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Targeted Therapy Resistance Mediated by Dynamic Regulation of Extrachromosomal Mutant EGFR DNA (Science 3 January 2014)
2014-10-19 15:10 written by ercsb (2024-06-14 05:00 Modify)
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Targeted Therapy Resistance Mediated by Dynamic Regulation of Extrachromosomal Mutant EGFR DNA


Intratumoral heterogeneity contributes to cancer drug resistance, but the underlying mechanisms are not understood. Single-cell analyses of patient-derived models and clinical samples from glioblastoma patients treated with epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKIs) demonstrate that tumor cells reversibly up-regulate or suppress mutant EGFR expression, conferring distinct cellular phenotypes to reach an optimal equilibrium for growth. Resistance to EGFR TKIs is shown to occur by elimination of mutantEGFR from extrachromosomal DNA. After drug withdrawal, reemergence of clonal EGFR mutations on extrachromosomal DNA follows. These results indicate a highly specific, dynamic, and adaptive route by which cancers can evade therapies that target oncogenes maintained on extrachromosomal DNA.


Editor's summary

Playing Hide and Seek

Targeted cancer therapies have shown promising results in patients, but few of these drugs provide long-term benefits because tumor cells rapidly develop drug resistanceNathanson et al. (p. 72, published online 5 December) show that glioblastoma cells can become resistant to erlotinib, an epidermal growth factor receptor (EGFR)–targeted drug, by eliminating extrachromosomal copies of the mutant EGFR gene. After a period of drug withdrawal, the mutant EGFR gene reappears on extrachromosomal DNA and the tumor cells become resensitized. The discovery that cancer cells can evade drug therapy by this “hide and seek” mechanism may help to optimize the dosing schedule of erlotinib in glioblastoma patients.





Joan (rol9l5409il@hotmail.com ) / 2016 07-09 11:55
i cannot believe this!! but hmm i think id b a good thing if half the bad stuff we have out there shut down than maybe i can shed a few lbs haha.. i prefer to cook my meals so i dont think it#&39;d bother me much