ABSTRACT
<p><b>OBJECTIVE</b>To investigate the immunohistochemical expression of isocitrate dehydrogenase 1 gene (IDH1) R132H in glioma and its diagnostic utility.</p><p><b>METHODS</b>Immunohistochemical study of IDH1R132H expression was performed on formalin-fixed paraffin-embedded tissue samples of 75 gliomas, including 33 cases of grade II, 20 cases of grade III and 22 cases of grade IV tumors. Six cases of pilocytic astrocytoma and 12 cases of gliosis were used as controls.</p><p><b>RESULTS</b>Nineteen in 33 cases of grade II (57.6%), 8 in 20 cases of grade III (40.0%), 6 in 22 cases of grade IV (27.3%) showed positive cytoplasmic staining of IDH1R132H. Scattered invasive glioma cells at the tumor periphery also expressed IDH1R132H. Gliomas involving the frontal lobe showed more strong IDH1R132H staining. In contrast, none of the pilocytic astrocytomas and gliosis showed IDH1R132H staining. Moreover, the rate of p53 immunopositivities were 42.4% (14/33) in grade II, 65.0% (13/20) in grade III and 77.3% (17/22) in grade IV gliomas. There were no statistic correlations between expression of IDH1R132H and p53.</p><p><b>CONCLUSION</b>IDH1R132H tends to express preferentially in low-grade gliomas, and it thus may serve as a valuable marker in distinguishing low grade gliomas from gliosis.</p>
Subject(s)
Adolescent , Adult , Aged , Child , Female , Humans , Male , Middle Aged , Young Adult , Astrocytoma , Metabolism , Pathology , Brain Neoplasms , Metabolism , Pathology , Diagnosis, Differential , Glioma , Metabolism , Pathology , Gliosis , Metabolism , Pathology , Isocitrate Dehydrogenase , Genetics , Metabolism , Mutation , Tumor Suppressor Protein p53 , MetabolismABSTRACT
<p><b>OBJECTIVE</b>To study the clinicalpathologic features of intracranial multiple lesions.</p><p><b>METHODS</b>The clinical, radiologic and pathologic features of intracranial multiple lesions in 62 cases during the period from 2005 to 2009 in Xuanwu Hospital were retrospectively reviewed.</p><p><b>RESULTS</b>There were 32 males and 30 females in 62 cases. The mean age of seize onset and duration of disease were 37.4-year-old and 11.6 months, respectively. The lesions could affect cerebral hemisphere, basal ganglia, brain stem, cerebellum and other parts, most lesions were located above the tentorium. Pathological diagnosis as follows: 13 patients with glioma; metastatic tumors in 13 cases; 12 cases of central nervous system infection; immune-mediated inflammatory demyelinating disease in 8 cases; 5 cases of primary lymphoma of central nervous system; primary angiitis of the central nervous system 3 cases; mitochondrial encephalopathy 2 cases; vein thrombosis in 2 cases; Rosai-Dorfman disease in 2 cases; 2 case of radiation encephalopathy. Among them, mitochondrial encephalopathy and vein thrombosis lesions located in the cortex; metastatic tumor and blood-borne infection mainly involving junction of grey and white matter; glioma, radiation encephalopathy and demyelinating disease include white matter lesions; vascular inflammation showed cortical and subcortical white matter lesions.</p><p><b>CONCLUSIONS</b>A variety of tumor and non-neoplastic diseases can be expressed in intracranial multiple lesions, which gliomas, metastatic tumor and central nervous system infections are more common. In order to improve the diagnosis of intracranial multiple lesions, active work in the brian biopsy, study the clinical, imaging and pathological findings must be closely.</p>