Don't cancer metastases have more to do with cancer mutations allowing the cancer cells to form new tumors? Some cancer types tend do not develop the ability to colonize new tumors while others do regularly.
"The risk of tumor seeding after liver biopsy is 2.7%"
https://easl.eu/wp-content/uploads/2018/10/Hepatocellular-Ca...
Tissue containment systems for uterine morcellation
https://www.fda.gov/medical-devices/safety-communications/up...