Guido Grass
University of Cologne
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Guido Grass.
Histopathology | 2001
Stefan P. Mönig; Stephan Baldus; J. K. Hennecken; D B Spiecker; Guido Grass; Paul M. Schneider; Jürgen Thiele; H. P. Dienes; Arnulf H. Hölscher
Expression of MMP‐2 is associated with progression and lymph node metastasis of gastric carcinoma
British Journal of Pharmacology | 2000
Guenther Mathiak; Guido Grass; Thomas Herzmann; Thomas Luebke; Cecilia Cu Zetina; S. A. Boehm; Heribert Bohlen; Lewis F. Neville; Arnulf H. Hoelscher
The effect of acetyl–tyrosyl‐valyl‐alanyl‐aspartyl–chloromethylketone (ac‐YVAD‐cmk), an irreversible caspase‐1 (IL‐1β converting enzyme, ICE) inhibitor on mortality, leukocyte and platelet counts and cytokine levels was investigated in a double‐blind rat model of endotoxaemia. Intravenous (i.v.) bolus administration of lipopolysaccharide (LPS) (25–75 mg kg−1, n=12 per group) to anaesthetized rats induced a dose dependent increase in mortality over 8 h (LD50=48 mg kg−1). During this period, animals became leukopenic and thrombocytopenic. Serum levels of IL‐β, IL‐6, and TNF‐α were highly elevated. Pretreatment of rats with ac‐YVAD‐cmk at a dose of 12.5 μmol kg−1 significantly reduced mortality from 83 to 33% using Log Rank analysis. However, ac‐YVAD‐cmk did not modify blood cell counts or cytokine profiles as compared with the LPS‐drug vehicle group. These data lay credence to the potential importance of caspase‐1‐inhibition in modifying the inflammatory response to endotoxin. Further investigations are warranted in understanding the relationship between caspase‐1 inhibition, cytokine production and animal survival in different experimental paradigms of sepsis.
Annals of Surgery | 2004
Hartmut Schaefer; Andreas Engert; Guido Grass; Georg Mansmann; Gernot Wassmer; Kai Hübel; Dietrich Loehlein; Bernward C. Ulrich; Hans Lippert; Wolfram T. Knoefel; Arnulf H. Hoelscher
Objective:Esophagectomy for esophageal cancer is associated with substantial postoperative morbidity as a result of infectious complications. In a prior phase II study, granulocyte colony-stimulating factor (G-CSF) was shown to improve leukocyte function and to reduce infection rates after esophagectomy. The aim of the current randomized, placebo-controlled, multicenter phase III trial was to investigate the clinical efficacy of perioperative G-CSF administration in reducing infection and mortality after esophagectomy for esophageal cancer. Patients and Methods:One hundred fifty five patients with resectable esophageal cancer were randomly assigned to perioperative G-CSF at standard doses (77 patients) or placebo (76 patients), administered from 2 days before until day 7 after esophagectomy. The G-CSF and placebo groups were comparable as regards age, gender, risk, cancer stage, frequency of neoadjuvant radiochemotherapy, and type of esophagectomy (transthoracic or transhiatal esophageal resection). Results:Of 155 randomized patients, 153 were eligible for the intention-to-treat analysis. The rate of infection occurring within the first 10 days after esophagectomy was 43.4% (confidence interval 32.8–55.9%) in the placebo and 44.2% (confidence interval 32.1–55.3%) in the G-CSF group (P = 0.927). 30-day mortality amounted to 5.2% in the G-CSF group versus 5.3% in the placebo group (P = 0.985). Similar results were found in the per-protocol analysis. Conclusion:Perioperative administration of G-CSF failed to reduce postoperative morbidity, infection rate, or mortality in patients with esophageal cancer who underwent esophagectomy.
Cancer | 2010
Hakan Alakus; Arnulf H. Hölscher; Guido Grass; Eva Hartmann; Christian Schulte; Uta Drebber; Stephan Baldus; Elfriede Bollschweiler; Ralf Metzger; Stefan P. Mönig
Lymphatic spread is 1 of the most relevant prognostic factors for gastric carcinoma. The current International Union Against Cancer (UICC) pN staging system is based on the number of metastatic lymph nodes and does not take into consideration the characteristics of the metastatic lymph nodes itself. The aim of the current study was to examine the prognostic value of extracapsular lymph node involvement in gastric cancer and to find correlations with clinicopathological parameters.
Shock | 2001
G. Mathiak; L. F. Neville; Guido Grass; S. A. Boehm; Thomas Luebke; Thomas Herzmann; Koroush Kabir; Ralf Rosendahl; Ute Schaefer; Carola Mueller; Heribert Bohlen; Klaus Wassermann; Arnulf H. Hoelscher
Our objective was to investigate the levels of chemokines (MIP1-alpha, MCP-1, and Gro-alpha), Interleukin-18 (IL-18), and Interleukin (IL-6) in bronchoalveolar lavage (BAL) fluid and serum at the onset and ongoing states of sepsis as defined by the American College of Chest Physicians/Society of Critical Care Medicine in septic surgical ICU patients. Our summary background data was to understand the significance of compartmentalized inflammatory mediator production in an immunologically active organ (lung) in comparison with levels in the systemic circulation. The study group consisted of 20 septic patients and 10 non-septic patients on surgical ICU. At the onset of sepsis, both BAL fluid and serum samples were taken and levels of MIP-1alpha, MCP-1, GRO-alpha, IL-18, and IL-6 were measured by ELISA. Furthermore, over a subsequent 8-day period, levels of these mediators were determined in serum. In some experiments, IL-18 mRNA levels were determined in peripheral blood lymphocytes (PBL) of septic and non-septic patients. At the onset of sepsis, MIP-1alpha, MCP-1, GRO-alpha, IL-18, and IL-6 levels were significantly up-regulated in BAL fluid as compared with non-septic controls. In marked contrast, with the exception of IL-18 mRNA and IL-6 peptide, there was no increase in serum levels of inflammatory mediators determined both at the onset and during the ongoing states of sepsis. Based on the present data, monitoring levels of serum chemokines and IL-18 protein as markers of sepsis might be misleading since despite their non-detection in serum, they were highly up-regulated in the lung tissue compartment. These data might underscore the role of MIP-1alpha, MCP-1, GRO-alpha, and IL-18 in the mediation of local tissue damage. Furthermore, these findings raise the notion that mediator measurement in immunologically active organs might serve as pivotal indicators of sepsis prior to the actual fulfillment of specific clinical criteria that defines the patient as being septic.
Archive | 2009
Hakan Alakus; N. Afriani; Ute Warnecke-Eberz; Guido Grass; Christian Schulte; Elfriede Bollschweiler; Ralf Metzger; Arnulf H. Hölscher; Stefan P. Mönig
Introduction: Matrix metalloproteinases (MMPs) can degrade type IV collagen of extracellular matrices and basal membranes and thus play a key role in the migration of malignant cells. Aim of the present study was to investigate possible correlations of MMP and TIMP genotypes on gene expression, on clinicopathological parameters and on prognosis in gastric cancer. Methods: Genomic DNA was extracted from paraffin-embedded tissues of 135 patients who were treated surgically between May 1996 and January 2005 for primary gastric carcinoma. Allelic discrimination for MMP-2−1306C>T, TIMP-2303C>T and MMP-7−181A>G was performed by quantitative real-time PCR using two allele-specific TaqMan probes in competition for amplification of each gene. MMP-2 and TIMP-2 gene expression in resected tumor tissues was immunhistochemically detected. Genotyping was correlated with expression and with histopathologic parameters. Relations to overall survival were evaluated with univariate analysis according to the Kaplan-Meier approach (log-rank test). Results: The genotype distribution and allele frequencies of the SNPs were not significantly different from the control group. A significant correlation was seen for TIMP-2303C>T with a higher pN-stage (p=0.01) and pM-stage (p=0.02) for patients with CC genotype. 25 (96.2%) patients with pN3-stage had a TIMP-2303C>T CC-genotype, whereas the portion of patients with a CC-genotype in the other pN-stages was only between 71.4% for pN0 and 79.4% for pN1. The C-allele frequency for patients with distant metastasis (pM1) was 96.2% and 87.6% for patients without distant metastasis (pM0). No significant correlation could be found between the analyzed SNPs and the immunhistochemically detected protein levels of MMP-2 (p=0.766) and of TIMP-2 (p=0.684). In the univariate analyses non of the SNPs correlated with survival. Conclusion: In contrast to previous studies with low number of patients, survival in gastric cancer was not associated with the MMP-2−1306C>T and TIMP-2303C>T with expression of MMP-2 and TIMP-2 could be demonstrated. For the first time a significant correlation of TIMP-2303C>T with pN-and pM-category could be described in the present study.
Mmw-fortschritte Der Medizin | 2006
H. Lohmann; Guido Grass; W. Müller; C. Rangger; Mathiak G
ZusammenfassungNicht dislozierte unkomplizierte Brüche ohne Gelenkbeteiligung können zum Teil konservativ versorgt werden. Doch der Vorteil einer operativen Behandlung nach einer Fraktur ist, dass der Patient nicht wochenlang mit dem Gips liegt, sondern ohne äußere Fixation rasch wieder mobil ist. Gerade bei älteren Patienten lassen sich so das Thromboembolie risiko und der Pflegeaufwand erheblich reduzieren.
Mmw-fortschritte Der Medizin | 2006
H. Lohmann; Guido Grass; W. Müller; C. Rangger; Mathiak G
The initial care of a fractured bone provided by the general physician includes reduction followed by immobilization and the treatment of pain. Open fractures must be covered by a sterile dressing, prior to the transportation of the patient to a hospital. Depending upon the severity of the injury, further treatment is provided by an orthopedic surgeon or in an appropriate hospital.ZusammenfassungDie Erstversorgung eines Bruches übernimmt meist der Hausarzt. Danach muss er abwägen, ob er den Patienten zu einem niedergelassenen Unfallchirurgen überweisen oder gleich ins Krankenhaus schicken soll. Unsere Autoren haben für Sie die typischen Frakturzeichen, ein Diagnoseschema sowie die wichtigsten Punkte bei der Erstversorgung eines Patienten mit einer Extremitätenfraktur zusammengefasst.
Zentralblatt Fur Chirurgie | 2002
M. Korenkov; Stefan Sauerland; Nedim Yücel; Guido Grass; E. Neugebauer; Hans Troidl
Einleitung: Die stationare Osophagusdurchzugsmanometrie hat sich inzwischen als Standard in der Diagnostik von Osophagusfunktionsstorungen etabliert. Jedoch ist die Bedeutung der einzelnen Komponenten des Manometrieprotokolls fur die Wahl der OP-Methode bei gastroosophagealer Refluxkrankheit (GERD) nicht adaquat untersucht. Ziel dieser Studie war die Evaluierung des Einflusses der verschiedenen Parameter der Osophagusmanometrie auf die chirurgischen Strategie bei GERD. Patienten und Methoden: Von Januar 1995 bis Januar 2000 wurden 123 konsekutiv zugewiesene GERD-Patienten untersucht. 97 dieser Patienten (52 Frauen und 45 Manner, mittleres Alter 48 Jahre) wurden mit einer Fundoplikatio nach Nissen in konventioneller oder laparoskopischer Technik versorgt. Praoperativ wurden bei jedem Patienten eine stationare Osophagusdurchzugsmanometrie mit Wasserperfusionskatheter, sowie Gastroduodenoskopie und 24 h-osophagus-pH-Metrie standardmasig durchgefuhrt. Unabhangig von den Ergebnissen der Osophagusmanometrie erhielt jeder Patient eine 360°-Fundoplikatio mit 2 cm langer Manschette („floppy-Nissen“). Ergebnisse: Praoperativ wiesen 85 der 97 Patienten (88%) eine Inkompetenz des unteren osophagussphinkters auf. Bei 17 (18%) Patienten wurde eine Osophagushypomotilitat diagnostiziert. Bei 2 bzw. 1 nicht operierten Patienten wurde eine amotile Achalasie bzw. ein diffuser Osophagusspasmus festgestellt. Postoperativ wurden 92% der Patienten nachuntersucht (mittlere Nachuntersuchungszeit 1,8 Jahren). 5 bzw. 8 Patienten (1 bzw. 2 davon hypomotil) entwickelten postoperativ eine persistierende Dysphagie bzw. ein Rezidiv (Relatives Risiko 1,2 bzw. 1,6). Zwei Patienten (einer hypomotil) wurden reoperiert. Schlussfolgerungen: Die praoperative Osophagusmanometrie bei GERD kann auf die Bestimmung der oberen Grenze des unteren Osophagussphinkters, sowie den Ausschluss spezieller Osophagusmotilitatsstorungen eingeschrankt werden. Die „floppy-Nissen“ Fundoplikatio kann ohne zusatzliches Dysphagierisiko bei Patienten mit hypomotilem Osophagus angewandt werden.
Archive | 2002
Stefan P. Mönig; Stephan Baldus; J. K. Hennecken; S. Nolden; Guido Grass; Arnulf H. Hölscher
Einleitung: Ziel unserer prospektiven Studie war die Evaluation der p53- und MMP-2 Immunreaktivitat in Magenkarzinomen sowie deren Korrelation zur Tumorprogression und insbesondere zur Lymphknotenmetastasierung. Methode: Die vorliegende immunhistochemische Studie analysiert den MMP-2 Status der Resektionspraparate von 115 Patienten (mean Alter 64 Jahre; Bereich: 33 — 86) mit primarem Magenkarzinom nach D2-Gastrektomie. Die immunhistochemische Analyse an Paraffinschnitten erfolgte fur p53 nach der Immunomax-Methode und fur MMP-2 nach der ABC-Methode. Die Auswertung erfolgte semiquantitativ. Alle Tumore wurden gemas der UICC-, WHO-, Lauren-, Ming- und Goseki-Klassifikation eingeodnet. Ergebnisse: Eine positive Immunreaktivitat fur MMP-2 konnte in 94 (81,7%) Tumorresektaten nachgewiesen werden. 21 Praparate (18,3%) zeigten keine MMP-2 Expression. Zwischen der MMP-2 Expression und anderen Faktoren wie dem Alter, der Tumordifferenzierung, der WHO-, der Lauren-, der Goseki-, und der Ming-Klassifikation konnte keine Korrelation gefunden werden. Im Gegensatz hierzu zeigte die MMP-2 Expression eine signifikante Korrelation zur Tumorinfiltration (T-Stadium), zur Lymphknotenmetastasierung (N-Stadium), zur Fernmetastasierung (M-Stadium) und zum UICC-Stadium. Eine Uberexpression (Anfarbung > 20%) von p53 zeigte sich in 80,7% der untersuchten Tumore. Die p53 Immunreaktivitat korrelierte dabei signifikant mit dem T- und dem N-Status sowie mit dem UICC-Stadium. Schlusfolgerungen: Die Expression von p53 und MMP-2 in Magenkarzinomen zeigt eine signifikante Korrelation zur Tumorprogression und insbesondere zur Lymphknotenmetastasierung. Die immunhistochemische Analyse von p53 und MMP-2 konnte daher in Kombination mit klinischen Parametern von klinischer Relevanz fur die Pradiktion der Tumorprogression und der Lymphknotenmetastasierung sein.