Abstract
Comparative genomic hybridization (CGH) studies have shown that chromosome 8 is a frequent target for chromosomal aberrations in breast cancer. We characterized these aberrations of chromosome 8 in 16 breast cancer cell lines (BT-474, BT-549, CAMA-1, DU-4475, MCF-7, MDA-MB-134, MDA-MB-157, MDA-MB-361, MDA-MB-415, MDA-MB-436, MPE600, SK-BR-3, T-47D, UACC-812, UACC-893 and ZR-75-1) by CGH, fluorescence in situ hybridization (FISH) with arm- and locus-specific probes, and spectral karyotyping (SKY). Chromosome 8 was structurally abnormal in 13 of 16 cell lines. Loss of 8p was detected in nine cell lines, gain of entire 8q in six cell lines, 8q21-qter in three, 8q23-qter in two, and 8q12-qter and 8p21-q21 in one cell line. Extra copies of the C-MYC oncogene were found in 11 cell lines, but high-level amplification only in SK-BR-3. Derivative chromosomes including material from chromosomes 8 were complex, and the breakpoints were strikingly dissimilar. Chromosome 11 was the most frequent translocation partner with chromosome 8 (in 7 cell lines). Isochromosomes and/or isoderivative 8q were found in four cell lines. The high frequency and complexity of alterations at 8q indicate a significant pathogenetic role in breast cancer. The hi...Continue Reading
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