LAUSR

e20507Background: The incidence and prognosis associated with patients undergoing sub-lobar resections and having positive lymph nodes(PLN) has been rarely studied. Our investigation will retrospectively review this topic. Methods: The National Cancer Database(NCDB) was queried during the years 2004-2014 to assess patients undergoing sub-lobar resection (wedge, segmentectomy, and sub-lobar-NOS, N = 24,421) and specifically the patients with PLN (N = 3,220). Patients were excluded who had any pre-op chemotherapy and/or radiation, had follow-up of less than 3 months, had stage IV disease or > 1 tumor nodule. Multi-variable modeling(MVA) was used to determine factors for overall survival (OS). Propensity score matching(PSM) was used to determine pre-operative risk factors for PLN in patients having at least one node examined (matched by median number of nodes examined) and to assess the role of radiation in those patients with node positive disease (matched by age, sex, stage, chemotherapy, and number of nod...