e20635 Background:Metastatic lung cancer with systemic chemotherapy has a median progression-free survival (PFS) of 5-6 months and median overall survival time (OS) of around 12 months. In Epidermal Growth Factor Receptor gene (EGFR) mutated metastatic lung cancer the use of EGFR Tyrosine Kinase Inhibitors (EGFR-TKIs) has increased the median PFS to12 months and the median OS to 30 months. The objective of this study is to evaluate the response to TKIs in EGFR mutated metastatic lung cancer in racially diverse inner city population with high smoking rates. Methods:Consecutive patients diagnosed with EGFR mutant metastatic lung adenocarcinoma and treated with TKIs in John H. Stroger Jr. Hospital of Cook County in Chicago, IL between January 2009 to June 2016 were retrospectively evaluated. Demographic data was collected and PFS and OS were analyzed. Results:35 patients with EGFR mutated metastatic lung cancer received EGFR-TKI during the study period. There was a female preponderance (63%). Hispanics formed the most common racial group (37%), followed by Asians (26%), African Americans (AA) (20%) and Caucasians (17%). Mean age of diagnosis of metastatic disease was 56.5± 11.5 years. 20% of the patients were ever smokers. Stage 4 disease at presentation was seen in 88.6 %. Sites of metastatic disease included lungs/pleura (60%), bone (60%), brain (22.9%) and liver (14.3%). 82.9% had TKI as first line treatment. Median PFS and OS were 9.89 (95% CI: 7.8-11.9) months and 19.3 (95% CI: 1.9-36.8) months respectively. The median PFS and OS were 12.88 and 17 months for Asians, 10.8 and 24.4 months for Caucasians and 9.2 and 33 months for Hispanics respectively. Among AA, PFS at 19 months and OS at 35 months was 0.58%, not reaching the median. Patients who continued to smoke had a median OS of 8.5 months vs 19.3 months in nonsmokers/ex-smokers. Conclusions: In an underserved population, patients treated with EGFR mutated metastatic lung adenocarcinoma with EGFR-TKI have similar survival compared previously known data. Race of the patient does not appear to alter response to EGFR-TKI therapy. Active smokers had a lower OS. Studies in minority populations with larger samples are required to further validate the above findings.
Five-Year Survival in EGFR -Mutant Metastatic Lung Adenocarcinoma Treated with EGFR-TKIs
