Identification of anaplastic lymphoma kinase as a potential therapeutic target in ovarian cancer

Cancer Research
Hong RenMichael J Comb

Abstract

Ovarian cancer is the leading cause of death from gynecologic cancer. Improvement in the clinical outcome of patients is likely to be achieved by the identification of molecular events that underlie the oncogenesis of ovarian cancer. Here we show that the anaplastic lymphoma kinase (ALK) is aberrantly activated in ovarian cancer. Using an unbiased and global phosphoproteomic approach, we profiled 69 Chinese primary ovarian tumor tissues and found ALK to be aberrantly expressed and phosphorylated in 4 tumors. Genetic characterization of these ALK-positive tumors indicated that full-length ALK expression in two serous carcinoma patients is consistent with ALK gene copy number gain, whereas a stromal sarcoma patient carries a novel transmembrane ALK fusion gene: FN1-ALK. Biochemical and functional analysis showed that both full-length ALK and FN1-ALK are oncogenic, and tumors expressing ALK or FN1-ALK are sensitive to ALK kinase inhibitors. Furthermore, immunohistochemical analysis of ovarian tumor tissue microarray detected aberrant ALK expression in 2% to 4% serous carcinoma patients. Our findings provide new insights into the pathogenesis of ovarian cancer and identify ALK as a potential therapeutic target in a subset of serous...Continue Reading

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