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Mutational landscape of non-functional adrenocortical adenomas

Luming Wu

Luming Wu Department of Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People’s Republic of China

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Jing Xie

Jing Xie Department of Pathology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People’s Republic of China

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Yan Qi

Yan Qi Department of Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People’s Republic of China

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Tingwei Su

Tingwei Su Department of Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People’s Republic of China

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Lei Jiang

Lei Jiang Department of Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People’s Republic of China

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Weiwei Zhou

Weiwei Zhou Department of Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People’s Republic of China

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Yiran Jiang

Yiran Jiang Department of Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People’s Republic of China

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Cui Zhang

Cui Zhang Department of Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People’s Republic of China

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Xu Zhong

Xu Zhong Department of Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People’s Republic of China

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Yanan Cao

Yanan Cao Department of Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People’s Republic of China

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Weiqing Wang

Weiqing Wang Department of Endocrine and Metabolic Diseases, Shanghai Institute of Endocrine and Metabolic Diseases, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People’s Republic of China
Shanghai National Clinical Research Center for Metabolic Diseases, Key Laboratory for Endocrine and Metabolic Diseases of the National Health Commission of the PR China, Shanghai Key Laboratory for Endocrine Tumor, State Key Laboratory of Medical Genomics, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China

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Adrenal incidentalomas are the most frequent human neoplasms. Recent genomic investigations on functional adrenocortical tumors have demonstrated that somatic mutations in PRKACA and KCNJ5 responsible for the development of adrenocortical adenomas (ACAs) are associated with hypercortisolism and aldosteronism, respectively. Several studies have identified CTNNB1 mutations in ACAs and have been mostly involved in the tumorigenesis of non-functional ACA (NFACA). However, integrated genomic characterization of NFACAs is lacking. In the current study, we utilized pan-genomic methods to comprehensively analyze 60 NFACA samples. A total of 1264 somatic mutations in coding regions among the 60 samples were identified, with a median of 15 non-silent mutations per tumor. Twenty-two NFACAs (36.67%) had genetic alterations in CTNNB1. We also identified several somatic mutations in genes of the cAMP/PKA pathway and KCNJ5. Histone modification genes (KMT2A, KMT2C, and KMT2D) were altered in 10% of cases. Germline mutations of MEN1 and RET were also found. Finally, by comparison of our transcriptome data with those available in the TCGA, we illustrated the molecular characterization of NFACA. We revealed the genetic profiling and molecular landscape of NFACA. Wnt/β-catenin pathway activation as shown ssby nuclear and/or cytoplasmic β-catenin accumulation is frequent, occurring in about one–third of ACA cases. cytochrome P450 enzymes could be markers to reveal the functional status of adrenocortical tumors. These observations strongly suggest the involvement of the Wnt/β-catenin pathway in benign adrenal tumorigenesis and possibly in the regulation of steroid secretion.