When does metastasis occur?

Question

Quizplus · Accepted Answer

Metastasis occurs when cancer cells break away from the primary tumor and invade other parts of the body, usually through the bloodstream or lymphatic system. This is a characteristic of malignant tumors, whereas nonmalignant cells grow slowly and do not typically invade other tissues. Tumor growth and interference with body functions (A) and rapid cell division within an organ (B) are also characteristics of cancer, but they do not necessarily indicate metastasis.

When Does Metastasis Occur