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High frequency of allelic imbalance at chromosome region 16q22-23 in human breast cancer: correlation with high PgR and low S phase

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Authors
Skirnisdottir, S
Eiriksdottir, G
Baldursson, T
Barkardottir, R B
Egilsson, V
Ingvarrson, S
Issue Date
1995-04-21

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Citation
Int. J. Cancer. 1995, 64(2):112-6
Abstract
The loss of genetic material from a specific chromosome region in tumors suggests that presence of tumor-suppressor genes. Loss of heterozygosity (LOH) or allelic imbalance (AI) on the long arm of chromosome 16 is a known event in sporadic breast cancer. To locate the commonly deleted regions, and therefore (a) candidate tumor-suppressor gene(s), a deletion map of chromosome 16 was made, using 10 microsatellite markers on 150 sporadic breast tumors. The 3 smallest regions of overlap (SRO) were detected on the long arm of chromosome 16. Allelic imbalance was observed with at least one marker in 67% of the tumors. One marker, D16S421, at the 16q22-23 region, showed the highest allelic imbalance, 58%. Tumors with and without AI on 16q were tested for correlation with clinico-pathological features of the tumors such as estrogen- and progesterone-receptor content (ER and PgR), age at diagnosis, tumor size, node status, histological type, S-phase fraction, AI on chromosome 3p, and ploidy. A correlation was found between AI on 16q and high PgR content, also low S-phase fraction (99% confidence limits). A comparison of tumors with and without AI at the D16S421 marker locus revealed a slight correlation with high PgR content. The survival data showed no difference between patients with AI on 16q and those with a normal allele pattern on the long arm of chromosome 16.
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