6825 liver cancer cases in elderly aged >=65 years reported to SEER in 2007-2009 4155 primary hepatocellular carcinoma with known diagnosis month/year 2015 with AJCC stage I/II hepatocellular carcinoma 1768 cases with continual enrollment in Medicare Parts A and B 2670 non primary cases, non carcinoma, diagnosed at autopsy, or missing diagnosis date 2140 with stage III/IV hepatocellular carcinoma or unknown stage 247 not continually enrolled in Medicare Parts A, B 1036 cases with continual enrollment in Medicare Part D 732 not continually enrolled in Medicare Part D Supplementary Figure S1. Selection of Medicare patients diagnosed with hepatocellular carcinoma for investigation of the association of statin use and survival