What are masses of cells formed by cancer cells called?

• A. Tissues
• B. Organs
• C. Tumors
• D. Lesions

Answer: (C)

The masses of cells formed by cancer cells are referred to as tumors. Tumors arise when cells begin to grow and divide uncontrollably, often due to mutations in their DNA that disrupt normal regulatory mechanisms. These masses can vary in size and can be either benign (not cancerous) or malignant (cancerous), the latter being characterized by invasive growth and the ability to spread to other parts of the body.

In contrast, tissues are groups of similar cells that work together to perform a specific function, and organs are made up of different tissues that collaborate to carry out complex functions. Lesions are general terms for abnormal tissue changes, which could include tumors, but the specific term for a mass of cells resulting from cancer is distinctly referred to as a tumor.