| Summary: | Jing Liu,* Ligang Xing,* Xue Meng, Jinbo Yue, Xiangjiao Meng, Peng Xie, Xiaolin Li, Li Kong, Jinming YuDepartment of Radiation Oncology, Shandong Province Key Laboratory of Radiation Oncology, Shandong Cancer Hospital and Institute, Shandong University, Jinan, People’s Republic of China*These authors contributed equally to this workPurpose: Brain metastasis (BM) is associated with impaired quality of life and increased mortality. The study aimed to compare BM risk after erlotinib administration and chemotherapy in stage IIIB/IV pulmonary adenocarcinoma patients harboring epidermal growth factor receptor (EGFR) mutation.Patients and methods: Eligible patients underwent match pair process with matching factors, including age, sex, performance status score, first-line or second-line treatment, first-line chemotherapy regimen (for the second-line treatment subgroup), stage IIIB or IV, and genotypes of EGFR mutation. BM and mortality risk of both groups were recorded and compared.Results: In total 129 matched pairs were included for analysis. During a median follow-up of 21.5 months, time to BM risk was longer and incidences of BM within 2 years were lower in patients who received erlotinib than chemotherapy in total population, as well as subgroups of first-line treatment, second-line treatment, stage IIIB, stage IV, exon 19 deletion mutation, and exon 21 L858R mutation. Similar overall survival time and 2-year survival rates were seen in two groups totally or in any subgroup. Multivariate analysis showed that BM was retarded in patients who received erlotinib administration (hazard ratio, 1.695; P=0.001) and in patients who were in stage IIIB (hazard ratio, 1.751; P=0.001).Conclusion: Erlotinib administration decreases BM risk in advanced pulmonary adenocarcinoma patients harboring sensitive EGFR mutations.Keywords: pulmonary adenocarcinoma, brain metastasis, epidermal growth factor receptor, erlotinib, match pair analysis
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