Use Of Clinical Classification Software To Differentiate Good Versus Poor Prognostic Patients With Ovarian Cancer: A Seer-Medicare Database Analysis From The Viera Study.

e18069 Background: Historically, recurrence in ovarian cancer (OC) following first-line (1L) chemotherapy (CT) occurs in up to 80% of patients within 2 years. The Clinical Classification Software (CCS) systematically classifies thousands of ICD-9 codes into a smaller number of clinically meaningful categories. We sought to use CCS and other routinely collected variables to differentiate the clinical and demographic profiles of patients with good prognosis (GP) versus poor prognosis (PP) in the United States (US). Methods: This was a retrospective cohort study of newly diagnosed (FIGO stage II - IV), treatment-naïve patients, ≥ 66 years, who received 4-10 cycles of platinum-based 1L CT between Jan 2009 - Dec 2015 using the SEER-Medicare database, a nationally representative cancer registry. Patient were assumed to have progressed to a subsequent line of therapy following a gap between consecutive CT cycles ≥ 63 days. Patients were classified as GP if alive ≥4 years with no further treatment following 1L CT; PP was defined as receipt of ≥2L CT within 12 months of initial 1L CT. Demographic and prognostic characteristics were assessed during a 6-month baseline period prior to initiation of 1L CT. We assessed clinically meaningful differences in baseline characteristics with absolute standardized differences (ASD) using a threshold of 0.1 (indicating negligible difference between two cohorts). Results: There were a total of 2,262 patients (mean age: 74.6 ±6.2 years) including 251 GP (11%) and 209 PP (9%) patients (table below). PP patients were significantly more likely to be older than 70 years, and present at stage IV, liver disease and ascites, and anemia at diagnosis. PP patients were also less likely to have primary debulking surgery. Conclusions: Approximately one tenth of OC patients received no further treatment 4 years after the initial treatment with contemporary standard of care. GP may be differentiated from PP on the basis of commonly used clinical characteristics such as stage and also specific comorbidities such as liver disease and ascites. [Table: see text]