The clinical course of @entity816 grade 2 (A2) is highly variable and is not reflected by morphological characteristics. Earlier studies using small series of A2 cases suggest that in situ hybridization (ISH) with chromosome-specific DNA probes allows for frequent detection of aneusomy 1, trisomy 7, and monosomy 10. The role of trisomy 7 in @entity105 is disputed, however, because of its presence in non-neoplastic brain tissue, as detected by karyotyping. Our objective was to investigate whether there was a correlation between chromosomal aberrations and survival in a series of 47 cases of A2. All cases were evaluated for numerical aberrations of chromosomes 1, 7, and 10 by ISH. @entity2008 were detected in 68% of cases of A2. @entity20899 was seen in 31 cases (66%), 22 of which (47%) had a high percentage of this numerical aberration. Only 11 of these 22 cases also showed aneusomy for 1 or 10. No cells or only a few cells with aberrations were detected in non-neoplastic control samples. Using Kaplan-Meier analysis, @entity20899 correlated significantly with shorter survival. Hence, as determined by ISH, @entity20899 is absent in non-neoplastic brain tissue and is frequently detected in A2, correlating with the malignant progression of the disease.

Gain of chromosome 7, as detected by in situ hybridization, strongly correlates with shorter survival in XXXX grade 2.

@entity2008 :: ('MESH:D002869', 'Disease') :: ['Chromosomal aberrations'] @entity105 :: ('MESH:D063646', 'Disease') :: ['astrocytoma carcinogenesis'] @entity816 :: ('MESH:D001254', 'Disease') :: ['astrocytoma'] @entity20899 :: ('MESH:C537822', 'Disease') :: ['trisomy/polysomy 7', 'Trisomy/polysomy 7']
@entity816 :: (MESH:D001254,Disease) :: ['astrocytoma']
