Abstract:
:Southern analysis has shown that DNA from 25% of primary estrogen receptor (ER) alpha-negative breast tumors displays aberrant methylation at one site within the ER gene CpG island. To examine more sites and increase sensitivity, we developed a methylation-specific PCR assay to map methylation of the entire ER CpG island. The island was unmethylated in normal breast tissue and ER-positive breast cancer cell lines, but extensively methylated in all ER-negative cell lines and breast tumors examined. In addition, some of the ER-positive/progesterone receptor-negative and ER-positive/progesterone receptor-positive tumors (about 70% and 35%, respectively) displayed methylation of the ER CpG island, suggesting that this heterogeneity within tumor cell populations could potentially shed light on the etiology of ER-negative recurrent tumors arising from ER-positive tumors.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Lapidus RG,Nass SJ,Butash KA,Parl FF,Weitzman SA,Graff JG,Herman JG,Davidson NEsubject
Has Abstractpub_date
1998-06-15 00:00:00pages
2515-9issue
12eissn
0008-5472issn
1538-7445journal_volume
58pub_type
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