American Association for Cancer Research
10780432ccr123173-sup-fig2.pdf (70.79 kB)

Supplementary Figure 2 from Characteristics of Lung Cancers Harboring NRAS Mutations

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posted on 2023-03-31, 17:22 authored by Kadoaki Ohashi, Lecia V. Sequist, Maria E. Arcila, Christine M. Lovly, Xi Chen, Charles M. Rudin, Teresa Moran, David Ross Camidge, Cindy L. Vnencak-Jones, Lynne Berry, Yumei Pan, Hidefumi Sasaki, Jeffrey A. Engelman, Edward B. Garon, Steven M. Dubinett, Wilbur A. Franklin, Gregory J. Riely, Martin L. Sos, Mark G. Kris, Dora Dias-Santagata, Marc Ladanyi, Paul A. Bunn, William Pao

PDF file - 70K, Figure S2. Effect of a MEK inhibitor against HCC15 cells in combination with either a MET or IGF-1R inhibitor. A. The combination of SGX-523 and trametinib did not inhibit cell growth in HCC15 cells. B. The combination of linsitiniband trametinib showed a greater effect than either drug alone. We used linsitinib because we previously reported that HCC15 cells harbor high levels of IGF-1R (36).



Purpose: We sought to determine the frequency and clinical characteristics of patients with lung cancer harboring NRAS mutations. We used preclinical models to identify targeted therapies likely to be of benefit against NRAS-mutant lung cancer cells.Experimental Design: We reviewed clinical data from patients whose lung cancers were identified at six institutions or reported in the Catalogue of Somatic Mutations in Cancer (COSMIC) to harbor NRAS mutations. Six NRAS-mutant cell lines were screened for sensitivity against inhibitors of multiple kinases (i.e., EGFR, ALK, MET, IGF-1R, BRAF, PI3K, and MEK).Results: Among 4,562 patients with lung cancers tested, NRAS mutations were present in 30 (0.7%; 95% confidence interval, 0.45%–0.94%); 28 of these had no other driver mutations. 83% had adenocarcinoma histology with no significant differences in gender. While 95% of patients were former or current smokers, smoking-related G:C>T:A transversions were significantly less frequent in NRAS-mutated lung tumors than KRAS-mutant non–small cell lung cancer [NSCLC; NRAS: 13% (4/30), KRAS: 66% (1772/2733), P < 0.00000001]. Five of 6 NRAS-mutant cell lines were sensitive to the MEK inhibitors, selumetinib and trametinib, but not to other inhibitors tested.Conclusion:NRAS mutations define a distinct subset of lung cancers (∼1%) with potential sensitivity to MEK inhibitors. Although NRAS mutations are more common in current/former smokers, the types of mutations are not those classically associated with smoking. Clin Cancer Res; 19(9); 2584–91. ©2013 AACR.

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