The term primary tumor refers to which concept?

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Multiple Choice

The term primary tumor refers to which concept?

Explanation:
The main idea is identifying the origin of cancer. The primary tumor is the original mass where malignant transformation began. From this site, cancer cells can invade surrounding tissues and spread through the body to form new tumors elsewhere, which are called metastases. So the primary tumor is the source of metastasis. In contrast, a secondary tumor at a distant site is a metastatic deposit, an in situ tumor remains localized without invasion, and a benign tumor is non-cancerous.

The main idea is identifying the origin of cancer. The primary tumor is the original mass where malignant transformation began. From this site, cancer cells can invade surrounding tissues and spread through the body to form new tumors elsewhere, which are called metastases. So the primary tumor is the source of metastasis. In contrast, a secondary tumor at a distant site is a metastatic deposit, an in situ tumor remains localized without invasion, and a benign tumor is non-cancerous.

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