Background and purpose:For patients with advanced lung adenocarcinoma harboring an activating EGFR gene mutation, the current standard of care is EGFR-TKI alone. This study aimed to compare efficacy and safety of gefitinib plus chemotherapy with gefitinib or chemotherapy alone for treating advanced lung adenocarcinoma with an activatingEGFR gene mutation.Methods:This study included 61 patients with lung adenocarcinoma harboring an acti-vatingEGFR gene mutation (19 exons deletion and exon 21 L858R mutations) whose ECOG performance status was 0 or 1. Patients were randomly divided into 3 groups. Group A (n=20) were given carboplatin/pemetrexed of a 4-week cycle, six cycles at most, plus gefitinib (pemetrexed 500 mg/m2, d1; carboplatin AUC 5, d1; gefitinib 250 mg/d, d 5-21), and then re-ceived pemetrexed of a 4-week cycle plus gefitinib as maintenance therapy; Group B (n=20) were given carboplatin/peme-trexed of a 4-week cycle, six cycles at most (pemetrexed 500 mg/m2, d1; carboplatin AUC 5, d1), then received pemetrexed as maintenance therapy; Group C (n=21) were given gefitinib (gefitinib 250 mg/d). Patients continued to receive therapy until disease progression or unacceptable toxicity or death. The primary end point was middle PFS and 12 months PFS rate. The secondary end points included objective response rate and adverse events.Results:Groups A and C both lost 1 case during follow-up. Median PFS for patients was 20.1 months (95%CI:18.0-22.2) in group A, 5.5 months (95%CI:3.9-7.2) in group B, and 9.8 months (95%CI:6.8-12.8) in group C. PFS rates of 12 months for groups A, B and C were 78.9%, 15.0% and 40.0%, respectively. The overall objective response rates for groups A, B and C were 84.2%, 35.0% and 65.0%, respectively. Serious adverse events were reported by 36.8% for group A, 30.0% for group B, and 5.0% for group C. The most common grade 3/4 adverse events were neutropenia (3 cases in group A, 4 cases in group B), fatigue (2 cases in group A, 2 cases in group B) and liver function impairment (2 cases in group A, 1 case in group C).Conclusion:Among patients withEGFR mutant lung adenocarcinoma, combination of chemotherapy with gefitinib as first-line treatment demonstrates an improvement in PFS. Long-term survival results will be further followed up.%背景与目的：表皮生长因子受体(epidermal growth factor receptor，EGFR)敏感突变的晚期肺腺癌患者目前标准一线治疗方案为表皮生长因子受体-酪氨酸激酶抑制剂(epithelial growth factor receptor-tyrosine kinase inhibitor，EGFR-TKI)单药治疗。该研究探索化疗联合吉非替尼与单用化疗、单用吉非替尼在EGFR基因敏感突变的晚期肺腺癌一线治疗中的疗效及安全性比较。方法：本研究共纳入了61例EGFR基因敏感突变(19外显子缺失突变或21外显子L858R点突变)、PS 0～1分的初治晚期肺腺癌患者，并用随机数字法随机分成3组。A组20例，给予AC方案化疗(培美曲塞500 mg/m2，第1天；卡铂AUC 5，第1天)联合口服吉非替尼(250 mg/d，第5~21天)，每4周为1个周期，最多6个周期，然后每4周进行1次培美曲塞单药联合吉非替尼口服(用药方法及剂量同前)维持治疗；B组20例，给予AC方案化疗(培美曲塞500 mg/m2，第1天；卡铂AUC 5，第1天)，每4周为1个周期，最多6个周期，然后每4周进行1次培美曲塞单药维持治疗；C组21例，口服吉非替尼治疗(250 mg/d)。3组的治疗均持续至患者出现疾病进展或出现无法耐受的不良反应或死亡。研究的主要终点为中位无进展生存时间(progression-free survival，PFS)和12个月PFS率，次要终点为总体缓解率、安全性/不良反应。结果：随访中A、C组各失访1例。A组患者中位PFS为20.1个月(95%CI：18.0～22.2个月)，B组患者中位PFS为5.5个月(95%CI：3.9～7.2个月)，C组患者中位PFS为9.8个月(95%CI：6.8～12.8个月)。A组的12个月PFS率为78.9%，B组为15.0%，C组为40.0%。总体缓解率：A组为84.2%，B组为35.0%，C组为65.0%。安全性方面，严重不良反应的发生率A组为36.8%，B组为30.0%，C组为5.0%。最常见的3～4度不良反应为中性粒细胞减少(A组3例、B组4例)、乏力(A组2例、B组2例)及肝功能损害(A组2例、C组1例)。结论：一线接受化疗与吉非替尼联合治疗的EGFR敏感突变的晚期肺腺癌患者PFS更长。长期的生存结果仍在进一步随访中。
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