that display the lipogenic phenotype show an increase in the degree of lipid saturation compared with nonlipogenic tumors. Reversal of the lipogenic switch in cancer cells by treatment with the lipogenesis inhibitor soraphen A or by targeting lipogenic enzymes with small interfering RNA leads to a marked decrease in saturated and mono-unsaturated phospholipid species and increases the relative degree of polyunsaturation. Because polyunsaturated acyl chains are more susceptible to peroxidation, inhibition of lipogenesis increases the levels of peroxidation end products and renders cells more susceptible to oxidative stress-induced cell death. As saturated lipids pack more densely, modulation of lipogenesis also alters lateral and transversal membrane dynamics as revealed by diffusion of membrane-targeted green fluorescent protein and by the uptake and response to doxorubicin. These data show that shifting lipid acquisition from lipid uptake toward de novo lipogenesis dramatically changes membrane properties and protects cells from both endogenous and exogenous insults. These findings provide important new insights into the role of de novo lipogenesis in cancer cells, and they provide a rationale for the use of lipogenesis inhibitors as antineoplastic agents and as chemotherapeutic sensitizers. [less ▲]

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See detailDiverse phenotypic profile of uterine tumors resembling ovarian sex cord tumors: an immunohistochemical study of 12 cases.
de Leval, Laurence ULg; Lim, Gkeok Stzuan Diana; Waltregny, David ULg et al

in American Journal of Surgical Pathology (2010), 34(12), 1749-61

BACKGROUND: Uterine tumors resembling ovarian sex cord tumors (UTROSCTs) are rare neoplasms thought to be of putative endometrial stromal origin and solely composed of sex cord elements. Our study aimed ... [more ▼]

BACKGROUND: Uterine tumors resembling ovarian sex cord tumors (UTROSCTs) are rare neoplasms thought to be of putative endometrial stromal origin and solely composed of sex cord elements. Our study aimed to delineate the immunophenotype of these tumors and to verify whether their morphology reflects true sex cord-like differentiation. DESIGN: Representative paraffin blocks from 12 UTROSCTs were selected after confirmation of the diagnosis. Cords and/or trabeculae were seen in all tumors, whereas tubules, diffuse areas, and a retiform pattern were present in 9, 6, and 2 cases, respectively. Tumors were stained for sex cord (inhibin, calretinin, WT1, and melan-A), epithelial (KL1 and epithelial membrane antigen), and smooth muscle markers (smooth muscle actin, desmin, smooth muscle myosin heavy chain, h-caldesmon, and histone deacetylase-8), CD10, HMB45, S100, and CD117. Intensity and percentage of staining were recorded. RESULTS: Six out of 12 tumors were positive for sex cord markers (inhibin 3 of 12, calretinin 4 of 12, WT1 4 of 12, and melan-A 3 of 11) with 4 tumors coexpressing more than one marker. Half of the UTROSCTs showed positivity for KL1, with 2 tumors coexpressing epithelial membrane antigen. All but one tumor expressed one or more smooth muscle markers, with smooth muscle actin, desmin and histone deacetylase-8 being most commonly expressed. CD10 was positive in 6 of 12 tumors, CD117 in 4 of 12, and S100 in 2 of 11 tumors, whereas HMB45 was negative in 11 tumors tested. CONCLUSIONS: UTROSCTs have a diverse immunohistochemical profile often coexpressing sex cord, epithelial, and smooth muscle markers. The expression of smooth muscle markers in these tumors does not imply a smooth muscle origin as endometrial and sex cord stromal tumors are not infrequently positive for these markers. Positivity for sex cord markers supports a true sex cord/steroid phenotype. Although the immunohistochemical profile of these tumors overlaps with that of endometrial stromal tumors with sex cord-like differentiation as well as ovarian sex cord stromal tumors, the origin of UTROSCT remains uncertain. [less ▲]

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See detailVers une approche moins invasive de la voie transoburatrice de dedans en dehors (TVT-O) pour le traitement de l’incontinence urinaire féminine: dissection réduite et bandelette plus courte
Waltregny, David ULg; Thomas, Alexandre ULg; de Leval, Jean ULg

in Andrologic (2010), 6

Plusieurs essais randomisés et méta-analyses récentes ont montré que la voie transobturatrice est, à moyen terme, aussi efficace et plus sécurisante que la voie rétropubienne pour la mise en place d’une ... [more ▼]

Plusieurs essais randomisés et méta-analyses récentes ont montré que la voie transobturatrice est, à moyen terme, aussi efficace et plus sécurisante que la voie rétropubienne pour la mise en place d’une bandelette sous-urétrale pour traiter l’incontinence urinaire d’effort (IUE) féminine. En effet, la voie transobturatrice est associée à des taux de guérison subjective de l’IUE similaires (±85-90%) mais à un risque moindre de de saignement, de perforation vésicale et de troubles mictionnels postopératoires. La voie transobturatrice de dedans en dehors (‘Tension-free Vaginal Tape - Obturator’, TVT-O) a été développée en 2003 par Jean de Leval dans le but de réduire le risque de perforation de la vessie et de l’urètre tout en minimisant la dissection chirurgicale nécessaire pour insérer la bandelette. A ce jour, plus de 50 études cliniques, incluant 18 essais randomisés et 3 registres nationaux réalisés en France, Autriche, et Norvège, ont largement démontré les excellents résultats à moyen terme (2 à 5 ans de suivi) de la technique TVT-O. Plus récemment, nous avons apporté deux modifications à la procédure TVT-O, à savoir l’utilisation d’une bandelette plus courte, de 12 cm de long, insérée sans perforer la membrane obturatrice par les ciseaux ou le guide. Nos travaux anatomiques sur cadavres ont montré que cette bandelette plus courte est ancrée dans les muscles obturateurs et la membrane obturatrice mais évite dans une large mesure les muscles adducteurs. D’un point de vue clinique, nous avons comparé l’approche TVT-O originale à la version modifiée, potentiellement moins invasive, au travers d’un essai clinique prospectif randomisé. Les résultats de cet essai, présentés au congrès conjoint de l’International Continence Society (ICS) et de l’International Urogynecology Association (IUGA) à Toronto, ont montré qu’après suivi minimal d’1 an, les 2 approches génèrent des taux de guérison de l’IUE élevés et des taux de complications postopératoires très faibles, similaires pour les 2 procédures, la procédure modifiée étant néanmoins associée à une incidence et à une sévérité de douleurs de cuisse postopératoires immédiates significativement moindres. [less ▲]

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See detailVersican overexpression in human breast cancer lesions: Known and new isoforms for stromal tumor targeting.
Kischel, Philippe ULg; Waltregny, David ULg; Dumont, Bruno ULg et al

in International Journal of Cancer = Journal International du Cancer (2010), 126(3), 640-50

Proteoglycans play a key role in cancer development and progression by participating in the constitution of a specific fertile tumor microenvironment. As they are largely overexpressed in the malignant ... [more ▼]

Proteoglycans play a key role in cancer development and progression by participating in the constitution of a specific fertile tumor microenvironment. As they are largely overexpressed in the malignant stroma, proteoglycans provide a reservoir of potential new targets for anticancer therapies, because they can serve to convey toxic payloads in the close proximity of cancer cells and subsequently destroy them. In this context, versican, a proteoglycan largely overexpressed in several solid cancers, bears the potential to be such an ideal target. As 4 main versican isoforms have been characterized, we sought to determine which isoform could represent the best target in human breast cancer. We used a series of 10 primary breast cancer lesions that were characterized as overexpressing the versican protein, when compared with matched normal breast tissues, using shotgun mass spectrometry and immunohistochemistry experiments. Quantitative polymerase chain reaction and western-blotting experiments were used to evaluate versican isoform expression in breast cancer/normal tissue pairs for which ARN quality was excellent. All known isoforms were significantly overexpressed in the malignant lesions, both at the mRNA and at the protein levels. In the course of this study, we also identified and cloned a new alternatively spliced versican isoform, referred to as V4, which was also found to be upregulated in human breast cancer. This study provides for the first time a comprehensive mRNA and protein analysis of versican isoforms expression in human breast tissues, and offers insights into which therapeutic strategy would be best suited to target versican in human breast cancer lesions. [less ▲]

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See detailIdentification and Validation of the Methylated TWIST1 and NID2 Genes through Real-Time Methylation-Specific Polymerase Chain Reaction Assays for the Noninvasive Detection of Primary Bladder Cancer in Urine Samples.
Renard, Isabelle; Joniau, Steven; van Cleynenbreugel, Ben et al

in European urology (2010)

BACKGROUND: Accumulating evidence suggests that DNA methylation markers could serve as sensitive and specific cancer biomarkers. OBJECTIVE: To determine whether a panel of methylated genes would have the ... [more ▼]

BACKGROUND: Accumulating evidence suggests that DNA methylation markers could serve as sensitive and specific cancer biomarkers. OBJECTIVE: To determine whether a panel of methylated genes would have the potential to identify primary bladder cancer (BCa) in voided urine samples. DESIGN, SETTING, AND PARTICIPANTS: A pharmacologic unmasking reexpression analysis in BCa cell lines was initially undertaken to unveil candidate methylated genes, which were then evaluated in methylation-specific polymerase chain reaction (MSP) assays performed on DNA extracted from noncancerous and cancerous bladder tissues. The most frequently methylated genes in cancerous tissues, with 100% specificity, were retained for subsequent MSP analysis in DNA extracted from urine samples to build and validate a panel of potential methylated gene markers. Urine samples were prospectively collected at three urologic centres from patients with histologically proven BCa and processed for use in real-time MSP and cytologic analysis. Patients with nonmalignant urologic disorders were included as controls. MEASUREMENTS: A urine sample was classified as valid when >/=10 copies of the gene encoding ss-actin were measured in the urine sediment genomic DNA. Sensitivity, specificity, and predictive values of the MSP and cytology tests were assessed and compared. RESULTS AND LIMITATIONS: MSP assays performed on 466 of the 496 (94%) valid urine samples identified two genes, TWIST1 and NID2, that were frequently methylated in urine samples collected from BCa patients, including those with early-stage and low-grade disease. The sensitivity of this two-gene panel (90%) was significantly better than that of cytology (48%), with comparable specificity (93% and 96%, respectively). The positive predictive value and negative predictive value of the two-gene panel was 86% and 95%, respectively. CONCLUSIONS: Detection of the methylated TWIST1 and NID2 genes in urine sediments using MSP provides a highly (>/=90%) sensitive and specific, noninvasive approach for detecting primary BCa. TRIAL REGISTRATION: BlCa-001 study - EudraCt 2006-003303-40. [less ▲]

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See detailUpdated Systematic Review and Meta-Analysis of the Comparative Data on Colposuspensions, Pubovaginal Slings, and Midurethral Tapes in the Surgical Treatment of Female Stress Urinary Incontinence.
Novara, G.; Artibani, W.; Barber, M. D. et al

in European Urology (2010)

CONTEXT: Burch colposuspension, pubovaginal sling, and midurethral retropubic tape (RT) and transobturator tape (TOT) have been the most popular surgical treatments for female stress urinary incontinence ... [more ▼]

CONTEXT: Burch colposuspension, pubovaginal sling, and midurethral retropubic tape (RT) and transobturator tape (TOT) have been the most popular surgical treatments for female stress urinary incontinence (SUI). Several randomized controlled trials (RCTs) have been published comparing the different techniques, with conflicting results. OBJECTIVE: Our aim was to evaluate the efficacy, complication, and reoperation rates of midurethral tapes compared with other surgical treatments for female SUI. EVIDENCE ACQUISITION: A systematic review of the literature was performed using the Medline, Embase, Scopus, Web of Science databases, and Cochrane Database of Systematic Reviews. EVIDENCE SYNTHESIS: Thirty-nine RCTs were identified. Patients receiving midurethral tapes had significantly higher overall (odds ratio [OR]: 0.61; confidence interval [CI]: 0.46-0.82; p=0.00009) and objective (OR: 0.38; CI: 0.25-0.57; p<0.0001) cure rates than those receiving Burch colposuspension, although they had a higher risk of bladder perforations (OR: 4.94; CI: 2.09-11.68; p=0.00003). Patients undergoing midurethral tapes and pubovaginal slings had similar cure rates, although the latter were slightly more likely to experience storage lower urinary tract symptoms (LUTS) (OR: 0.31; CI: 0.10-0.94; p=0.04) and had a higher reoperation rate (OR: 0.31; CI: 0.12-0.82; p=0.02). Patients treated with RT had slightly higher objective cure rates (OR: 0.8;CI: 0.65-0.99; p=0.04) than those treated with TOT; however, subjective cure rates were similar, and patients treated with TOT had a much lower risk of bladder and vaginal perforations (OR: 2.5; CI: 1.75-3.57; p<0.00001), hematoma (OR: 2.62; CI: 1.35-5.08; p=0.005), and storage LUTS (OR: 1.35; CI: 1.05-1.72; p=0.02). Meta-analysis demonstrated similar outcomes for TVT-O (University of Liege, Liege, Wallonia, Belgium) and Monarc (AMS, Minnetonka, MN, USA). CONCLUSIONS: Patients treated with RT experienced slightly higher continence rates than those treated with Burch colposuspension, but they faced a much higher risk of intraoperative complications. RT and pubovaginal slings were similarly effective, although patients with pubovaginal slings were more likely to experience storage LUTS. The use of RT was followed by objective cure rates slightly higher than TOT, but subjective cure rates were similar. TOT had a lower risk of bladder and vaginal perforations and storage LUTS than RT. The strength of these findings is limited by the heterogeneity of the outcome measures and the short length of follow-up. [less ▲]

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See detailLe ciblage therapeutique: vers une guerre propre et efficace contre le cancer
Castronovo, Vincenzo ULg; Waltregny, David ULg; Detry, Olivier ULg et al

Scientific conference (2009, October)

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