Investigator initiated multi-institutional retrospective review of clinical and radiographic outcomes after 90Y resin microsphere radioembolization for metastatic colorectal liver metastases in the USA. The target is for at least 1,000 evaluable patients with 12+ weeks follow up.

Investigator initiated multi-institutional retrospective review of clinical and radiographic outcomes after 90Y resin microsphere radioembolization for metastatic colorectal liver metastases in the USA. The target is for at least 1,000 evaluable patients with 12+ weeks follow up. Objectives:

Independent data collection and reporting of pre treatment and 12 week post treatment clinical, radiographic and radiation parameters and outcomes in patients treated in the USA from 2002-2010. Data beyond 12 weeks will be collected and highly desirable, however as a minimum all patients will have 12 week follow up.

Inclusion Criteria:

• Patients who received 90Y resin microsphere radioembolization for metastatic colorectal cancer with liver metastases between November 2010 and March 2011 in the USA. Patients must have at least 12 weeks of follow up.

Exclusion Criteria:

• Patients who received glass 90Y microsphere radioembolization for metastatic colorectal liver metastases.

Patients with colorectal liver metastases in the USA treated with 90Y resin microsphere radioembolization