No abstract available.
Gliosarcoma*

PURPOSE: The aim of this sutdy was to evaluate the feasibility of 3-[131I]Iodo-O-methyl-L-a-methyltyrosine ([131I]OMINT) as an agent for tumor image. MATERIALS AND METHODS: After synthesis of 4-O-methyl-L-a-methyltyrosine (OMAMT), OMAMT was labeled with 131I using Iodogen method. In viro cellular uptake study was performed using 9 L gliosarcoma cells at various time points upto 4 hr. The biodistribution (five rats implanted with the 9 L gliosarcoma cells per group) was evaluated at 30 min, 2 hr, 24 hr after iv injection of 3.7 MBq [131I]OMIMT or L-3-[131I]iodo-a-methyltyrosine ([131I]IMT). Gamma camera images were obtained at 30min, 2 hr, and 24 hr. RESULTS: [131I]OMINT uptake was 3.3 times and 2.5 times higher than [131I]IMT uptake at 30 min and 60 min, respectively and same after 2 hr in in vitro sutdy using 9L gliosarcoma cells. Maximum accumulation in tumor occurred at 30 min for both [131IOMINT and [131I]IMT in tumor bearing rats. The tumor uptake of [131I]OMINT was significantly higher than that of [131I]IMT in tumor bearing rats. The tumor uptake of [131I]OMIMT was significantly higher than that of [131I]IMT at early time point studied (3.74 +/- 0.48 vs 0.38 +/- 0.17% ID/g at 30 min and 2.40 +/- 0.17 vs 0.24 +/- 0.03% ID/g at 2 hr, respectively, p<0.01). However, the tumor uptake of both radiolabels were not significantly different at 24 hr (0.04 +/- 0.01 vs 0.05 +/- 0.01% ID/g). Tumor was visualized as early as at 30 min in gamma camera images. CONCLUSION: These data suggested that [131I]OMIMT might be a useful tumor imaging agent and has more advantage for the tumor imaging compared to [131I]IMT.
Animals ; Gamma Cameras ; Gliosarcoma ; Rats*

Gliosarcoma (GS) is a rare variant (2%) of glioblastoma (GBM) that poses clinical genomic challenges because of its poor prognosis and limited genomic information. To gain a comprehensive view of the genomic alterations in GS and to understand the molecular etiology of GS, we applied whole-exome sequencing analyses for 28 GS cases (6 blood-matched fresh-frozen tissues for the discovery set, 22 formalin-fixed paraffin-embedded tissues for the validation set) and copy-number variation microarrays for 5 blood-matched fresh-frozen tissues. TP53 mutations were more prevalent in the GS cases (20/28, 70%) compared to the GBM cases (29/90, 32%), and the GS patients with TP53 mutations showed a significantly shorter survival (multivariate Cox analysis, hazard ratio=23.9, 95% confidence interval, 2.87–199.63, P=0.003). A pathway analysis showed recurrent alterations in MAPK signaling (EGFR, RASGRF2 and TP53), phosphatidylinositol/calcium signaling (CACNA1s, PLCs and ITPRs) and focal adhesion/tight junction (PTEN and PAK3) pathways. Genomic profiling of the matched recurrent GS cases detected the occurrence of TP53 mutations in two recurrent GS cases, which suggests that TP53 mutations play a role in treatment resistance. Functionally, we found that TP53 mutations are associated with the epithelial–mesenchymal transition (EMT) process of sarcomatous components of GS. We provide the first comprehensive genome-wide genetic alternation profiling of GS, which suggests novel prognostic subgroups in GS patients based on their TP53 mutation status and provides new insight in the pathogenesis and targeted treatment of GS.
Glioblastoma ; Gliosarcoma* ; Humans ; Prevalence* ; Prognosis

Gliosarcoma is a rare primary brain tumor composed of neoplastic glial cells and a sareomatous spindle-cell element. We report three cases of gliosarcoma, and describe their MR findings, which in many respects are very similar to those of malignant astrocytomas. Gliosarcomas are, however, more peripherally located, abutting and/or invading the dura mater, and at T2-weighted imaging their signal intensity is lower than is usually the case with malignant astrocyomas. Despite its rarity, the possibility of gliosarcoma should be considered when MR findings of this nature are apparent.
Astrocytoma ; Brain Neoplasms ; Dura Mater ; Gliosarcoma* ; Magnetic Resonance Imaging* ; Neuroglia

The authors encountered a case of gliosarcoma with hemorrhage arising in the left frontotemporal lobe of a 34-year old woman who five months previously had undergone surgery for an ICH in the same lobe. On CT brain scan, we could a slight hyperdense tumor with irregular enhancement could be detected, and perilesional edema and obvious mass effect were also noted. The tumor was firm and surgically,its margine was somewhat poor. On pathologic and histochemical study, the presence of a gliosarcoma was confirmed.
Adult ; Brain ; Brain Neoplasms ; Edema ; Female ; Gliosarcoma* ; Hemorrhage* ; Humans

Experimental brain tumor model is essential for the development of new therapeutic modalities of brain tumors and evaluation of efficacy of each therapeutic variety. Authors developed experimental rat brain tumor model with 9L and C6 cell line in Fischer rat using stereotactic method. We tried to determine the tumor occurrence rate, the ideal time for secondary experiment using this brain tumor model, and the duration between the onset of neurological signs and the time of expiration. We performed autoradiography for each cell line to evaluate the reliance of the tumor model. We could make good tumor model in all the cases of experiment and except to use it in another extension of experiment.
Animals ; Autoradiography ; Brain Neoplasms* ; Brain* ; Cell Line ; Gliosarcoma* ; Rats*

Astrocytic tumors, particularly gliosarcoma, may contain epithelial features in the form of trabecular, adenoid, papillary arrangement, and squamous metaplasia. A case of gliosarcoma with unusual epithelial feature is described. The patient was a 60-year-old male with frequent seizures. The mass was 4 cm and in the left frontal lobe. Trabecular or rarely adenoid arrangement of neoplastic astrocytes was present in the mucinous stroma, and there was a distinctive transition between the trabecular area and typical anaplastic astrocytoma. The tumor cells in the trabecular area showed positive immunostain for glial fibrillary acidic protein, but did not react with various kinds of cytokeratin. The sarcomatous area was undifferentiated and was not labeled by factor-VIII, desmin, and anti-smooth muscle actin. Occurrence and histogenesis of epithelial features in gliosarcoma are reviewed. The importance to recognize the existence of epithelial feature in malignant astrocytic tumor is emphasized.
Brain Neoplasms/surgery ; Brain Neoplasms/pathology* ; Case Report ; Epithelium/pathology ; Gliosarcoma/surgery ; Gliosarcoma/pathology* ; Human ; Magnetic Resonance Imaging ; Male ; Middle Age

A case of left temporal gliosarcoma is reported. The patient was a 40-year old man who had headache, behavior change, dysphasia, and mental confusion for about 2 months duration. On brain CT, a large partially cystic mass with homogeneous enhancement was located at left temporal lobe and associated with remarkable peritumoral edema and mass effect. Angiographic tumor vascularity was faintly visualized. Surgical subtotal resection of the tumor and post-operative radiotherapy offered transient symptomatic improvement, being followed within several months by clinical deterioration and regrowth of the tumor on brain CT. Light microscopic studies of the H & E and special stained specimens showed two different components within the tumor in a mixed fashion, i.e. intermingled glioblastoma multiforme and fibrosarcoma. Electron microscopic study of the sarcomatous cells disclosed intracytoplasmic Weibel-Palade-like bodies, a specific marker of endothelial cells. The fibrosarcomatous component of gliosarcoma is believed to be originated from malignant transformation of the hyperplastic endothelial cells within the anaplastic glioma. Literature concerned with gliosarcoma is reviewed.
Adult ; Aphasia ; Brain ; Edema ; Endothelial Cells ; Fibrosarcoma ; Glioblastoma ; Glioma ; Gliosarcoma* ; Headache ; Humans ; Radiotherapy ; Temporal Lobe

The clinicopathologic features of 3 cases of intracerebral gliosarcoma are reported and correlations among the CT findings, angiographic findings, the surgical and histological aspects are discussed. In two cases, these tumors appear on CT scan as an isodense mass with well defined margins and homogenous contrast enhancement, attached to flax, which may mimic that of meningioma, but has a cystic or necrotic area and calcific area. Angiographic findings are different, one showed scanty tumor staining and another showed mixed dural and pial vascular supply, early cortical venous drainage, irregular tumor vessels, and a prominent vascular stain with well defined tumor margins. These tumors were rather well demarcated, firm in surgical aspect. In order case, tumor appears on CT scan as huge intracerebral lesions, with large necrotic areas and peripheral contrast enhancement:this CT aspect, similar to that of glioblastoma, corresponds to a rather diffusely infiltrating growth of the tumor and the prevalence of a gliomatous component. The genesis and histopathology of gliosarcoma are also discussed and we needs more prolonged period of time for study on metastasis and prognosis of these cases.
Angiography ; Drainage ; Flax ; Glioblastoma ; Gliosarcoma ; Meningioma ; Neoplasm Metastasis ; Prevalence ; Prognosis ; Tomography, X-Ray Computed

The authors report a case of frontal gliosarcoma. The characteristic of this tumor is that it is composed of mixed glial and sarcomatous elements. The sarcomatous elements are thought to derive from the neoplastic transformation of mesenchymal cells in or adjacent to the tumor. This transformation usually has the appearance of a fibrosarcoma or angiosarcoma. A 24-year-old man had a 1-month history of headache, dizziness followed by blurred vision. At admission, there was no focal neurological deficit except bilateral papilledema. Brain CT and MRI revealed a heterogeneously enhancing mass containing cystic portion in the right frontal lobe with considerable peritumoral edema and shift of the midline structures. A craniotomy was performed with gross total resection of the tumor. Postoperative course was uneventful with resolution of his symptoms. The histologic, immunohistochemical and electron microscopy studies revealed bimorphic pattern, a characteristic feature of gliosarcoma.
Brain ; Craniotomy ; Dizziness ; Edema ; Fibrosarcoma ; Frontal Lobe ; Gliosarcoma* ; Headache ; Hemangiosarcoma ; Humans ; Magnetic Resonance Imaging ; Microscopy, Electron ; Papilledema ; Young Adult