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Clinical Trial
. 2010 Jan;11(1):1-9.
doi: 10.1631/jzus.B0900295.

Fractionated evaluation of immunohistochemical hormone receptor expression enhances prognostic prediction in breast cancer patients treated with tamoxifen as adjuvant therapy

Affiliations
Clinical Trial

Fractionated evaluation of immunohistochemical hormone receptor expression enhances prognostic prediction in breast cancer patients treated with tamoxifen as adjuvant therapy

Ching-hung Lin et al. J Zhejiang Univ Sci B. 2010 Jan.

Abstract

Objective: To compare the prognostic prediction between dichotomized and fractionated evaluations of hormone receptor expressions.

Methods: Patients with stages I-III breast cancers, who received adjuvant tamoxifen, were enrolled. The expression of estrogen receptor (ER) and progesterone receptor (PR) was evaluated by immunohistochemistry (IHC). A fractionated score (F score), the percentage of positive-staining nuclei (0=none, 1=1%-10%, 2=11%-30%, 3=31%-50%, 4=51%-70%, and 5=71%-100%), was assigned to each case. The dichotomized scoring method defines an F score >1 as positive. The prognostic values of both scores were compared by multiple Cox's proportional hazard models of disease-free survival (DFS) and overall survival (OS).

Results: Four hundred and sixteen patients with a median follow-up of 78.0 months were included. F scores for ER and PR correlated directly with DFS and OS. Although both the dichotomized and fractionated ER and PR scores were significantly associated with DFS and OS in univariate analyses, only fractionated ER and PR scores remained as independent prognostic factors of DFS and OS in the final multiple Cox's proportional hazard models.

Conclusion: Fractionated IHC hormone receptor expression evaluation enhances the prognostic prediction compared with a dichotomized assessment.

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Figures

Fig. 1
Fig. 1
Representative immunohistochemical image of each fractionated score (F score) of estrogen receptor (ER). F scores 0 (a), 1 (b), 2 (c), 3 (d), 4 (e), and 5 (f) were shown
Fig. 1
Fig. 1
Representative immunohistochemical image of each fractionated score (F score) of estrogen receptor (ER). F scores 0 (a), 1 (b), 2 (c), 3 (d), 4 (e), and 5 (f) were shown
Fig. 1
Fig. 1
Representative immunohistochemical image of each fractionated score (F score) of estrogen receptor (ER). F scores 0 (a), 1 (b), 2 (c), 3 (d), 4 (e), and 5 (f) were shown
Fig. 1
Fig. 1
Representative immunohistochemical image of each fractionated score (F score) of estrogen receptor (ER). F scores 0 (a), 1 (b), 2 (c), 3 (d), 4 (e), and 5 (f) were shown
Fig. 1
Fig. 1
Representative immunohistochemical image of each fractionated score (F score) of estrogen receptor (ER). F scores 0 (a), 1 (b), 2 (c), 3 (d), 4 (e), and 5 (f) were shown
Fig. 1
Fig. 1
Representative immunohistochemical image of each fractionated score (F score) of estrogen receptor (ER). F scores 0 (a), 1 (b), 2 (c), 3 (d), 4 (e), and 5 (f) were shown
Fig. 2
Fig. 2
Disease-free (a) and overall (b) survival curves (unadjusted analysis) by estrogen receptor (ER) and progesterone receptor (PR) IHC score
Fig. 2
Fig. 2
Disease-free (a) and overall (b) survival curves (unadjusted analysis) by estrogen receptor (ER) and progesterone receptor (PR) IHC score
Fig. 3
Fig. 3
Covariate-adjusted survival curves for disease-free survival (DFS) time based on a fitted multiple Cox’s proportional hazard model (n=416)

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