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SH2-containing 5'-inositol phosphatase (SHIP2) is a known regulator of insulin function. Genetic knockout of SHIP2 in mice causes mild insulin hypersensitivity and prevents high-fat-diet-induced obesity. SHIP2 also regulates actin remodeling and epidermal growth factor receptor (EGFR) turnover and supports breast cancer; and metastatic growth. To determine the clinical significance of SHIP2 expression in breast cancer and its relationship to relevant oncogenic molecules, SHIP2 expression was determined immunohistochemically in 285 primary breast cancers; 140 ductal carcinomas in situ (DCIS) and 145 invasive carcinomas. Forty-five percent of the specimens showed high SHIP2 levels in cancer cells while only 15% of adjacent normal cells expressed high SHIP2 levels (p < 0.0001). In cancer cells, the risk of SHIP2 overexpression is elevated (a) in women aged < or =50 years (relative risk, RR = 4.13; 95% confidence interval, CI, 2.5-6.9) compared to women aged >50 years (RR = 2.37; 95% CI 1.6-3.5; p = 0.0003), and (b) in invasive carcinomas (RR = 3.52; 95% CI 2.3-5.5) compared with DCIS (RR = 2.22; 95% CI 1.5-3.5; p = 0.0009). Patients with higher SHIP2 levels in invasive carcinomas had significantly reduced disease-free (p = 0.0025) and overall survival periods (p = 0.0228). In invasive carcinomas, SHIP2 correlated with estrogen receptor absence (p = 0.003) and EGFR presence (p = 0.0147). In conclusion, SHIP2 is an important biomarker for breast cancer.

Original publication

DOI

10.1159/000172970

Type

Journal article

Journal

Tumour Biol

Publication Date

2008

Volume

29

Pages

330 - 341

Keywords

Adult, Aged, Aged, 80 and over, Biomarkers, Tumor, Blotting, Western, Breast Neoplasms, Carcinoma, Ductal, Breast, Carcinoma, Intraductal, Noninfiltrating, Case-Control Studies, Female, Humans, Immunoenzyme Techniques, Middle Aged, Neoplasm Invasiveness, PTEN Phosphohydrolase, Phosphatidylinositol-3,4,5-Trisphosphate 5-Phosphatases, Phosphoric Monoester Hydrolases, Prognosis, Survival Rate, src Homology Domains