Search results for "Sarcoma"
showing 10 items of 566 documents
SUL METABOLISMO DEGLI ORGANI DI RATTO PORTATORE DI SARCOMA DA BENZOPIRENE
1955
Free aminoacids were estimated in benzopyrene sarcoma of rats and in some organs of the tumour-bearing rats (brain, heart, muscle, lung, liver, spleen, kidney). In the tumour the content changes according to the growth stage; in the advanced tumour a strong increase of serine-glycine, glutammic acid and treonine is observed. In the organs the free amino acid contents are diminished in the first stages of the tumour growth, while in the advanced stages there is a tendency to an increase with different values according to the organs. The oxidation process in the organ homogenate (with or without substrate addition) varies according to the stage of the tumour growth, more evidently in the org…
Dermatofibrosarcoma protuberans: estudio de factores pronósticos
2012
Introducción: El dermatofibrosarcoma protubernas (DFSP) es un tumor cutáneo de malignidad intermedia clasificado dentro de los tumores fibrohistiocíticos que tiene una alta tasa de recidivas locales tras extirpaciones con cirugía convencional pero baja capacidad de producir metástasis. Hipótesis: Existen determinadas características del DFSP que condicionan un crecimiento más infiltrativo, asimétrico e impredecible, lo que supone mayor morbilidad para el paciente y una mayor dificultad para su tratamiento. Objetivos: 1.-Realizar un análisis observacional y descriptivo de una serie de casos de DFSP que han sido vistos en el Servicio de Dermatología del IVO, según las características epidemio…
Absence of mutation at the GAP-related domain of the neurofibromatosis type 1 gene in sporadic neurofibrosarcomas and other bone and soft tissue sarc…
1995
The NF1 gene encodes neurofibromin, a GTPase-activating protein containing a GAP-related domain (NF1-GRD) that is capable of downregulating ras by stimulating ras intrinsic GTPase activity. We tested 44 sarcomas, nine of which corresponded to sporadic neurofibrosarcomas, for mutations at the NF1-GRD by the polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) technique, finding no mutation in every sample tested. We suggest that inactivation of the NF1-GRD by gene mutation seems not to be an important event in the tumorigenesis of sarcomas.
Bleomycin: Action on growth of oncogenic RNA viruses and on cell transformation
1975
Bleomycin (BLM) inhibits cell proliferation of noninfected chick embryo fibroblasts by blocking their DNA synthesis selectively. Chick embryo fibroblasts have beentransformed by Schmidt-Ruppin D strain of Rous Sarcoma Virus. Transformation has been determined by a focus assay. Foci formation is strongly reduced by BLM. Virus replication is inhibited by BLM in growing and confluent monolayer cells. This result might be explained by the observation that this drug reduces proliferation of growing and of confluent monolayer cells very sensitively. During the first 24 hours after infection the BLM inhibitory effect is more pronounced than in the case of BLM-application during the period 24--48 h…
WRN protects against topo I but not topo II inhibitors by preventing DNA break formation
2008
The Werner syndrome helicase/3′-exonuclease (WRN) is a major component of the DNA repair and replication machinery. To analyze whether WRN is involved in the repair of topoisomerase-induced DNA damage we utilized U2-OS cells, in which WRN is stably down-regulated (wrn-kd), and the corresponding wild-type cells (wrn-wt). We show that cells not expressing WRN are hypersensitive to the toxic effect of the topoisomerase I inhibitor topotecan, but not to the topoisomerase II inhibitor etoposide. This was shown by mass survival assays, colony formation and induction of apoptosis. Upon topotecan treatment WRN deficient cells showed enhanced DNA replication inhibition and S-phase arrest, whereas af…
CARCINOSARCOMA ARISING IN A DERMOID CYST OF OVARY: A CASE REPORT
2005
BACKGROUND: Transformation of a cystic benign teratoma of the ovary into a "carcinosarcoma" has very rarely been reported and its histogenetic origin is still debated. CASE PRESENTATION: A case of carcinosarcoma arising from a dermoid cyst is reported. The tumor showed cystic areas delimited by normal squamous epithelium, with transitional areas through dysplastic epithelium to "in situ" and infiltrating squamous cell carcinoma (SCC). The sarcomatous component showed compact tissue composed of round cells concentrically arranged around small vessels, spindle, and pleomorphic cells with a high nuclear-cytoplasmic ratio. Positive staining for vimentin, alpha smooth muscle actin and CD10, as w…
Rhabdomyosarcoma of the Oral Tissues: two new cases and literature review
2006
Rhabdomyosarcoma (RMS) is a malignant soft tissue neoplasm consisting of cells derived from the primitive mesenchyme that exhibit a profound tendency to myogenesis. About 35% of RMS arises in the head and neck, being classified as parameningeal and non-orbital non-parameningeal forms. Parameningeal tumors carry the worst prognosis. The use of contemporary, multi-agent chemotherapy, radiotherapy, and surgery has made treatment of the disseminated disease possible, and has significantly improved overall survival from 25% in 1970 to 70% in 1991. Here, we present the management of two cases of orofacial RMS in adolescents: an 18-year-old, white female that had a 9-month history of a nodule in t…
A short story of 3AB-OS Cancer Stem Cells, a possible model for studying cancer stemness
2014
All tumors contain a population of Cancer Stem Cells (CSCs) responsible for the initiation, growth and development of the tumor and a challenge in cancer research is their identification and eradication. In our laboratory, by chemical treatment of the human osteosarcoma MG63 cell line, we have isolated and characterized the human OS CSC line (3AB-OS). 3AB-OS CSCs have a significant chromosomal complexity and a large number of molecular abnormalities which appear to be strongly congruent with those described in a large number of pediatric and adult osteosarcomas. 3AB-OS cells transdifferentiated in vitro into cells of all three primary germ layers and, when xenografted in athymic mice they w…
SURGICAL TREATMENT OF GASTROINTESTINAL STROMAL TUMOR AND IMPLICATIONS OF NEO-ADJUVANT TREATMENT
2013
Gastrointestinal stromal tumor is not frequently type of sarouma found in the digestive system, often arise in the wall of the stomach or stromal cells of the intestinal wall.
The Neoplastic Side of the Abdominal Wall: A Comprehensive Pictorial Essay of Benign and Malignant Neoplasms
2023
Abdominal wall neoplasms are usually benign and, in the majority of these cases, no further work-up or treatment is indicated. The percentage of malignant abdominal neoplasms, however, is not negligible. Radiologists play a pivotal role in identifying imaging features that should favor malignancy, including larger lesion size, edema, neurovascular involvement, and peripheral or inhomogeneous dynamic enhancement, thus indicating to the clinician the need for further work-up. Histopathology is the reference standard for the characterization of abdominal wall neoplasms. In patients undergoing surgery, radiological assessment is needed to guide the surgeon by providing a comprehensive anatomic …