Cancer cells can spread (metastasize) from their original location to other parts of the body. This happens when the cancer cells gain the ability to move and invade other tissues. Here's a step-by-step explanation of why lung and breast cancer often spread to the liver:

1. Invasion: Cancer cells invade nearby healthy cells. In this case, the lung or breast cancer cells invade the healthy cells around them.

2. Intravasation: After invading the nearby cells, the cancer cells then move through the walls of nearby lymph vessels or blood vessels.

3. Circulation: Cancer cells travel through the lymphatic system and the bloodstream to other parts of the body.

4. Arrest and Extravasation: The cancer cells stop moving as they are lodged in capillaries at a distant location. They then invade the walls of the capillaries and migrate into the surrounding tissue (extravasation).

5. Proliferation: Once the cancer cells have invaded new tissue, they begin to grow and form new tumors. This is known as proliferation.

6. Angiogenesis: The new tumors then grow their own blood vessels, a process called angiogenesis, "feeding" themselves to continue growing.

The liver is a common site for metastasis because it has a rich blood supply and it is linked to other parts of the body by the bloodstream and the lymphatic system. The liver's function of filtering the blood also allows it to catch and trap circulating cancer cells.

Question

Cancer cells can spread (metastasize) from their original location to other parts of the body. This happens when the cancer cells gain the ability to move and invade other tissues. Here's a step-by-step explanation of why lung and breast cancer often spread to the liver:

1. Invasion: Cancer cells invade nearby healthy cells. In this case, the lung or breast cancer cells invade the healthy cells around them.

2. Intravasation: After invading the nearby cells, the cancer cells then move through the walls of nearby lymph vessels or blood vessels.

3. Circulation: Cancer cells travel through the lymphatic system and the bloodstream to other parts of the body.

4. Arrest and Extravasation: The cancer cells stop moving as they are lodged in capillaries at a distant location. They then invade the walls of the capillaries and migrate into the surrounding tissue (extravasation).

5. Proliferation: Once the cancer cells have invaded new tissue, they begin to grow and form new tumors. This is known as proliferation.

6. Angiogenesis: The new tumors then grow their own blood vessels, a process called angiogenesis, "feeding" themselves to continue growing.

The liver is a common site for metastasis because it has a rich blood supply and it is linked to other parts of the body by the bloodstream and the lymphatic system. The liver's function of filtering the blood also allows it to catch and trap circulating cancer cells.

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