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  • 1
    ISSN: 1600-0501
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: The potential use of autologous thrombocytic growth factors to accelerate bone regeneration requires improved methods of isolating platelet-rich plasma (PRP). In addition to discontinuous cell separation, a second method by which PRP is produced at the point-of-care has now become available. In this study, growth factor levels in PRP from these two sources were compared. Whole blood was drawn from 115 healthy donors (73 males, 42 females) aged 21 – 62 years (mean 36, SD 10). The PRP was separated by the blood bank (BB) using the discontinuous cell separation method or at the ‘point-of-care’ by the so-called ‘buffy coat’ method (analogous to the Curasan PRP Kit). Growth factor content differed significantly for TGF-β1 (BB 268.65±70.77 ng/ml, Curasan 95.02±60.67 ng/ml (sign test P〈0.001)) and PDGF-AB (BB 133.59±46.26 ng/ml, Curasan 233.70±111.86 ng/ml (P〈0.001)), while the content of IGF-I (BB 85.37±25.58 ng/ml, Curasan 101.72±47.7 ng/ml (P〈0.160)) showed no significant difference. The higher thrombocyte count in the BB PRP (BB 1434300±351960/μl, Curasan 908.500±492.30/μl) seems to result in higher TGF-β1 levels, while the higher leukocyte count in the Curasan PRP (BB 160±320/μl, Curasan 30130±12500/μl) seems to result in higher PDGF-AB levels. The similar IGF-I levels in the two preparations might merely reflect similar amounts of plasma in the PRP produced by each approach.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Mund-, Kiefer- und Gesichtschirurgie 4 (2000), S. 105-110 
    ISSN: 1434-3940
    Keywords: Schlüsselwörter Plattenepithelkarzinom ; Positronenemissionstomographie ; 18FDG ; Onkologische Nachsorge ; Rezidiv ; Screening ; Key words Squamous cell carcinoma ; Positron emission tomography ; 18FDG ; Oncologic aftercare ; Tumor recurrence ; Screening (methods)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Aims: The predominant cause of death due to oral cancer is the failure to control local tumor due to regional tumor recurrence. The sequelae of surgical resection and high-dose irradiation cause substantial changes in head and neck anatomy, leading to considerable problems in the early morphological detection of recurrent disease. Therefore, this study evaluates the verification of cancer recurrence by means of its pathologic glucose metabolism. Materials and methods: We reviewed a total of 50 [18F]-2-fluordeoxyglucose positron emission tomography (18FDG-PET) investigations performed in 44 patients who had undergone surgical resection of oral cancer. In 23 cases, re-staging (group A) was indicated due to suspicion of recurrent or secondary tumor manifestation. In 27 cases, PET served as a screening procedure (group B). Statistic evaluation included sensitivity, specifity, positive/negative predictive value and accuracy of 18FDG-PET for the detection of tumor manifestation. Results: 18FDG-PET correctly identified 23 of 26 tumor sites (88%) in the re-staging group and 9 of 10 tumor sites (90%) in the screening group. We encountered a total number of 16 false-positive foci with an increased 18FDG-uptake. In six patients, 18FDG-PET detected tumor recurrence several months before a morphological correlative could be identified. In 5 of these 6 patients, the PET findings for the latter tumor sites determined the patient’s fate. Specificity was 63% for local recurrence, 97% for secondary lymph node involvement and 90% for distant metastasis. Conclusion: According to these data, 18FDG-PET is the most effective diagnostic tool in the follow-up of oral cancer patients to date. Due to the high prevalence of recurrent disease in the follow-up of oral cancer, either the detection of early recurrence or the identification of additional, incurable tumors may add substantially to a rational therapeutic management. We therefore recommend 18FDG-PET for screening and re-staging of recurrent oral cancer.
    Notes: Zusammenfassung Fragestellung: Die Letalität des Mundhöhlenkarzinoms resultiert überwiegend aus sekundären, regionalen Tumormanifestationen. Therapiebedingte Veränderungen der Anatomie erschweren die klinische Tumornachsorge und Interpretation morphologisch bildgebender Verfahren so erheblich, dass die Dignität suspekter Gewebeformationen häufig nicht zuverlässig beurteilbar ist. Die vorliegende Studie untersucht daher die Wertigkeit eines Nachweises sekundärer Tumormanifestationen anhand ihrer Glukosestoffwechselaktivität. Material und Methode: Bislang wurden 50 PET-Untersuchungen mit [ 18 F]-2-Fluordeoxyglukose ( 18 FDG) bei 44 Patienten nach primär kurativ intendierter Therapie von Mundhöhlenkarzinomen vorgenommen. Bei 22 Patienten (Gruppe A) wurden 23 Untersuchungen als Rezidiv-Staging durchgeführt. 27 Untersuchungen wurden als Screening-Maßnahme (Gruppe B) eingesetzt. Für den Nachweis von Tumorgewebe wurden Sensitivität, Spezifität und die positive bzw. negative Prädiktion bestimmt. Ergebnisse: Bei 18 von 22 Patienten aus Gruppe A wurden von 26 Tumormanifestationen 23 durch die PET dargestellt (Sensitivität 88%). Bei 6 Patienten aus Gruppe B wurden im PET-Screening 9 von 10 Tumorlokalisationen erkannt. Insgesamt wurden 16 falsch-positive Anreicherungen auffällig. In 6 Fällen konnte die PET Tumorformationen bereits Monate vor dem Nachweis eines morphologischen Korrelats aufzeigen. Die zusätzlichen Befunde erwiesen sich bei 5 dieser 6 Patienten als prognosebestimmend. Die Spezifität des Tumornachweises lag für Lokalrezidive bei 63%, für Lymphknotenfiliae bei 97% und für Fernmetastasen bei 90%. Schlussfolgerungen: Nach diesen Ergebnissen stellt die 18 FDG-PET das derzeit effektivste Diagnoseverfahren in der Nachsorge des Mundhöhlenkarzinoms dar. Bei einer Tumorprävalenz um 60% in der untersuchten Risikogruppe ist mit einer substanziellen Verbesserung der Früherkennung und auch mit einer rechtzeitigen Darstellung therapielimitierender Befunde zu rechnen. Die vorliegenden Daten rechtfertigen daher eine Ausdehnung der Indikation zum ¶Screening und zum Rezidiv-Staging im Rahmen der onkologischen Nachsorge des Mundhöhlenkarzinoms.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 411 (1987), S. 561-568 
    ISSN: 1432-2307
    Keywords: Psammous desmo-osteoblastoma ; Ultrastructure ; Osteonectin ; Bone tumours ; Fibro-osseous lesion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Fibro-osteo-cemental lesions of the jaw bones are a heterogeneous group of diseases which present problems in classification. Psammous desmo-osteoblastoma is one of four newly proposed entities (Makek 1983) and has until now been characterized by its light microscopic, clinical and radiological features. On electron microscopy this tumour exhibits fibroblastic (preosteoblastic), osteoblastic and osteocytic cells and a globular mineralization unlike the mineralization of the psammoma bodies. Immunohistological investigations with anti-osteonectin, a bone specific protein linking mineral to collagen, showed positive intracellular staining in all tumour cells and extracellular staining in the osteoid. The psammoma bodies were, however, not stained. These results confirm the view of the osteogenic histogenesis of psammous desmo-osteoblastoma, with an osteogenic differentiation of the tumour cells, bone formation and association of psammoma bodies which are not of bone origin. This combination of findings supports the view that psammous desmo-osteoblastoma represents a new and distinct entity occuring in desmal preformed cranio-facial bones which should be incorporated in a revised WHO-classification.
    Type of Medium: Electronic Resource
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