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  • 1
    ISSN: 1432-2307
    Keywords: Bone tumors ; Osteosarcoma ; Osteonectin ; Immunocytochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 18 bone-forming tumours and tumour-like lesions were investigated immunocytochemically for the presence of osteonectin. A group of non-bone-forming skeletal tumours (five cartilage-forming tumours, four Ewing sarcomas and five extraskeletal sarcomas) served as controls. The studies showed that osteonectin antibodies react reliably with benign and malignant bone-forming tumours (two cases of fibrous dysplasia, three osteoid osteomas, 13 osteosarcomas). This finding was supported by protein blot studies. Osteonectin is formed by cells which do not yet possess the morphological phenotype of osteoblasts and may be regarded as a “differentiation marker” of the osteoblastic lineage. Only chondroid bone (tissue in which chondrocytes were surrounded by osteoid matrix containing type I and type II collagen) showed a positive reaction. All other primary skeletal tumours and extraskeletal soft tissue tumours were completely negative.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2277
    Keywords: Key words Transplantation for malignancy ; Adjuvant chemotherapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract New data show that perioperative cytostatic therapy is beneficial in the case of liver transplantation for hepatic cancer. However, it has not been established clearly whether chemotherapy interferes with graft rejection. We therefore studied the interactions between tumor growth and graft rejection, especially with regard to chemotherapy, using a combined tumor/transplantation model. As a tumor model, we used the Novikoff hepatoma, a malignant hepatoma that was injected subcutaneously into the backs of rats. Heterotopic heart grafting served as the transplantation model. In a first step (a), we studied the effect of cytostatic therapy on tumor growth: tumor cells were injected, and in four groups epirubicin, cyclosporine, epirubicin + cyclosporine, and placebo were applied, in corresponding groups, transplantation was additionally performed. Tumor growth was measured and the resected tumors were examined by histology and immunohistology. In a second step (b), we studied the effect of chemotherapy on graft rejection: transplantation was performed and the above-mentioned drugs were applied; in corresponding groups, a solid tumor was additionally induced and resected immediately before transplantation. The results of these procedures were as follows: (a) Epirubicin decreased tumor growth and diminished the volume-increasing effect of cyclosporine significantly. After transplantation, tumor growth was similar. (b) Epirubicin prolonged graft survival significantly, and the combination with cyclosporine had an augmenting effect. In the corresponding groups, graft survival was similar. In conclusions. chemotherapy diminishes the tumor-increasing effect of cyclosporine and does not interfere negatively with graft survival. It might therefore be beneficial after transplantation for malignancy.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 248 (1987), S. 409-415 
    ISSN: 1432-0878
    Keywords: Bone matrix ; Osteonectin ; Osteoblasts ; Immunocytochemistry ; Differentiation ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Bone matrix consists of type-I collagen and noncollagenous proteins. The latter represent only 10% of its total protein content. Since type-I collagen is also present in various other connective tissue sites (e.g., skin) it cannot be considered as bone specific. Among the non-collagenous components osteonectin — a 32 kilodalton (KD) glycoprotein linking mineral to collagen fibrils — is thought to be bone specific due to its biochemical properties. In the present study various skeletal and non-skeletal tissues were investigated for the presence of osteonectin by means of immunocytochemical methods. Two polyclonal antibodies against human and bovine osteonectin were applied. Immunocytochemically, osteonectin could be demonstrated in active osteoblasts and osteoprogenitor cells as well as in young osteocytes, while aged, quiescent osteocytes did not contain the protein, suggesting that the protein is a marker of the osteoblastic functional differentiation of bone cells. Osteonectin was absent in all non-skeletal tissues with the exception of chondrocytes in so-called mineralizing chondroid bone.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Der Chirurg 68 (1997), S. 732-737 
    ISSN: 1433-0385
    Keywords: Key words: Soft tissue neoplasm ; PNET ; Genetic translocation. ; Schlüsselwörter: Weichteiltumoren ; PNET ; genetische Translokation.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung. Der periphere primitive neuroektodermale Tumor (PNET) ist ein sehr seltener hochmaligner Weichteiltumor bei Kindern und jungen Erwachsenen. Er resultiert aus einer balanzierten reziproken Translokation an den q-Armen der Chromosomen 11 und 22, die zur malignen Entartung pluripotenter Zellen der Neuralleiste während der Embryogenese führt. Die Behandlung dieses undifferenzierten, kleinzelligen Tumors erfolgt gemäß der Kooperativen Weichteilsarkomstudie (CWS) der Deutschen Gesellschaft für Pädiatrische Onkologie: Durch eine präoperative Chemotherapie mit einem EVAIA-Schema gelingt in 95 % der Fälle eine Remission, wodurch ein verstümmelnder Eingriff vermieden und das Risiko einer intraoperativen Tumorzellaussaat verringert wird; nach Resektion des Resttumors sind eine Nachbestrahlung des Tumorbetts sowie weitere Chemotherapiezyklen vorgesehen. Ist wegen eines Querschnittsyndroms beim paravertebral gelegenem PNET eine primäre Operation erforderlich, ist unmittelbar postoperativ eine Chemotherapie, gefolgt von einer „Second-look-Operation“ und Nachbestrahlung obligat. Gemeinsam mit unseren Pädiatern und Strahlentherapeuten behandelten wir zwischen 1986 und 1994 10 Patienten. Bei 4 der zwischen 4 und 26 Jahre alten Patienten (Median: 14 Jahre) nahm der PNET seinen Ursprung von der Thoraxwand, bei 6 Patienten war er paravertebral-retroperitoneal lokalisiert. Fünf Patienten verstarben nach durchschnittlich 20 Monaten, 5 Patienten befinden sich nach 31, 46, 50, 51 und 91 Monaten in Vollremission.
    Notes: Summary. The primitive neuroectodermal tumor is a rare soft tissue neoplasm occurring in children and young adults. It derives from a carcinogeneic alteration of pluripotent neural crest cells, caused by a balanced reciprocal translocation t(11;22) (q24;q12). Treatment of this undifferentiated, extremely malignant small cell tumor is carried out in compliance with the soft tissue trail (CWS) from the German Society of Pediatric Oncology. Biopsy-proven diagnosis is followed by primary chemotherapy, which in 95 % of cases leads to remission, allowing excision of the remainder of the tumor without mutilation and avoidance of intraoperative tumor cell dissemination. After excision, irradiation of the tumor site and two further sequences of chemotherapy are performed. If PNETs of the paravertebral region cause symptoms of paralysis and immediate surgery is required, postoperative chemotherapy, a second-look operation and irradiation are mandatory. Between 1986 and 1994, in cooperation with our pediatric and radiotherapy colleagues, we treated ten patients. In four patients (median age, 14 years) the PNET originated from the chest wall, in six patients from the paravertebral and retroperitoneal region. Five patients died after 20 months on average, while the remaining five patients are in full remission after 31, 46, 50, 51 and 91 months, respectively.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Langenbeck's archives of surgery 379 (1994), S. 307-309 
    ISSN: 1435-2451
    Keywords: Benign pleural mesothelioma ; Localized ; Diagnosis ; Surgical management ; Prognosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Das benigne Pleuramesotheliom ist ein sehr seltener Tumor, für deren Ursprung die Mesothelien, aber auch das submesotheliale Bindegewebe diskutiert wird. Daher werden these Tumoren in der Literatur u. a. auch als Pleurafibrom, submesotheliales Fibrom, lokalisiertes fibröses Mesotheliom und monophasischer Spindelzelltumor beschrieben. Das Wachstum dieser Tumoren ist sehr langsam und geht über Jahre his Jahrzehnte. Im Gegensatz zum häufiger auftretenden malignen Pleuramesotheliom ist ein gehäuftes Auftreten nach Asbestex-position nicht zu beobachten. Wir berichten über eine 47jährige Patientin mit einem großen benignen Pleuramesotheliom im Bereich des rechten Thorax.
    Notes: Abstract Benign mesothelioma of the pleura is a very rare tumor. The cells responsible originate from either the mesothelium or the submesothelium. This is why such tumors are described in the literature as fibroma of the pleura, mesothelial fibroma, localized fibrous mesothelioma and monophasic spindle cell tumor. Their growth, is very slow taking several years or even decades. In contrast to the more common malignant mesothelioma of the pleura, it is not related to asbestos exposure. This report deals with a 47-year-old woman patient with a giant benign mesothelioma of the pleura in the region of the right thorax, which was completely removed by thoracotomy.
    Type of Medium: Electronic Resource
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