Linked from
The 24 pages that link to Metastasis, each with the reason it gives.
ChemotaxisRelated: Chemical cues can influence cancer-cell migration and organ-specific spread.
Clonal evolutionRelated: Disseminated lineages face new environments and undergo further selection.
ChondrosarcomaRelated: High-grade chondrosarcoma can spread, most often to the lungs.
SarcomaRelated: Sarcomas commonly spread through the bloodstream, often to the lungs.