Final answer:
Cancer cells can spread from the primary tumor to other tissues through a process called metastasis. The three main ways in which cancer spreads are local spread, lymphatic spread, and through the bloodstream. Cancer cells invade nearby tissues, spread to lymph nodes, and can form new tumors in different locations in the body.
Step-by-step explanation:
Cancer cells can spread from the original site (primary tumor) to other tissues through a process called metastasis. There are three main ways in which cancer spreads. First, cancer cells can directly invade nearby tissues through local spread. Second, cancer cells can spread to regional lymph nodes through the lymphatic system. Lastly, cancer cells can enter the bloodstream and travel to distant sites, forming new tumors in different locations in the body.