EPID-17. REAL-WORLD OUTCOMES OF BRAIN METASTASES FROM PANCREATIC CANCER: AN ANALYSIS OF 1266 PATIENTS

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Abstract BACKGROUND Brain metastases (BMs) from pancreatic cancer (PC) are uncommon. This study examined patterns of care and clinical outcomes for PC BMs. METHODS A retrospective analysis was conducted on PC BMs patients in the US National Cancer Database between 2010-2020, following STROBE guidelines. Treatments were categorized into systemic therapy (Sys) alone, stereotactic radiosurgery (SRS)±Sys, whole brain radiation (WBRT)±Sys, and no brain-specific treatment (NoTx). Primary outcome was median overall survival (mOS), with corresponding hazard ratio for death (HR) and 95% confidence intervals. Prognostic factors were determined using multivariable Cox proportional-hazards analysis including age, sex, race/ethnicity, insurance, Charlson-Deyo score (CDS), concurrent metastases (CMs), and treatment type. RESULTS Of 170,071 metastatic PC patients, 1,266 (0.7%) PC BM patients were included. 45.7% were female and 81.3% were White. Median age was 66.0 years (IQR:58.0-74.0). 34.4% had bone CMs, 45.4% had lung CMs, 60.2% had liver CMs. 48.1% of patients received NoTx, 22.6% Sys, 12.4% WBRT+Sys, 9.8% WBRT, 4.6% SRS+Sys, and 2.5% SRS. mOS (95% CI) was 2.4 months (2.2-2.5) in patients with BMs and 3.9 months (3.8-3.9) in those without BMs (P<0.001). Amongst BM patients, SRS+Sys had a significantly higher mOS of 7.8 months (6.1-14.3) followed by WBRT+Sys: 5.2 months (4.2-6.8), Sys: 4.8 months (4.2-5.8), WBRT: 2.0 months (1.6-2.2), SRS: 1.8 months (1.4-3.7), and NoTx: 1.2 months (1.0-1.3) (P<0.001). Patients treated with SRS alone (HR:2.9, 1.8-4.7, P<0.001), WBRT alone (HR:2.9, 2.0-4.0, P<0.001), and Sys alone (HR:1.5, 1.1-2.1, P=0.009) had significantly lower survival than with SRS+Sys. Patients treated in nonacademic facilities (HR:1.3, 1.1-1.4, P<0.001) and those with CMs (HR:1.4, 1.2-1.6, P<0.001) had poorer survival. CONCLUSIONS BMs in PC are rare and associated with lower survival. SRS+Sys was associated with the best prognosis, but <5% received it. 48% of patients receiving NoTx had mOS of 1.2 months. Future studies exploring care variations are warranted.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.