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and PR and Associated with Nodal Status, Grade, and Proliferation Rate in Breast Cancer


From the Laboratory of Cancer Biology,*
Institute of
Medical Technology, Tampere University and University Hospital,
Tampere; the Medical School,
University of
Tampere, Tampere; and the Department of
Oncology,
Tampere University Hospital,
Tampere, Finland
The role of estrogen (ER) and progesterone receptors (PR) in breast
cancer is well established. Identification of the second human estrogen
receptor, the estrogen receptor ß (ERß), prompted
us to evaluate its role in breast cancer. We studied the expression of
ERß by immunohistochemistry and mRNA in situ
hybridization in 92 primary breast cancers and studied its association
with ER
, PR, and various other clinicopathological
factors. Sixty percent of tumors were defined as ERß-positive
(nuclear staining in >20% of the cancer cells). Normal ductal
epithelium and 5 of 7 intraductal cancers were also found to express
ERß. Three-fourths of the ER
- and PR-positive tumors were positive
for ERß, whereas ER
and PR were positive in 87% and 67%
of ERß-positive tumors, respectively. ERß was associated
with negative axillary node status (P <
0.0001), low grade (P = 0.0003),
low S-phase fraction (P = 0.0003), and
premenopausal status (P = 0.04). In
conclusion, the coexpression of ERß with ER
and PR as well
as its association with the other indicators of low biological
aggressiveness of breast cancer suggest that ERß-positive tumors are
likely to respond to hormonal therapy. The independent predictive value
of ERß remains to be established.
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