Final answer:
Tumors that most commonly metastasize to the liver include those from the pancreas, breast, colorectal region, lung, and ovary.
Step-by-step explanation:
The tumors that most commonly metastasize to the liver are pancreatic cancer, breast cancer, colorectal cancer, and cancers originating in the lung and ovary. Metastases occur when cancer cells spread through the bloodstream to form new cancers at distant sites. The liver, being a primary filter of blood in the body, is one of the most common organs for metastatic growth, making it a frequent site for secondary cancer developments. These metastatic cancers generally indicate a worse prognosis and are associated with most cancer deaths.