Progranulin (GP88) tumor tissue expression is associated with increased risk of recurrence in breast cancer patients diagnosed with estrogen receptor positive invasive ductal carcinoma

Ginette Serrero, Douglas M. Hawkins, Binbin Yue, Olga Ioffe, Pablo Bejarano, Jeffrey T. Phillips, Jonathan F. Head, Robert L. Elliott, Katherine R. Tkaczuk, Andrew K. Godwin, Jo Ellen Weaver, Wes E. Kim

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45 Scopus citations

Abstract

Introduction: GP88 (progranulin) has been implicated in tumorigenesis and resistance to anti-estrogen therapies for estrogen receptor positive (ER +) breast cancer. Previous pathological studies showed that GP88 is expressed in invasive ductal carcinoma (IDC), but not in normal mammary epithelial tissue, benign lesions or lobular carcinoma. Based on these results, the present study examines GP88 prognostic significance in association with recurrence and death risks for ER + IDC patients.Methods: Two retrospective multi-site clinical studies examined GP88 expression by immunohistochemistry (IHC) analysis of paraffin-embedded breast tumor tissue sections from ER + IDC patients (lymph node positive and negative, stage 1 to 3) in correlation with patients' survival outcomes. The training study established a GP88 cut-off value associated with decreased disease-free (DFS) and overall (OS) survivals. The validation study verified the GP88 cut-off value and compared GP88 prognostic information with other prognostic factors, particularly tumor size, grade, disease stage and lymph node status in multivariate analysis.Results: GP88 expression is associated with a statistically significant increase in recurrence risk for ER + IDC patients. The training study established that GP88 3+ score was associated with decreased DFS (P = 0.0004) and OS (P = 0.0036). The independent validation study verified that GP88 3+ score was associated with a 5.9-fold higher hazard of disease recurrence and a 2.5-fold higher mortality hazard compared to patients with tumor GP88 < 3+. GP88 remained an independent risk predictor after considering age, ethnicity, nodal status, tumor size, tumor grade, disease stage, progesterone receptor expression and treatments.Conclusions: The survival factor GP88 is a novel prognostic biomarker, predictive of recurrence risk and increased mortality for non-metastatic ER + IDC patients. Of importance, our data show that GP88 continues to be a prognostic factor even after five years. These results also provide evidence that GP88 provides prognostic information independent of tumor and clinical characteristics and would support prospective study to examine whether GP88 expression could help stratify patients with ER + tumors for adjuvant therapy.

Original languageEnglish (US)
Article numberR26
JournalBreast Cancer Research
Volume14
Issue number1
DOIs
StatePublished - Feb 8 2012

Bibliographical note

Funding Information:
The authors wish to thank David Hicks for his help with figure preparation, and the Cooperative Breast Cancer Tissue Resources of the National Cancer Institute for providing multi-center breast cancer cases for the training study. This work was supported by grants 1R43CA124179, 2R44CA124179, and U01CA113916 from the National Cancer Institute and 07-2007-064 and 02-2010-010 from the Avon Foundation.

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