JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
REVIEW
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Mechanisms and strategies to overcome resistance to molecularly targeted therapy for melanoma.

Cancer 2017 June 2
The identification of driver mutations in melanoma has changed the field of cancer treatment. BRAF and NRAS mutations are predominant in melanoma and lead to overactivation of the mitogen-activated protein kinase (MAPK) and phosphatidylinositol 3-kinase (PI3K)/protein kinase B (AKT) signaling pathways. Selective inhibitors targeting key effectors of the MAPK pathway have revolutionized the treatment of patients with advanced metastatic BRAF-mutant melanoma. However, resistance to therapy is almost universal and remains a major challenge in clinical care, with the majority of patients progressing within 1 year. Dissecting the mechanisms of resistance to targeted therapies may offer new insights into strategies for overcoming resistance. This review describes the efficacy of therapies targeting the MAPK and PI3K/AKT signaling pathways in melanoma, details the mechanisms contributing to drug resistance, and discusses current approaches to improving outcomes further. Cancer 2017;123:2118-29. © 2017 American Cancer Society.

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