Metastasis involves the spread of tumor cells from a primary site to distant sites with continued relentless growth. Metastasis is responsible for about 90 percent of cancer deaths and is the most fearsome aspect of cancer. The epithelial mesenchymal transition is currently the dominant explanation for the origin of cancer metastasis and is based on the somatic mutation theory of cancer. However, emerging evidence indicates that metastatic cancer cells arise following the fusion of cancer stem cells with macrophages.
Read MoreIs Cancer a Genetic or Metabolic Disease? Part 43 rounds for time of:
7 strict muscle-ups
50 squats
1,000-meter row
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