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Dive into the research topics where Bita Boozari is active.

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Featured researches published by Bita Boozari.


Journal of Clinical Investigation | 2011

Virus-induced tumor inflammation facilitates effective DC cancer immunotherapy in a Treg-dependent manner in mice

Norman Woller; Sarah Knocke; Bettina Mundt; Engin Gürlevik; Nina Strüver; Arnold Kloos; Bita Boozari; Peter Schache; Michael P. Manns; Nisar P. Malek; Tim Sparwasser; Lars Zender; Thomas Wirth; Stefan Kubicka; Florian Kühnel

Vaccination using DCs pulsed with tumor lysates or specific tumor-associated peptides has so far yielded limited clinical success for cancer treatment, due mainly to the low immunogenicity of tumor-associated antigens. In this study, we have identified intratumoral virus-induced inflammation as a precondition for effective antitumor DC vaccination in mice. Administration of a tumor-targeted DC vaccine during ongoing virus-induced tumor inflammation, a regimen referred to as oncolysis-assisted DC vaccination (ODC), elicited potent antitumoral CD8+ T cell responses. This potent effect was not replicated by TLR activation outside the context of viral infection. ODC-elicited immune responses mediated marked tumor regression and successful eradication of preestablished lung colonies, an essential prerequisite for potentially treating metastatic cancers. Unexpectedly, depletion of Tregs during ODC did not enhance therapeutic efficacy; rather, it abrogated antitumor cytotoxicity. This phenomenon could be attributed to a compensatory induction of myeloid-derived suppressor cells in Treg-depleted and thus vigorously inflamed tumors, which prevented ODC-mediated immune responses. Consequently, Tregs are not only general suppressors of immune responses, but are essential for the therapeutic success of multimodal and temporally fine-adjusted vaccination strategies. Our results highlight tumor-targeting, replication-competent viruses as attractive tools for eliciting effective antitumor responses upon DC vaccination.


Hepatitis Monthly | 2013

Diagnostic Value of Ultrasound in Detection of Biliary Tract Complications After Liver Transplantation

Andrej Potthoff; Anreas Hahn; Stefan Kubicka; Andrea L.C. Schneider; Jochen Wedemeyer; J. Klempnauer; Michael P. Manns; M. Gebel; Bita Boozari

Background Biliary complications are significant source of morbidity after liver transplantation (LT). Cholangiography is the gold standard for diagnosis and specification of biliary complications. Objectives Detailed analyses of ultrasound (US) as a safe imaging method in this regard are still lacking. Therefore we analyzed systematically the diagnostic value of US in these patients. Patients and Methods Retrospectively, 128 liver graft recipients and their clinical data were analyzed. All patients had a standardized US examination. The findings of US were compared to cholangiographic results in 42 patients. Following statistical analyses were performed: descriptive statistics, sensitivity, specificity, positive and negative predictive values (PPV, NPV). Results 42 patients had 54 different biliary complications (Anastomotic stenosis (AS) n = 33, ischemic type biliary lesions (ITBL) n = 18 and leakage n = 3). US detected n = 22/42 (52%) patients with biliary complications. The sensitivity, specificity, PPV and NPV of US were: 61%, 100%, 100%, 79% (95CI, 36-86%) for ITBL and 24%, 100, 100%, 31% (95CI, 9-46 %) for AS, respectively. Conclusions US examination had no false positive rate. Therefore, it may be helpful as a first screening modality. But for the direct diagnosis of the biliary complication US is not sensitive enough.


Journal of Ultrasound in Medicine | 2010

Evaluation of Sound Speed for Detection of Liver Fibrosis Prospective Comparison With Transient Dynamic Elastography and Histology

Bita Boozari; Andrej Potthoff; Ingmar Mederacke; Andreas Hahn; Ansgar Reising; Kinan Rifai; Heiner Wedemeyer; Matthias J. Bahr; Stefan Kubicka; Michael P. Manns; M. Gebel

Objective. The degree of liver fibrosis determines the prognosis and treatment of patients with chronic viral hepatitis. Transient elastography (TE) has been accepted as a noninvasive method for assessment of liver fibrosis. Sound velocity (SV) changes are also dependent on elastic properties of tissue. The aim of this pilot study was to evaluate whether SV estimation of liver tissue allows the determination of fibrosis stages in patients with chronic viral hepatitis. Methods. Prospectively, 50 healthy volunteers and 149 patients received stiffness (TE, 50‐Hz vibrator, 5‐MHz array) and SV (conventional ultrasound, C5–2‐MHz transducer) measurements. Eighty‐four patients received representative liver biopsies. The estimated SV and stiffness were compared using liver biopsy as a reference (METAVIR fibrosis stage [F] scoring system [Hepatology 1996; 24:289–293]). Descriptive statistics, analysis of variance, receiver operating characteristic curve analysis, and box plot analysis as well as intra‐operator and interoperator reproducibility analyses were performed. Results. The SV ranged from 1540 to 1650 m/s. The mean SV ± SD was significantly different between healthy volunteers (1559 ± 11 m/s) and patients with F0–F3 (1575 ± 21 mm/s) and F4 (1594 ± 18 m/s) disease (P < .001). For detection of liver cirrhosis, the area under the receiver operating characteristic curve for SV was 0.80 (95% confidence interval, 0.69–0.89). With a cutoff value of 1589 m/s, the sensitivity, specificity, and positive and negative predictive values of SV for detection of liver cirrhosis were 82%, 76%, 70%, and 86%, respectively. Sound velocity measurements were reproducible (15%) and had acceptable operator independence (19%). Conclusions. The SV of liver tissue depends on the fibrosis stage. An SV of 1589 m/s or higher detects cirrhosis with high sensitivity. Therefore, SV measurement appears to be a promising new method for noninvasive quantification of liver fibrosis.


Zeitschrift Fur Gastroenterologie | 2011

Peripapillary duodenal varices as a rare cause of severe bleeding in a patient with no other signs of portal hypertension--successful endoscopic treatment with cyanoacrylate injection.

T. J. Weismüller; N. Schweitzer; Bita Boozari; A. Negm; D. Bürger; Michael P. Manns; J. Wedemeyer; Stefan Kubicka

Duodenal varices (DVs) are a rare cause of upper gastrointestinal bleeding and rather suspected in patients with portal hypertension. Bleeding DVs are difficult to manage and often fatal due to delayed diagnosis. We report on a 71-year-old patient with massive upper gastrointestinal haemorrhage, who did not show any clinical signs of portal hypertension; however, he had a history of duodenal segmental resection 8 years before. The source of bleeding could not be detected with different imaging methods such as angiography and computed tomography. Upper gastrointestinal endoscopy finally revealed DVs, which were located just adjacent to the papilla. After endoscopic injection therapy with n-butyl 2-cyanoacrylate the bleeding stopped immediately and the patient soon stabilised. Despite the peripapillar localisation no signs of pancreatitis or cholestasis occurred; during 10-month follow-up a marked regression of the varices without further signs of variceal bleeding was observed.


Zeitschrift Fur Gastroenterologie | 2017

The impact of high-end ultrasound in the management of a patient with neuroendocrine tumor of the ileum

Tatjana Schmidt; Julia M. Schwarz; Martina Steurer; Martin Goetz; Susann-Cathrin Olthof; Nisar P. Malek; Bita Boozari

Diagnostic imaging of jejuno-ileal neuroendocrine tumors (NETs) has been described as challenging. Follow-up requires the detection of metastatic spread as well as screening for local recurrence. Multimodal imaging concepts must often be applied.We report the case of a 45-year-old man with a history of ileal NET. At 2 points in follow-up of our patient, information provided by high-end ultrasound changed prognosis and treatment considerably: when positron emission tomography/computed tomography newly detected suspected hepatic metastases, contrast-enhanced ultrasound correctly identified the lesions as intrahepatic vascular shunts. Moreover, profound B-mode ultrasound solely detected ileal recurrence, leading to early removal of the tumor.


Ultraschall in Der Medizin | 2008

Nicht-parasitäre Milzzysten: Ultraschallgesteuerte Zystensklerosierung

D. Berger; Bita Boozari; K Rifai; Michael P. Manns; M. Gebel

Hintergrund: Nicht-parasitare Zysten der Milz sind eine seltene Erkrankung beim Menschen. Der haufigere Einsatz von Ultraschall bei abdominellen Erkrankungen fuhrt dazu, dass Milzzysten einfacher und haufiger diagnostiziert werden. Die meisten nicht-parasitaren Zysten werden nie symptomatisch und bedurfen daher auch keiner Therapie. Nur Milzzysten, die eine Symptomatik entwickeln sollten einer Behandlung zugefuhrt werden. Die Standardtherapie fur nicht-parasitare Zysten ist eine chirurgische Vorgehensweise mit totaler oder subtotaler Splenektomie. In den letzten Jahren wurde auch laparoskopische Verfahren entwickelt und vermehrt eingesetzt. Methoden and Studien-Design: Wir evaluierten 10 Patienten im Alter zwischen 14 und 60 Jahre (7 weiblichen Patientinnen und 3mannliche Patienten); alle Patienten hatten symptomatische nicht-parasitaren Zyste der Milz. Das Blutbild vor Therapie lag innerhalb des Normbereiches. Die Spiegel fur das C-reaktive- Protein (CRP) als Marker fur eine systemische Infektion und/oder Entzundung war bei fast allen Patienten nicht erhoht. Ein Patient hatte eine leichte Erhohung des CRPs auf 16mg/l [Norm: <8mg/l]. Nach stationarer Aufnahme des Patienten wurde eine schriftliche Einverstandniserklarung eingeholt. Durch die Verwendung einer Ultraschall-gesteuerten Methoden zur Punktion der Milzzyste wurde gewahrleistet, dass eine sichere und direkte Punktion der Zyste (AK Blunt, PAJUNK) moglich war. Nach Ablassen des flussigen zystische Inhaltes wurde Polidocanol 1% (Aethoxysklerol 1%) oder 10% der Natriumchlorid-Losung in das Lumen der Zysten eingespritzt und verblieb dort. Ergebnisse: Das gesamte Verfahren wurde von allen Patienten gut vertragen, und bis auf milde Schmerzen im Bereich der Interventionsstelle traten keine weiteren Komplikationen insbesondere keine interventionsbedurftigen Blutungen auf. Die Hamoglobin- und Thrombozytenspiegel fielen von 13,1g/dl auf 11,8g/dl bzw. 235 Tsd/ul auf 205 Tsd/ul ab. Dieser Abfall war signifikant. Die Spiegel fur das CRP stiegen signifikant an auf durchschnittliche Werte von 110mg/l (Bereich: zwischen 1 bis 264mg/l) an. Eine bakterielle Infektion wurde nur in 1 der 10 Patienten diagnostiziert. Hier entwickelte sich eine Infektion der Zyste mit Koagulase-negativen Staphylokokken und eine lokale und systemische Antibiotikatherapie war erforderlich. Alle anderen Zystenflussigkeiten waren in der mikrobiologischen Untersuchung steril. In 70% der Patienten mussten wir 1 bis 2 Tage nach der Zystensklerosierung eine zweite Punktion und Drainage/Abpunktieren von zystischer Flussigkeit durchfuhren. Nach einem Beobachtungszeitraum zwischen 3 bis 36 Monate fanden wir einen signifikanten Ruckgang der Zystengrose von zunachst 90,4mm mal 76,3mm auf 48,3 mal 34,3mm. Je langer der Zeitraum Beobachtungen desto kleiner wurde die verbliebene Zyste. Bei einem Patienten, bei dem wir 10% Natrium-Chlorid-Losung zur Sklerosierung benutzt haben war die Milzzyste komplett verschwunden. Schlussfolgerung: Sklerosierung von nicht parasitare Milzzysten mithilfe eines Ultraschall-gesteuerten Punktion ist ein sicheres, Milz erhaltendes und kostengunstiges Therapieverfahren zur Behandlung einer nicht-parasitaren Milzzyste. Der Anstieg des CRPs ist unserer Meinung nach eine Antwort auf eine systematische inflammatorische Reaktion auf die Verwendung von Polidocanol 1%. Die beiden Patienten, die wir mit 10% Natrium-Chlorid anstatt Polidocanol 1% behandelt haben, zeigten keine Anzeichen fur diese inflammatorsiche Reaktion. Daher konnte postuliert werden, dass die Gabe von 10% Natrium-Chlorid-Losung einer Gabe von Polidocanol 1% sogar uberlegen erscheint. Um dies zu bestatigen, sollten weitere Untersuchungen zu diesem Verfahren angestrebt werden. Zusammenfassend denken wir, dass die hier aufgezeigte Methode eine sichere und gut vertragliche Behandlungsoption bei Patienten mit nicht-parasitare Zysten ist und sie sollten bei allen geeigneten Patienten einer offenen oder laparoskopischen Operation vorgezogen werden. Keywords: nicht-parasitare Milzzyste, Sklerosierung, Sklerosierungstherapie, ultraschallgesteuerte Punktion, Polidocanol1%, Natriumchlorid 10%,


Journal of Hepatology | 2008

Ultrasonography in patients with Budd–Chiari syndrome – Diagnostic signs and prognostic implications

Bita Boozari; Matthias J. Bahr; Stefan Kubicka; J. Klempnauer; Michael P. Manns; M. Gebel


Gut | 2010

Antitumoural immunity by virus-mediated immunogenic apoptosis inhibits metastatic growth of hepatocellular carcinoma

Bita Boozari; Bettina Mundt; Norman Woller; Nina Strüver; Engin Gürlevik; Peter Schache; Arnold Kloos; Sarah Knocke; Michael P. Manns; Thomas Wirth; Stefan Kubicka; Florian Kühnel


Transplant International | 2002

Recurrence of Budd–Chiari syndrome after liver transplantation in paroxysmal nocturnal hemoglobinuria

Matthias J. Bahr; Jörg Schubert; Bleck Js; Uwe J. F. Tietge; Bita Boozari; Reinhold E. Schmidt; Jürgen Klempnauer; Christian P. Strassburg; Michael P. Manns


Journal of Hepatology | 2009

217 ACOUSTIC RADIATION FORCE IMAGING (ARFI) AS A NEW METHOD OF ULTRASONOGRAPHIC ELASTOGRAPHY ALLOWS ACCURATE AND FLEXIBLE ASSESSMENT OF LIVER STIFFNESS

Kinan Rifai; Matthias J. Bahr; Ingmar Mederacke; Heike Bantel; D. Bayer; Bita Boozari; H. Wedemeyer; Michael P. Manns; M. Gebel

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M. Gebel

Hannover Medical School

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Kinan Rifai

Hannover Medical School

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