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A tumor that is shedding free cancerous cells into the bloodstream that can start new tumors in other locations throughout the body is more commonly referred to as a _______________ tumor.
Metastatic benign malignant invasiveFree cancer cells can travel throughout the human body through the circulatory system and the ______________ system.
1. Lymphatic
2. Digestive
3. Nervous
4. Muscular.