Abstract
Recent studies have identified a role for insulin receptor substrate-2 (IRS-2) in promoting motility and metastasis in breast cancer. However, no published studies to date have examined IRS-2 expression in human breast tumors. We examined IRS-2 expression by immunohistochemistry (IHC) in normal breast tissue, benign breast lesions, and malignant breast tumors from the institutional pathology archives and a tumor microarray from a separate institution. Three distinct IRS-2 staining patterns were noted: diffusely cytoplasmic, punctate cytoplasmic, and localized to the cell membrane. The individual and pooled datasets were analyzed for associations of IRS-2 staining pattern with core clinical parameters and clinical outcomes. Univariate analysis revealed a trend toward decreased overall survival (OS) with IRS-2 membrane staining, and this association became significant upon multivariate analysis (P = 0.01). In progesterone receptor negative (PR−) tumors, in particular, IRS-2 staining at the membrane correlated with significantly worse OS than other IRS-2 staining patterns (P < 0.001). When PR status and IRS-2 staining pattern were evaluated in combination, PR− tumors with IRS-2 at the membrane were associated with a significantly decreased OS when compared with all other combinations (P = 0.002). Evaluation of IRS-2 staining patterns could potentially be used to identify patients with PR− tumors who would most benefit from aggressive treatment.
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Acknowledgments
This study was supported by National Institute of Health (NIH) grants CA090583 and CA142782 (LMS); Department of Defense Synergistic Idea Award W81XWH-07-1-0599 (LMS and AK); National Institute of Health grants CA125577, CA107469, and CA154224 (CGK); and Department of Defense Breast Cancer Predoctoral Fellowship W81XWH-10-1-0038 (JLC). LMS is a member of the University of Massachusetts Diabetes and Endocrinology Research Center (DERC) (DK32520) and the University of Massachusetts Memorial Cancer Center of Excellence. We thank Dr. Qin Liu at the University of Massachusetts Medical School for her advice on statistical analysis.
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10549_2011_1353_MOESM2_ESM.pdf
Supplemental Fig. 1 Analysis of IRS-2 diffuse staining pattern, progesterone receptor status, and overall survival. a, c, e Kaplan–Meier survival curves showing overall survival (OS) in Set 1 (a), Set 2 (c), and the Pooled Set (e) for patients with tumors exhibiting IRS-2 diffuse staining compared with non-diffuse IRS-2 staining. P values for both univariate and multivariate analyses are shown. b, c, f Kaplan–Meier survival curves showing OS in tumors from Set 1 (b), Set 2 (d), and the Pooled Set (f) as a function of both progesterone receptor (PR) and IRS-2 diffuse staining status. P values based on univariate analysis. (PDF 21 kb)
10549_2011_1353_MOESM3_ESM.pdf
Supplemental Fig. 2 Analysis of IRS-2 punctate staining pattern, progesterone receptor status, and overall survival. a, c, e Kaplan–Meier survival curves showing overall survival (OS) in Set 1 (a), Set 2 (c), and the Pooled Set (e) for patients with tumors exhibiting IRS-2 punctate staining compared with non-punctate IRS-2 staining. P values for both univariate and multivariate analyses are shown. b, c, f Kaplan–Meier survival curves showing OS in tumors from Set 1 (b), Set 2 (d), and the Pooled Set (f) as a function of both progesterone receptor (PR) and IRS-2 punctate staining status. P values based on univariate analysis. (PDF 21 kb)
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Clark, J.L., Dresser, K., Hsieh, CC. et al. Membrane localization of insulin receptor substrate-2 (IRS-2) is associated with decreased overall survival in breast cancer. Breast Cancer Res Treat 130, 759–772 (2011). https://doi.org/10.1007/s10549-011-1353-1
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DOI: https://doi.org/10.1007/s10549-011-1353-1