358 Background: Transarterial chemoembolization (TACE) has demonstrated survival advantage over best supportive care in patients with unresectable hepatocellular carcinoma (HCC), and non-randomized data suggests that survival in HCC treated with yttrium-90 radioembolization (90Y) is similar to that achieved with TACE. Eighty to 90% of patients with HCC have underlying cirrhosis, so survival analyses of liver-directed treatments (LDT) should take into account both tumor extent and liver function. Methods: We conducted a retrospective study to evaluate the effect of tumor extent and liver function on the survival of patients treated with TACE and/or 90Y for HCC. Patients with unresectable HCC treated at Rush University Medical Center between 2002 and 2014 were analyzed. Liver function parameters prior to first treatment were recorded for each patient, and survival measured from time of first treatment to death or last follow up was calculated. Statistical inference for overall survival was performed using Kaplan-Meier method, log-rank test, and Cox proportional hazards regression model. Results: The difference in overall survival between patients with unilobar disease and with bilobar disease (n=35 and 23, median survival of 19.4 and 12.8 months, respectively) was not found to be significant (p=0.838). However, the difference in overall survival among patients with Child Pugh A (n=22, median not reached), B (n=30, median= 11.4 months) and C (n=6, median=3.8 months) cirrhosis was strongly significant (p < 0.001). In a multivariate Cox proportional hazards analysis, the association of Child class (coded on an integer scale) with overall survival, adjusted by the extent of the disease, continued to be strongly significant (HR=1.93, p < 0.001). Conclusions: Liver function may be just as important a determinant of survival in patients undergoing liver directed treatments for HCC as is extent of disease. Larger, prospective studies are needed to confirm this hypothesis.