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Ref Type Journal Article
PMID (27222538)
Authors Beadnell TC, Mishall KM, Zhou Q, Riffert SM, Wuensch KE, Kessler BE, Corpuz ML, Jing X, Kim J, Wang G, Tan AC, Schweppe RE
Title The Mitogen-Activated Protein Kinase Pathway Facilitates Resistance to the Src Inhibitor Dasatinib in Thyroid Cancer.
Journal Molecular cancer therapeutics
Vol 15
Issue 8
Date 2016 Aug
URL
Abstract Text Advanced stages of papillary and anaplastic thyroid cancer represent a highly aggressive subset, in which there are currently few effective therapies. We and others have recently demonstrated that c-SRC is a key mediator of growth, invasion, and metastasis, and therefore represents a promising therapeutic target in thyroid cancer. However, clinically, Src inhibitor efficacy has been limited, and therefore further insights are needed to define resistance mechanisms and determine rational combination therapies. We have generated four thyroid cancer cell lines with a greater than 30-fold increase in acquired resistance to the Src inhibitor dasatinib. Upon acquisition of dasatinib resistance, the two RAS-mutant cell lines acquired the c-SRC gatekeeper mutation (T341M), whereas the two BRAF-mutant cell lines did not. Accordingly, Src signaling was refractory to dasatinib treatment in the RAS-mutant dasatinib-resistant cell lines. Interestingly, activation of the MAPK pathway was increased in all four of the dasatinib-resistant cell lines, likely due to B-Raf and c-Raf dimerization. Furthermore, MAP2K1/MAP2K2 (MEK1/2) inhibition restored sensitivity in all four of the dasatinib-resistant cell lines, and overcame acquired resistance to dasatinib in the RAS-mutant Cal62 cell line, in vivo Together, these studies demonstrate that acquisition of the c-SRC gatekeeper mutation and MAPK pathway signaling play important roles in promoting resistance to the Src inhibitor dasatinib. We further demonstrate that up-front combined inhibition with dasatinib and MEK1/2 or ERK1/2 inhibitors drives synergistic inhibition of growth and induction of apoptosis, indicating that combined inhibition may overcome mechanisms of survival in response to single-agent inhibition. Mol Cancer Ther; 15(8); 1952-63. ©2016 AACR.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
BRAF V600E thyroid gland cancer sensitive Dasatinib + SCH772984 Preclinical - Cell culture Actionable In a preclinical study, Sprycel (dasatinib) and SCH772984 synergistically inhibited proliferation and induced apoptosis in both parental thyroid cancer cell lines harboring BRAF V600E and those acquired Sprycel (dasatinib)-resistance in culture (PMID: 27222538). 27222538
BRAF V600E thyroid gland cancer sensitive Dasatinib + Selumetinib Preclinical - Cell culture Actionable In a preclinical study, Sprycel (dasatinib) and Koselugo (selumetinib) synergistically inhibited proliferation and induced apoptosis in both parental thyroid cancer cell lines harboring BRAF V600E and those acquired Sprycel (dasatinib)-resistance in culture (PMID: 27222538). 27222538
BRAF V600E thyroid gland cancer sensitive Selumetinib Preclinical - Cell line xenograft Actionable In a preclinical study, Selumetinib (AZD6244) inhibited growth of both parental thyroid cancer cell lines harboring BRAF V600E and those acquired Sprycel (dasatinib)-resistance in culture (PMID: 27222538). 27222538
BRAF V600E thyroid gland cancer predicted - sensitive Trametinib Preclinical - Cell culture Actionable In a preclinical study, Mekinist (trametinib) inhibited growth of both parental thyroid cancer cell lines harboring BRAF V600E and those acquired Sprycel (dasatinib)-resistance in culture (PMID: 27222538). 27222538
BRAF V600E thyroid gland cancer sensitive Dasatinib + Trametinib Preclinical - Cell culture Actionable In a preclinical study, Sprycel (dasatinib) and Mekinist (trametinib) synergistically inhibited proliferation and induced apoptosis in both parental thyroid cancer cell lines harboring BRAF V600E and those acquired Sprycel (dasatinib)-resistance in culture (PMID: 27222538). 27222538