What role, if any, is there for Y90 in metastatic gallbladder cancer to the liver?  

Radioembolization has been best studied in liver dominant metastatic colorectal cancer (mCRC) and BCLC Stage B hepatocellular carcinoma (HCC) as these are the two scenarios where there have been large randomized controlled trials of Y90 vs standard of care systemic therapy (SARAH and SIRveNIB trials...