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- _4 value "show a good clinical response to EGFR TKIs such as gefitinib, but they almost invariably develop drug resistance after an average of 12 months5. A secondary mutation in exon 20 (T790M) is found in about half of patients with a primary mutation that have grown resistant after an initial response to EGFR TKIs6?8. More recently, a new secondary mutation (D761Y) was found in a brain metastasis of a lung cancer initially responsive to gefitinib9. So far, T790M and D761Y are the only acquired alterations identified in the EGFR associated with escape from TKI therapy." provenance.
- _4 wasQuotedFrom 17554333 provenance.