76
|
Sennoun N, Toussaint-Hacquard M, Lecomte A, Chevreux L, Lecompte T, Gross S, Levy B. Le plasma « médicament » de la dysfonction cardiovasculaire observée au cours du choc hémorragique chez le rat. Étude financée par APR 2011 EFS. Transfus Clin Biol 2013. [DOI: 10.1016/j.tracli.2013.03.177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
77
|
Belcour B, Koessler A, Gross S. Amélioration du dosage des protéines totales dans les PSL. Transfus Clin Biol 2013. [DOI: 10.1016/j.tracli.2013.03.133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
78
|
Toussaint-Hacquard M, Coppo P, Soudant M, Chevreux L, Mathieu-Nafissi S, Malot S, Lecompte T, Gross S, Guillemin F, Schneider T. Impact du type de plasma utilisé sur l’évolution clinique des patients atteints de purpura thrombotique thrombocytopénique – Cohorte multicentrique nationale du Centre national de référence des microangiopathies thrombotiques (CNR-MAT) de 2005 à 2010. Transfus Clin Biol 2013. [DOI: 10.1016/j.tracli.2013.04.105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
79
|
Wang H, Gross S. Positive predictive value of Carnett’s sign in differential diagnosis of chronic abdominal pain: a retrospective cohort study. THE JOURNAL OF PAIN 2013. [DOI: 10.1016/j.jpain.2013.01.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
80
|
Funk MB, Gross N, Gross S, Hunfeld A, Lohmann A, Guenay S, Hanschmann KM, Keller-Stanislawski B. Thromboembolic events associated with immunoglobulin treatment. Vox Sang 2013; 105:54-64. [DOI: 10.1111/vox.12025] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Revised: 12/10/2012] [Accepted: 12/13/2012] [Indexed: 11/26/2022]
|
81
|
Gross S, Andrä J. Anticancer peptide NK-2 targets cell surface sulphated glycans rather than sialic acids. Biol Chem 2013; 393:817-27. [PMID: 22944683 DOI: 10.1515/hsz-2012-0136] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Accepted: 06/27/2012] [Indexed: 11/15/2022]
Abstract
Some antimicrobial peptides have emerged as potential anticancer agents. In contrast to chemotherapeutics, they act primarily by physical disruption of the cancer cell membrane. Selective targeting of these cationic peptides still remains elusive. We focus on the interaction of α-helical peptides NK-2, cathelicidin LL32, and melittin with PC-3 prostate cancer cells, and we provide strong evidence that, amongst the anionic glycans covering the cell surface, sulphated carbohydrates rather than sialic acids are the preferred interaction sites of the peptides. To test the significance of cell surface carbohydrates, a glycan microarray screen with fluorescently labelled peptides has been performed. Amongst 465 mammalian glycan structures on the chip, more than 20 different sulphated glycans were detected as the preferred binding partners of the peptide NK-2. The amount of peptide bound to sialic acid containing oligosaccharides was close to background level. These findings were consistent with microcalorimetric experiments revealing high and low binding enthalpies of peptides to sulphated carbohydrates and to sialic acid, respectively. Enzymatic desialylation of PC-3 cells did not affect peptide-mediated changes in cell metabolism, cell membrane permeabilisation, killing rate, and kinetics. Finally, the cytotoxicity of all peptides could be drastically impaired through the competitive inhibition by chondroitin sulphate, but not by sialic acid and sialylated fetuin.
Collapse
|
82
|
Lancaster DG, Gross S, Fuerbach A, Heidepriem HE, Monro TM, Withford MJ. Versatile large-mode-area femtosecond laser-written Tm:ZBLAN glass chip lasers. OPTICS EXPRESS 2012; 20:27503-27509. [PMID: 23262700 DOI: 10.1364/oe.20.027503] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report performance characteristics of a thulium doped ZBLAN waveguide laser that supports the largest fundamental modes reported in a rare-earth doped planar waveguide laser (to the best of our knowledge). The high mode quality of waveguides up to 45 um diameter (~1075 μm(2) mode-field area) is validated by a measured beam quality of M(2)~1.1 ± 0.1. Benefits of these large mode-areas are demonstrated by achieving 1.9 kW peak-power output Q-switched pulses. The 1.89 μm free-running cw laser produces 205 mW and achieves a 67% internal slope efficiency corresponding to a quantum efficiency of 161%. The 9 mm long planar chip developed for concept demonstration is rapidly fabricated by single-step optical processing, contains 15 depressed-cladding waveguides, and can operate in semi-monolithic or external cavity laser configurations.
Collapse
|
83
|
Riad A, Weitmann K, Herda LR, Empen K, Gross S, Nauck M, Dörr M, Klingel K, Kandolf R, Hoffmann W, Felix SB. Initial white blood cell count is an independent risk factor for survival in patients with dilated cardiomyopathy. Int J Cardiol 2012. [PMID: 23200269 DOI: 10.1016/j.ijcard.2012.11.061] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
BACKGROUND The impact of white blood cell count (WBCc) on the outcome of patients with non-ischemic left ventricular (LV) dysfunction is unknown. In the present study we investigated the influence of WBCc on mortality and cardiac inflammation in patients with reduced LV systolic function in the absence of ischemic or valvular etiology. METHODS AND RESULTS We included 381 patients with reduced left ventricular (LV) ejection fraction (LVEF ≤ 45%) quantified by two-dimensional echocardiography. Coronary artery disease and valvular diseases were excluded by angiography and echo, respectively, in all patients. WBCc was quantified routinely upon first hospital admission. In 291 patients, endomyocardial biopsies from the right ventricle were performed upon first hospital admission for assessment of cardiac inflammation. Follow-up was up to 5.5 years (median 2.93 [1.7;4.0]). Information on vital status of patients was obtained from official resident data files. WBCc >11 Gpt/l was associated with significantly increased mortality in patients with severe LV dilation (end-diastolic diameter (LVEDD) >70 mm quantified by echocardiography) in comparison to patients showing WBCc ≤ 11 Gpt/l (41.7% vs 13.6%, p=0.02). Multivariable Cox regression analysis showed that WBCc predicts mortality independently of other cardiovascular risk factors and LVEF (hazard ratio 1.14; p=0.04). Doses of heart failure medication did not differ significantly in patients with LVEDD >70 mm and WBCc >11 Gpt/l when compared to LVEDD >70 mm and WBCc ≤ 11 Gpt/l (percent of maximum doses: ß-blockers p=0.51, ACE inhibitors p=0.56, AT1 antagonists p=0.77, aldosterone antagonists p=0.35). WBCc including its subpopulations (monocytes, lymphocytes and granulocytes) did not show a significant correlation with cardiac amounts of CD3(+)-lymphocytes (r=0.02, p=0.78) or CD68(+)-macrophages (r=1.0, p=0.09) (n=291). CONCLUSION WBCc at first hospital admission predicts long term-mortality in patients with dilated cardiomyopathy independently of cardiovascular risk factors.
Collapse
|
84
|
André-Botté C, Tinard X, Émilie H, Schuhmacher A, Gross S. Vigilance lors des suivis immunohématologiques de grossesses. Transfus Clin Biol 2012. [DOI: 10.1016/j.tracli.2012.08.075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
85
|
Guillerm V, Ragon F, Dan-Hardi M, Devic T, Vishnuvarthan M, Campo B, Vimont A, Clet G, Yang Q, Maurin G, Férey G, Vittadini A, Gross S, Serre C. Innentitelbild: A Series of Isoreticular, Highly Stable, Porous Zirconium Oxide Based Metal-Organic Frameworks (Angew. Chem. 37/2012). Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201206021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
86
|
Guillerm V, Ragon F, Dan-Hardi M, Devic T, Vishnuvarthan M, Campo B, Vimont A, Clet G, Yang Q, Maurin G, Férey G, Vittadini A, Gross S, Serre C. Inside Cover: A Series of Isoreticular, Highly Stable, Porous Zirconium Oxide Based Metal-Organic Frameworks (Angew. Chem. Int. Ed. 37/2012). Angew Chem Int Ed Engl 2012. [DOI: 10.1002/anie.201206021] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
87
|
Guillerm V, Ragon F, Dan-Hardi M, Devic T, Vishnuvarthan M, Campo B, Vimont A, Clet G, Yang Q, Maurin G, Férey G, Vittadini A, Gross S, Serre C. A Series of Isoreticular, Highly Stable, Porous Zirconium Oxide Based Metal-Organic Frameworks. Angew Chem Int Ed Engl 2012; 51:9267-71. [DOI: 10.1002/anie.201204806] [Citation(s) in RCA: 369] [Impact Index Per Article: 30.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2012] [Indexed: 11/11/2022]
|
88
|
Guillerm V, Ragon F, Dan-Hardi M, Devic T, Vishnuvarthan M, Campo B, Vimont A, Clet G, Yang Q, Maurin G, Férey G, Vittadini A, Gross S, Serre C. A Series of Isoreticular, Highly Stable, Porous Zirconium Oxide Based Metal-Organic Frameworks. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201204806] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
89
|
Martens HA, Nienhuis HLA, Gross S, van der Steege G, Brouwer E, Berden JHM, de Sévaux RGL, Derksen RHWM, Voskuyl AE, Berger SP, Navis GJ, Nolte IM, Kallenberg CGM, Bijl M. Receptor for advanced glycation end products (RAGE) polymorphisms are associated with systemic lupus erythematosus and disease severity in lupus nephritis. Lupus 2012; 21:959-68. [PMID: 22513366 DOI: 10.1177/0961203312444495] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Interaction of advanced glycation end products (AGEs) with their receptors (RAGE) plays an important role in inflammation in auto-immune diseases. Several functional polymorphisms of RAGE have been described. In this study we analysed the role of RAGE polymorphisms in disease susceptibility for systemic lupus erythematosus (SLE). In addition, we investigated whether these polymorphisms in SLE are associated with serum levels of soluble RAGE (sRAGE), renal involvement (lupus nephritis (LN)) and its outcome. METHODS For this cross-sectional study DNA samples of 97 SLE patients, 114 LN patients and 429 healthy controls (HC) were genotyped for four RAGE polymorphisms: -429 T/C, -374 T/A, 2184 A/G and Gly82Ser. Differences in genotype frequencies and allele frequencies were tested between patients and HCs. In SLE patients, sRAGE was measured by enzyme-linked immunosorbent assay (ELISA). In addition, association of genotypes with sRAGE and disease severity in LN was analysed. RESULTS The C allele of -429 T/C, the T allele of -374 T/A and the G allele of 2184 A/G were significantly more prevalent in SLE and LN compared with HC. In LN, the C allele of RAGE -429 T/C, the A allele of -374 T/A and the G allele of RAGE 2184 A/G polymorphism were significantly associated with more proteinuria and worse renal function during the first two years of treatment. No association of genotype with sRAGE was found. CONCLUSION RAGE polymorphisms are associated with susceptibility to SLE and LN. In addition, some of these polymorphisms are likely to be associated with disease severity and initial response to treatment in LN.
Collapse
|
90
|
Lancaster DG, Gross S, Ebendorff-Heidepriem H, Fuerbach A, Withford MJ, Monro TM. 2.1 μm waveguide laser fabricated by femtosecond laser direct-writing in Ho3+, Tm3+:ZBLAN glass. OPTICS LETTERS 2012; 37:996-998. [PMID: 22446202 DOI: 10.1364/ol.37.000996] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We report the first Ho3+ doped waveguide laser, which was realized by femtosecond direct-writing of a depressed cladding structure into ZBLAN glass. Tm3+ sensitizing allows the 9 mm long Ho3+ gain medium to be conveniently pumped at 790 nm, achieving an optical-to-optical slope efficiency of 20% and a threshold of 20 mW. The potentially widely tunable laser produces up to 76 mW at 2052 nm and also operates at shorter wavelengths near 1880 nm and 1978 nm for certain cavity configurations.
Collapse
|
91
|
Diodati S, Nodari L, Natile MM, Russo U, Tondello E, Lutterotti L, Gross S. Highly crystalline strontium ferrites SrFeO3−δ: an easy and effective wet-chemistry synthesis. Dalton Trans 2012; 41:5517-25. [DOI: 10.1039/c2dt11916a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
92
|
Medoro G, Gross S, Manaresi N, Sergio M, Fontana F, Gianni S, Calanca A, Peruzzi E, Banzi M, Signorini G, Rao C, Patel J, Karkera J, Giorgini G, Mata M, Connelly MC. Use of the DEPArray platform to detect, isolate, and molecularly characterize pure tumor cells from peripheral blood samples enriched using the CellSearch system. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.10616] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
93
|
Gross S, Lennerz V, Gallerani E, Sessa C, Mach N, Boehm S, Hess D, von Boehmer L, Knuth A, Ochsenbein A, Gnad-Vogt U, Zieschang J, Forssmann U, Woelfel T, Kaempgen E. First-in-human trial focusing on the immunologic effects of the survivin-derived multiepitope vaccine EMD640744. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.2515] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
94
|
Etscheid M, Breitner-Ruddock S, Gross S, Hunfeld A, Seitz R, Dodt J. Identification of kallikrein and FXIa as impurities in therapeutic immunoglobulins: implications for the safety and control of intravenous blood products. Vox Sang 2011; 102:40-6. [DOI: 10.1111/j.1423-0410.2011.01502.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
95
|
Lancaster DG, Gross S, Ebendorff-Heidepriem H, Kuan K, Monro TM, Ams M, Fuerbach A, Withford MJ. Fifty percent internal slope efficiency femtosecond direct-written Tm³⁺:ZBLAN waveguide laser. OPTICS LETTERS 2011; 36:1587-9. [PMID: 21540936 DOI: 10.1364/ol.36.001587] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We report a 790 nm pumped, Tm³⁺ doped ZBLAN glass buried waveguide laser that produces 47 mW at 1880 nm, with a 50% internal slope efficiency and an M² of 1.7. The waveguide cladding is defined by two overlapping rings created by femtosecond direct-writing of the glass, which results in the formation of a tubular depressed-index-cladding structure, and the laser resonator is defined by external dielectric mirrors. This is, to the best of our knowledge, the most efficient laser created in a glass host via femtosecond waveguide writing.
Collapse
|
96
|
Moehler M, Al-Batran SE, Andus T, Anthuber M, Arends J, Arnold D, Aust D, Baier P, Baretton G, Bernhardt J, Boeing H, Böhle E, Bokemeyer C, Bornschein J, Budach W, Burmester E, Caca K, Diemer WA, Dietrich CF, Ebert M, Eickhoff A, Ell C, Fahlke J, Feussner H, Fietkau R, Fischbach W, Fleig W, Flentje M, Gabbert HE, Galle PR, Geissler M, Gockel I, Graeven U, Grenacher L, Gross S, Hartmann JT, Heike M, Heinemann V, Herbst B, Herrmann T, Höcht S, Hofheinz RD, Höfler H, Höhler T, Hölscher AH, Horneber M, Hübner J, Izbicki JR, Jakobs R, Jenssen C, Kanzler S, Keller M, Kiesslich R, Klautke G, Körber J, Krause BJ, Kuhn C, Kullmann F, Lang H, Link H, Lordick F, Ludwig K, Lutz M, Mahlberg R, Malfertheiner P, Merkel S, Messmann H, Meyer HJ, Mönig S, Piso P, Pistorius S, Porschen R, Rabenstein T, Reichardt P, Ridwelski K, Röcken C, Roetzer I, Rohr P, Schepp W, Schlag PM, Schmid RM, Schmidberger H, Schmiegel WH, Schmoll HJ, Schuch G, Schuhmacher C, Schütte K, Schwenk W, Selgrad M, Sendler A, Seraphin J, Seufferlein T, Stahl M, Stein H, Stoll C, Stuschke M, Tannapfel A, Tholen R, Thuss-Patience P, Treml K, Vanhoefer U, Vieth M, Vogelsang H, Wagner D, Wedding U, Weimann A, Wilke H, Wittekind C. [German S3-guideline "Diagnosis and treatment of esophagogastric cancer"]. ZEITSCHRIFT FUR GASTROENTEROLOGIE 2011; 49:461-531. [PMID: 21476183 DOI: 10.1055/s-0031-1273201] [Citation(s) in RCA: 151] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
97
|
Horsthemke B, Wawrzik M, Gross S, Lich C, Sauer B, Rost I, Krasemann E, Kosyakova N, Liehr T, Weise A, Dybowski JN, Hoffmann D, Wieczorek D. Parental origin and functional relevance of a de novo UBE3A variant. Eur J Med Genet 2010; 54:19-24. [PMID: 20933619 DOI: 10.1016/j.ejmg.2010.09.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2010] [Accepted: 09/21/2010] [Indexed: 11/18/2022]
Abstract
Sequence analysis of the imprinted UBE3A gene in a 3-year-old girl suspected of having Angelman syndrome had revealed a de novo 3bp in frame deletion predicted to encode a protein lacking the amino acid G538 (based on sequence NM_130838). In order to assess the clinical relevance of this unknown variant, we determined the parental origin and the functional consequences of the deletion. We separated the two chromosomes 15 by microdissection of metaphase spreads and used cytogenetic and molecular markers to demonstrate that the deletion is on the maternal chromosome. For determining the functional consequences of the deletion, we modelled the structure of the deletion mutant based on the wildtype X-ray structure and simulated the molecular dynamics of the wildtype and mutant protein in complex with UcbH7. Our simulations showed that deletion of G538 destroys a network of salt bridges between highly conserved residues in the catalytic cleft of UBE3A. In conclusion, our results strongly suggest that the 3bp deletion is a loss-of-function mutation of the maternal UBE3A allele that has caused Angelman syndrome in our patient. Our study may serve as a paradigm to determine the parental origin of a de novo mutation.
Collapse
|
98
|
Gross S, Janssen S, de Vries B, Terao E, Daas A, Buchheit KH. Collaborative study for the validation of alternative in vitro potency assays for human tetanus immunoglobulins. Biologicals 2010; 38:501-10. [DOI: 10.1016/j.biologicals.2010.03.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2010] [Revised: 03/08/2010] [Accepted: 03/13/2010] [Indexed: 10/19/2022] Open
|
99
|
Feng Y, Gross S, Hammes HP. Persistierende Angiogenese unter Hyperoxie in der Mausretina. DIABETOL STOFFWECHS 2010. [DOI: 10.1055/s-0030-1253766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
100
|
Tischendorf JJW, Gross S, Winograd R, Hecker H, Auer R, Behrens A, Trautwein C, Aach T, Stehle T. Computer-aided classification of colorectal polyps based on vascular patterns: a pilot study. Endoscopy 2010; 42:203-7. [PMID: 20101564 DOI: 10.1055/s-0029-1243861] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND AND STUDY AIMS Recent studies have shown that narrow-band imaging (NBI) is a powerful diagnostic tool for differentiating between neoplastic and nonneoplastic colorectal polyps. The aim of the present study was to develop and evaluate a computer-based method for automated classification of colorectal polyps on the basis of vascularization features. PATIENTS AND METHODS In a prospective pilot study with 128 patients who were undergoing zoom NBI colonoscopy, 209 detected polyps were visualized and subsequently removed for histological analysis. The proposed computer-based method consists of image preprocessing, vessel segmentation, feature extraction, and classification. The results of the automated classification were compared to those of human observers blinded to the histological gold standard. RESULTS Consensus decision between the human observers resulted in a sensitivity of 93.8 % and a specificity of 85.7 %. A "safe" decision, i. e., classifying polyps as neoplastic in cases when there was interobserver discrepancy, yielded a sensitivity of 96.9 % and a specificity of 71.4 %. The overall correct classification rates were 91.9 % for the consensus decision and 90.9 % for the safe decision. With ideal settings the computer-based approach achieved a sensitivity of approximately 90 % and a specificity of approximately 70 %, while the overall correct classification rate was 85.3 %. The computer-based classification showed a specificity of 61.2 % when a sensitivity of 93.8 % was selected, and a 53.1 % specificity with a sensitivity of 96.9 %. CONCLUSIONS Automated classification of colonic polyps on the basis of NBI vascularization features is feasible, but classification by observers is still superior. Further research is needed to clarify whether the performance of the automated classification system can be improved.
Collapse
|