Do most cancers metastasize?

Characteristic of : Some (lung cancer n general, specifically show with small cell), others, highly unusual (primary brain tumors). More fascinating is organotropism - prostate commonly goes to bones, with the exception of rhabdoid kidney tumors, almost no pediatric tumors go to the brain.

Yes: Ability to metastasize is a key feature of malignancy. Basal cells carcinomas of skin rarely, if ever, metastasize, brain cancer do not metastasize outside the brain.