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Osimertinib for the treatment of patients with EGFR mutation-positive non-small cell lung cancer

机译:Osimertinib用于治疗EGFR突变阳性非小细胞肺癌的患者

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Epidermal growth factor receptor (EGFR) mutations, mostly seen in exon 19 or exon 21, are present in roughly 50% of patients with advanced non-small cell lung cancer (NSCLC) of Asian ethnicity compared with 12% in Caucasians. EGFR-mu toted NSCLC patients have an increased sensitivity to EGFR tyrosine kinase inhibitors (TKIs), such as erlotinib, gefitinib or afatinib, showing superior response, progression-free survival and overall survival rates with EGFR-TKIs than with platinum doublet chemotherapy, which makes EGFR-TKIs the standard of care in this subgroup of NSCLC patients. This has been the most important step toward molecular-guided precision therapy for NSCLC. Despite the initial rapid and durable clinical responses, acquired resistance to EGFR-TKIs has been found to eventually develop in most cases, with disease progression observed mostly within 9-12 months after treatment. One of the most important mechanisms for resistance to EGFR-TKI therapy is the substitution of threonine to methionine (T790M) on exon 20 of the EGFR gene, which occurs in 49% to 60% of patients. Osimertinib mesylate (formerly AZO-9291) is a potent third-generation TKI which irreversibly inhibits mutated EGFR alleles, including T790M. This review summarizes osimertinib's pharmacology, pharmacokinetics, safety, side effects and clinical utility in the treatment of EGFR-mutated advanced NSCLC.
机译:表皮生长因子受体(EGFR)突变主要见于外显子19或外显子21,在亚裔晚期非小细胞肺癌(NSCLC)患者中约有50%存在这种突变,而在白种人中只有12%。EGFR-mu-toted NSCLC患者对EGFR酪氨酸激酶抑制剂(TKIs)的敏感性增加,如厄洛替尼、吉非替尼或阿法替尼,与铂双联化疗相比,EGFR-TKIs显示出更好的反应、无进展生存率和总生存率,这使得EGFR-TKIs成为该亚组NSCLC患者的标准治疗。这是NSCLC分子导向精确治疗最重要的一步。尽管最初的临床反应迅速而持久,但已发现大多数病例最终会产生对EGFR-TKIs的获得性耐药性,大多数患者在治疗后9-12个月内观察到疾病进展。对EGFR-TKI疗法产生耐药性的最重要机制之一是,EGFR基因外显子20上的苏氨酸替换为蛋氨酸(T790M),49%到60%的患者出现这种情况。甲磺酸欧西美替尼(以前称为AZO-9291)是一种有效的第三代TKI,可不可逆地抑制突变的EGFR等位基因,包括T790M。本文综述了奥西米替尼治疗EGFR突变晚期非小细胞肺癌的药理学、药代动力学、安全性、副作用和临床应用。

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