1264POVERALL SURVIVAL ANALYSIS OF STAGE IV NON SMALL CELL LUNG CANCER WITH SYNCHRONOUS ISOLATED METASTASIS IN A LARGE RETROSPECTIVE COHORT OF 4935 PATIENTS WITH LUNG CANCER

ABSTRACT Aim: Aim: Stage IV NSCLC is considered as an incurable disease with median survival of approximately 12 months. Palliative platinum based chemotherapy is the standard therapy. It has been suggested that patient with one synchronous isolated metastasis (SIM) suitable for local therapy (LT) have longer survival. Methods: Methods: Database of the Multidisciplinary Thoracic Oncology Group of our centre was retrospectively screened from 1993 to 2012. Consecutive NSCLC of any stage were included. Major prognostic characteristics at diagnosis (gender, age, PS, smoking habit, histology), stage with details of metastatic site and survival follow up should be available. Median overall survival (OS) were compared with log-rank test. Results: 4935 patients were registered, 18 were excluded because of missing data. Among the study population (n = 4917), 36.11% was stage III NSCLC (n = 1769) and 33.02% stage IV (n = 1512). Clinical and histological data differed substantially between each stage. OS was significantly different for any stage compared each other. Among stage IV, 7.27% was SIM (110/1512). SIM site was brain in 64% of cases and adrenal gland in 15% of cases. OS was significantly longer in SIM stage IV compared to non-SIM stage IV (18.8 months [IQR, 9.8-34.6] vs 6.3 months [IQR, 2.4-14.1], respectively, p Conclusions: Conclusion: OS of SIM stage IV is remarkably improved compared to non SIM stage IV, and comparable to stage III. Statistical analysis of survival should be balanced with prognostic covariates. This data support aggressive treatment in the subgroup of SIM stage IV. Disclosure: All authors have declared no conflicts of interest.