Data from Ribonucleotide Reductase Large Subunit (<i>RRM1</i>) Gene Expression May Predict Efficacy of Adjuvant Mitotane in Adrenocortical Cancer

Abstract

<div>Abstract<p><b>Purpose:</b> Mitotane is the most broadly used systemic therapy for adrenocortical carcinoma (ACC), but its mechanism of action and possible predictors of treatment response are currently poorly defined. Our aim was to evaluate the gene expression of ribonucleotide reductase large subunit 1 (RRM1) and excision repair cross-complementation group 1 (ERCC1) in ACC as potential biomarkers for clinical outcome and response to mitotane.</p><p><b>Experimental Design:</b> Forty-five and 47 tissue samples from two cohorts (Orbassano, Italy; Wuerzburg, Germany) of completely resected ACC were centrally analyzed using real-time PCR for RRM1 and ERCC1 expression. Fifty-four patients received surgery alone and 38 received adjuvant mitotane after surgery. Clinical and pathologic features were highly comparable in the two series. H295R and SW-13 ACC cell lines were also used for pharmacologic tests.</p><p><b>Results:</b><i>ERCC1</i> gene expression was not associated to clinical outcome. In contrast, high <i>RRM1</i> gene expression was associated to shorter disease-free survival (DFS) and overall survival at both univariate and multivariate analysis. In patients with low <i>RRM1</i> gene expression, adjuvant mitotane was associated with improved DFS, whereas this effect was lost in cases with high RMM1 expression. <i>In vitro</i> mitotane induced strong up regulation of RRM1 transcription (up to 25-fold increase) in mitotane-insensitive SW-13 but not in mitotane-sensitive H295R cells. Furthermore, RRM1 silencing in SW-13 cells induced sensitivity to mitotane.</p><p><b>Conclusion:</b> Our <i>in vitro</i> and <i>in vivo</i> data indicate that <i>RRM1</i> gene expression is functionally associated to mitotane sensitivity and support a possible role of RRM1 determination as a novel molecular biomarker predicting response to adjuvant mitotane in ACC. <i>Clin Cancer Res; 18(12); 3452–61. ©2012 AACR</i>.</p></div>