Clinicopathologic significance of β-catenin protein and loss of heterozygosity on 10q in medulloblastoma / 中华病理学杂志

<p><b>OBJECTIVE</b>To study the expression of β-catenin protein and the status of loss of heterozygosity (LOH) on chromsome 10q in medulloblastoma, with clinical correlation.</p><p><b>METHODS</b>Immunohistochemical study for β-catenin protein was carried out in 50 cases of medulloblastoma encountered in the First Affiliated Hospital of Xinjiang Medical University during the period from 2002 to 2011, including 32 cases of classic medulloblastoma, 13 cases of desmoplastic medulloblastoma and 5 cases of medulloblastoma with extensive nodularity. The status of LOH on 10q was also detected by fluorescence in-situ hybridization. The clinicopathologic characteristics and prognostic parameters were studied by Kaplan-Meien and Cox analysis.</p><p><b>RESULTS</b>The rates of expression of β-catenin protein in classic medulloblastoma, desmoplastic medulloblastoma and medulloblastoma with extensive nodularity were 53.1% (17/32), 4/13 and 1/5, respectively. The rate of LOH on 10q was 33.3% (8/24) in classic medulloblastoma and 2/11 in desmoplastic medulloblastoma. There was no statistically significant difference between the two tumor types. Univariate analysis showed that the expression of β-catenin protein (P = 0.022), lack of LOH on 10q (P = 0.020), extensiveness of tumor resection (P < 0.01), radiotherapy (P = 0.002) and chemotherapy (P < 0.01) represented important prognostic factors.</p><p><b>CONCLUSIONS</b>Medulloblastoma with expression of β-catenin protein and without LOH on 10q carries a better prognosis. Assessment of these parameters is helpful in evaluating prognosis and subsequent patient management.</p>

Clinical and pathologic analysis of astrocytic tumors with loss of heterozygosity on chromosome 10q / 中华病理学杂志

<p><b>OBJECTIVE</b>To study the correlation between loss of heterozygosity (LOH) on chromosome 10q and pathologic features, pathogenesis, prognosis of astrocytic tumors.</p><p><b>METHODS</b>LOH on 10q was studied by interphase fluorescence in-situ hybridization (FISH) in 85 cases of astrocytic tumor, including 35 cases of WHO grade II tumors and 50 cases of WHO grade IV tumors.</p><p><b>RESULTS</b>LOH on 10q was detected in 6 cases (17.1%) of diffuse astrocytoma (WHO grade II) and 34 cases (68.0%) of glioblastoma (WHO grade IV). 10q polysomy was detected in 7 cases (20.0%) of diffuse astrocytoma and 11 cases (22.0%) of glioblastoma. The rates of LOH on 10q in young age group and elderly group were 36.4% (12/33) and 82.4% (28/34), respectively. The difference was of statistical significance (P < 0.05). The rates of LOH on 10q in the diffuse astrocytoma and glioblastoma were 21.4% (6/28) and 87.2% (34/39), respectively. The difference was also statistically significant (P < 0.05). Univariate survival analysis showed that patient age, pathologic grade and 10q on LOH correlated with duration of survival (P < 0.05).</p><p><b>CONCLUSIONS</b>There are correlation between 10q LOH, patient age and pathologic grade of astrocytic tumors. LOH on 10q is also related to the pathogenesis of astrocytic tumors and is helpful in predicting prognosis.</p>