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Title: Prognostic Significance of Gremlin1 (GREM1) Promoter CpG Island Hypermethylation in Clear Cell Renal Cell Carcinoma
Authors: van Vlodrop, Iris J. H ×
Baldewijns, Marcella M. L
Smits, Kim M
Schouten, Leo J
van Neste, Leander
van Criekinge, Wim
Van Poppel, Hendrik
Lerut, Evelyne
Schuebel, Kornel E
Ahuja, Nita
Herman, James G.
de Bruine, Adriaan P
van Engeland, Manon #
Issue Date: Feb-2010
Publisher: Amer soc investigative pathology, inc
Series Title: American journal of pathology vol:176 issue:2 pages:575-584
Abstract: Gremlin1 (GREM1), a bone morphogenetic protein antagonist and putative angiogenesis-modulating gene, is silenced by promoter hypermethylation in human malignancies. Here we study GREM1 methylation in clear cell renal cell carcinoma (ccRCC) and its impact on tumor characteristics and clinical outcome. Three GREM1 promoter CpG island regions (i, ii, iii) were analyzed by methylation-specific PCR and/or bisulfite sequencing in ccRCC cell lines and ccRCCs from two independent patient series. Results were correlated with clinicopathological and angiogenic parameters. Bisulfite sequencing of ccRCC cell lines showed GREM1 methylation, associated with absence of GREM1 mRNA. GREM1 methylation prevalence in ccRCCs varied between regions: 55%, 24%, and 20% for regions i, ii, and iii, respectively. GREM1 region iii methylation was associated with increased tumor size (P = 0.02), stage (P = 0.013), grade (P = 0.04), tumor (P = 0.001), and endothelial cell (P = 0.0001) proliferation and decreased mean vessel density (P = 0.001) in a hospital-based ccRCC series (n = 150). In univariate analysis, GREM1 region iii methylated ccRCCs had a significant worse survival when compared with unmethylated ccRCCs (hazard ratio [HR] = 2.35, 95% confidence interval [CI]:1.29 to 4.28), but not in multivariate analysis (HR = 0.88, 95% Cl: 0.45 to 1.74). In a population-based validation series (n = 185), GREM1 region iii methylation was associated with increased Fuhrman grade (P = 0.03) and decreased overall survival (P = 0.001) in univariate and multivariate analysis (HR = 2.32, 95% CI: 1.52 to 3.53 and HR = 2.27, 95% Cl: 1.44 to 3.59, respectively). The strong correlation between GREM1 region iii promoter methylation and increased malignancy and its correlation with active angiogenesis indicates a role for GREM1 in ccRCC carcinogenesis and tumor angiogenesis. (Am J Pathol 2010, 176:575-584; DOI: 10.2353/ajpath.2010.090442)
ISSN: 0002-9440
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Urology Section (-)
Translational Cell & Tissue Research
× corresponding author
# (joint) last author

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