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- W2079013375 abstract "Abstract Cytogenetic analysis of uterine leiomyomata (UL) shows that about 40% of these benign tumors have simple, clonal chromosomal rearrangements. In contrast, their presumed malignant counterpart, leiomyosarcomas (LMSs), typically has complex numerical and structural abnormalities. Several variants of benign uterine smooth‐muscle tumors are defined by histologic phenotypes intermediate between typical UL and LMS, and currently, little is known about their cytogenetic and molecular genetic features. From a subset of more than 800 karyotyped ULs, we identified a group of nine cases exhibiting near‐diploid karyotypes with loss of almost the entire short (p) arm of chromosome 1 [i.e., del(1)(p11p36)]. Loss of 1p was often associated with other aberrations, particularly loss of chromosomes 19 and/or 22. Of eight UL for which the histologic diagnosis was known, four were diagnosed as cellular UL; one displayed both hypercellularity and nuclear atypia. Loss of heterozygosity (LOH) analysis for chromosomal regions 1p36.23 and 1p21.1 demonstrated allelic loss for either a portion or the majority of 1p in 5 of 10 additional archival UL diagnosed with either cellular or atypical histology. RNA from two UL with loss of 1p was profiled using Affymetrix GeneChips, and those profiles were compared to our previously reported smooth‐muscle tumor expression profile. The transcriptional profiles of tumors with 1p deletion were more similar to those of leiomyosarcoma than to profiles of myometrium and UL, as determined by hierarchical cluster analysis. Comparison of the transcriptional profiles for UL with and without 1p− revealed 53 genes with differential regulation. Loss of 1p appears to define a subgroup of UL distinct from those previously recognized. Furthermore, 1p− appears to be associated with a specific histologic phenotype. The similarity between the transcriptional profiles of LMS and UL with 1p− suggests the possibility of a common pathogenetic mechanism. © 2005 Wiley‐Liss, Inc." @default.
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- W2079013375 date "2005-11-30" @default.
- W2079013375 modified "2023-10-17" @default.
- W2079013375 title "Uterine leiomyomata with deletions of Ip represent a distinct cytogenetic subgroup associated with unusual histologic features" @default.
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- W2079013375 doi "https://doi.org/10.1002/gcc.20291" @default.
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