Which primary cancer is the second most common source of liver metastases?

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Multiple Choice

Which primary cancer is the second most common source of liver metastases?

Liver metastases most often arise from cancers that drain into the portal circulation. Cancers of the GI tract, especially colon cancer, frequently shed tumor cells into the portal vein, delivering them directly to the liver where they can seed and grow. In many clinical contexts, breast cancer is the most common source of liver metastases, making colorectal cancer a leading but second-most frequent source. This anatomical and biological setup explains why colon cancer is the best answer for the second most common primary tumor to metastasize to the liver.

Liver metastases most often arise from cancers that drain into the portal circulation. Cancers of the GI tract, especially colon cancer, frequently shed tumor cells into the portal vein, delivering them directly to the liver where they can seed and grow. In many clinical contexts, breast cancer is the most common source of liver metastases, making colorectal cancer a leading but second-most frequent source. This anatomical and biological setup explains why colon cancer is the best answer for the second most common primary tumor to metastasize to the liver.

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