EGFR-mutated advanced lung cancer. Data from a single institution, the Hospital of Leon, in Spain.

INTRODUCTION: 10-16% of non-small cell lung cancer (NSCLC) cases have the epidermal growth factor receptor (EGFR) amplified and/or mutated. Studies show that EGFR tyrosine kinase inhibitors (TKIs) significantly prolong progression-free survival (PFS) in patients with advanced NSCLC compared to those treated with platinum-based chemotherapy (CT) doublets. Our aim is to perform a real-world survival analysis of patients treated with TKI as first-line therapy at the Hospital of Leon (CAULE) in Spain. The impact on global survival rates and responses to clinical and histopathological factors were also analyzed. MATERIAL AND METHODS: We retrospectively reviewed patients diagnosed with EGFR-mutated NSCLC who received treatment with EGFR-TKI in the Department of Oncology at the University of Leon Health Center complex between March 2011 and June 2018. Data was analyzed with Kaplan-Meier and Cox regression models to show overall survival (OS), progression-free survival (PFS), and the associated variables. RESULTS: 53 patients were included in the study, 50% (n = 27) were treated with gefitinib, 32% (n = 18) with erlotinib and 10% (n = 6) with afatinib. The median OS and PFS were 27.7 months (95% CI: 21-33.8 months) and 18 months (95% CI 14.25-21.89 months), respectively. The variables associated with OS and with PFS were exon19 deletion as a protective factor and presence of extrathoracic metastasis as a risk factor. The most frequent adverse effects were rash, diarrhea, asthenia, and conjunctivitis. CONCLUSIONS: Real-world analysis of this data confirms that treatment with TKI is beneficial for patients diagnosed with EGFR-mutated NSCLC. Our OS outcomes were similar to those reported in clinical trials.