Evaluation of a displacement assay with tamoxifen as prognostic indicator in breast-cancer patients with estrogen-receptor-positive tumors.

Abstract:

:A displacement assay with tamoxifen, based on the relative binding affinity of tamoxifen and estradiol for the estrogen receptor (ER), was proposed in 1990 as prognostic indicator for breast-cancer patients. Validation of its predictive results in relation to the outcome of 73 patients with ER+ tumors is analyzed. ER, progesterone receptor (PgR) determinations and other conventional prognostic factors in relation to the displacement assay, were considered. Displacement assay results allowed ER+ tumors to be grouped as displaceable (D) or weakly displaceable (WD), with the implication that D tumors should respond better to tamoxifen (Tam) administration. Survival and disease-free interval curves showed highly significant differences between patients with ER+ D and ER+ WD tumors. For survival, including all tumor stages, 73.9% of patients were alive at 9 years after surgery in the group with D tumors and 37.0% in the group with WD tumors (p < 0.005); relative contribution of the different stages is analyzed. Addition of axillary-node number increased the prognostic significance of displacement categories for survival and disease-free interval. PgR determination as another ER functional expression failed to show significant differences for survival and disease-free interval between ER+ PgR+ and ER+ PgR- tumors. Thus, results from the displacement assay and from PgR determinations reflect 2 independent ER functional expressions. Displacement assay data appear as reliable prognostic indicators of breast-cancer outcome, and contribute to more appropriate treatment decisions in this pathology.

journal_name

Int J Cancer

authors

Levin E,Actis AM,Caruso S,Gass H,Romero R,Qualeta N,Levin RW

doi

10.1002/(sici)1097-0215(19971114)73:4<486::aid-ijc

subject

Has Abstract

pub_date

1997-11-14 00:00:00

pages

486-91

issue

4

eissn

0020-7136

issn

1097-0215

pii

10.1002/(SICI)1097-0215(19971114)73:4<486::AID-IJC

journal_volume

73

pub_type

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