Publications by authors named "Werner Dolak"

Extranodal marginal zone B-cell lymphoma of the mucosa associated lymphoid tissue (MALT-lymphoma) is an indolent B-cell lymphoma with a distinct affinity for mucosal structures. Most commonly arising in the stomach, only roughly 2% of MALT-lymphomas occur in the colon or the intestine. In view of this, we have retrospectively assessed all patients with MALT-lymphoma involving the intestine for clinicopathological characteristics.

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Background And Aims: Fully covered self-expandable metal stents (FCSEMSs) are widely used in benign upper gastrointestinal (GI) conditions, but stent migration remains a limitation. An over-the-scope clip (OTSC) device (Stentfix {SF], Ovesco Endoscopy) for stent anchoring has recently been developed. The aim of this study was to evaluate the effect of OTSC fixation on FCSEMS migration rate.

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Introduction: Eosinophilic esophagitis (EoE) is a chronic immune-mediated disease of the esophagus with increasing incidence and dysphagia as the main symptom. The management of suspected or known EoE by Austrian endoscopists has not been investigated yet.

Methods: A web-based survey with 13 questions about the management of EoE was sent to endoscopists via the Austrian Society of Gastroenterology and Hepatology (ÖGGH).

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Background: Working in the field of endoscopy is associated with physical and psychological challenges, but we lack data as to whether it influences the health status of endoscopy personnel. The aim of the present survey was to evaluate the health status of endoscopy personnel in Austria and draw comparisons.

Method: In 2019, a standardized questionnaire of Hogrefe Publishers and a self-designed SurveyMonkey questionnaire were sent online to doctors (n=326) and nursing staff (n=234) working in the field of gastrointestinal endoscopy in Austria.

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Background & Aims: Irritable bowel syndrome (IBS) and inflammatory bowel diseases result in a substantial reduction in quality of life and a considerable socioeconomic impact. In IBS, diagnosis and treatment options are limited, but evidence for involvement of the gut microbiome in disease pathophysiology is emerging. Here we analyzed the prevalence of endoscopically visible mucosal biofilms in gastrointestinal disease and associated changes in microbiome composition and metabolism.

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Background & Aims: Benign biliary strictures (BBS) are complications of chronic pancreatitis (CP). Endotherapy using multiple plastic stents (MPS) or a fully covered self-expanding metal stent (FCSEMS) are acceptable treatment options for biliary obstructive symptoms in these patients.

Methods: Patients with symptomatic CP-associated BBS enrolled in a multicenter randomized noninferiority trial comparing 12-month treatment with MPS vs FCSEMS.

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There is no clear therapeutic algorithm for mucosa-associated lymphoid tissue (MALT) lymphoma beyond Helicobacter pylori eradication and while chemotherapy-based regimens are standard for MALT lymphoma patients in need of systemic treatment, it appears of interest to also investigate chemotherapy-free strategies. We have retrospectively assessed MALT lymphoma patients undergoing upfront systemic treatment, classified either as chemotherapy (=classical cytostatic agents +/- rituximab) or immunotherapy (=immunomodulatory agents or single anti-CD20 antibodies) at the Medical University Vienna 1999-2019. The primary endpoint was progression-free survival (PFS).

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Background And Aims: Minimally invasive treatments of anastomotic benign biliary stricture (BBS) after orthotopic liver transplantation (OLT) include endoscopic placement of multiple plastic stents or fully covered self-expandable metal stents (FCSEMSs). No multiyear efficacy data are available on FCSEMS treatment after OLT.

Methods: We prospectively studied long-term efficacy and safety of FCSEMS treatment in adults aged ≥18 years with past OLT, cholangiographically confirmed BBS, and an indication for ERCP with stent placement.

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Gastric mucosa-associated lymphoid tissue (MALT) lymphoma responding to upfront treatment has an excellent outcome and no further therapy is recommended, even in the presence of residual disease. However, no data exist on the influence of initial depth of remission on progression-free survival (PFS). : We investigated a correlation between PFS and depth of response, categorizing them as complete remission (CR), partial remission (PR) and stable disease (SD) in 137 consecutive patients at the Medical University Vienna.

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Background And Aims: Portal hypertensive gastropathy (PHG) is common in patients with cirrhosis and may cause bleeding. This study systematically explored the independent impact of patient characteristics, portal hypertension and hepatic dysfunction on PHG severity and associated anemia.

Methods: Patients with cirrhosis undergoing endoscopy were included in this retrospective analysis and PHG was endoscopically graded as absent, mild or severe.

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Background And Aims: Temporary single, fully covered self-expanding metal stent (FCSEMS) placement for benign biliary strictures (BBSs) associated with chronic pancreatitis (CP) may require fewer interventions than endotherapy with multiple plastic stents and may carry less morbidity than biliary diversion surgery. This study aimed to assess long-term outcomes in CP-associated BBSs after FCSEMS placement and removal.

Methods: In this open-label, multinational, prospective study, subjects with CP and a BBS treated with FCSEMS placement with scheduled removal at 10 to 12 months were followed for 5 years after FCSEMS indwell.

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Given the lack of consistent data regarding the clinico-pathological features and clonal lymphomagenesis of patients with mucosa-associated lymphoid tissue (MALT) lymphoma and histological transformation (HT), we have systematically analysed 379 patients (32% gastric, 68% extra-gastric; median follow-up 52 months) diagnosed with HT at the Medical University Vienna 1999-2017, and reassessed tissues of identified patients by polymerase chain reaction (PCR)-based clonality analysis. HT was documented in 12/379 patients (3·2%) and occurred at a median time of 22 months (range; 6-202 months) after diagnosis of MALT lymphoma. By PCR-based clonality analysis, we detected a clear-cut clonal relationship of MALT lymphoma and diffuse large B-cell lymphoma (DLBCL) in 8 of 11 analysed cases proving that the large majority of DLBCL following MALT lymphoma are clonally-related and constitute a real transformation.

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Purpose: Standardized uptake values (SUV), total metabolic tumor volumes (TMTV), and total lesion glycolysis (TLG) based on positron emission tomography with 2-deoxy-2-[F]fluoro-D-glucose ([F]FDG/positron emission tomography (PET) are established outcome predictors in FDG-avid lymphomas. We therefore investigated whether these biomarkers also have prognostic value in extranodal marginal zone B cell lymphoma of the mucosa-associated lymphoid tissue (MALT lymphoma), with a focus on patients treated with anti-CD20 antibody-based immunotherapy.

Procedures: Pre-therapeutic [F]FDG/PET scans of 61 treatment-naïve MALT lymphoma patients, including 35 scheduled for anti-CD20 antibody-based immunotherapy, were included in this retrospective study.

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Background: The frequency of endoscopically apparent gastrointestinal tract (GI) involvement in patients with mantle cell lymphoma (MCL) at diagnosis is thought to be in the range of 30%. While reports on GI involvement in MCL patients exist, most series lack a strict GI assessment due to the often asymptomatic nature of GI involvement. Owing to the standardized staging routine at our institution including GI assessment at diagnosis, we have analyzed the rate and prognostic impact of GI involvement in MCL.

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Background: Current guidelines favour the use of bleeding stents over balloon tamponade (BT) for refractory variceal bleeding (VB) from oesophageal varices. However, data on the efficacy and safety of self-expandable metal SX-ELLA Danis stents (SEMS) are limited.

Methods: Cirrhotic patients receiving SEMS for VB at four tertiary care centres were included in this retrospective multicentre study.

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The macrolide clarithromycin has been reported as active for therapy of mucosa associated lymphoid tissue (MALT) lymphoma. Pharmacokinetic properties, however, require continuous daily intake over a prolonged period of time. As the macrolide azithromycin is characterized by a long half-life as well as potential antineoplastic activity in vitro, we have performed a phase II trial of long-term once-weekly oral azithromycin for treatment of MALT lymphoma.

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Background And Aims: The prevalence of Helicobacter pylori (H. pylori) tends to be lower in Western countries such as central Europe compared with Asia. The virulence of H.

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Primary follicular lymphoma of the duodenum (FL-D) constitutes a rare subtype of extranodal follicular lymphoma with a usually indolent course. To date, no distinct treatment recommendations have been defined for those patients. We report the case of a 58-year-old male patient presenting with endoscopically assessed, symptomatic FL-D who was treated with clarithromycin monotherapy in analogy to recent data for mucosa-associated lymphoid tissue lymphoma.

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Background: () causes a diversity of gastric diseases. Rapid urease tests (RUT) are well established for the point-of-care, invasive diagnosis of infection. The study aimed to evaluate the diagnostic performance of a new liquid RUT, the preOx-HUT, within a prospective cohort of treatment-naïve patients.

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The Billroth III guidelines were developed during a consensus meeting of the Austrian Society of Gastroenterology and Hepatology (ÖGGH) and the Austrian Society of Interventional Radiology (ÖGIR) held on 18 February 2017 in Vienna. Based on international guidelines and considering recent landmark studies, the Billroth III recommendations aim to help physicians in guiding diagnostic and therapeutic strategies in patients with portal hypertension.

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Background And Aim: Symptomatic cervical heterotopic gastric mucosa, also known as cervical inlet patch (CIP), may present in various shapes and causes laryngopharyngeal reflux (LPR). Unfortunately, argon plasma coagulation, standard treatment of small symptomatic CIP, is limited in large CIP mainly because of concerns of stricture formation. Therefore, we aimed to investigate radiofrequency ablation (RFA), a novel minimally invasive ablation method, in the treatment of CIP focusing on large symptomatic patches.

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Lenalidomide is an active agent for the treatment of MALT lymphoma. Recently, high expression levels of cereblon (CRBN) and MUM1 have been associated with better response rates in multiple myeloma treated with lenalidomide. However, there are no data on CRBN and MUM1 expression in MALT lymphoma.

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One of the aims of the Young Talent Group (YTG) is to make United European Gastroenterology (UEG) more attractive for young fellows interested in gastroenterology, and to involve them actively in UEG activities, by collaborating with young GI sections (YGIS) across Europe. Therefore, the YTG launched a survey to collect up-to-date information on YGISs belonging to UEG National Societies. The Friends of YTG were chosen as the target population and received a web-based questionnaire concerning their personal information, the structure of YGIS in their respective country, the YGIS' support mechanisms for young trainees, and ideas on how to improve them.

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These are the final results of the Ofatumumab in MALT lymphoma study (O-MA 1), a pilot phase II trial evaluating the capacity and safety of ofatumumab to induce objective responses in patients with Helicobacter pylori eradication refractory or extragastric MALT lymphoma. Ofatumumab was given at 4 weekly doses (1000 mg) followed by 4 doses at 2-month intervals starting at week 8. According to protocol, a total of 16 patients were recruited (median age 69 years; range 38-85).

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