Activity 7. KNOWING CELL DIVISION IS ESSENTIAL Directions: Analyze the situation below and answer the following questions You were an oncologist (a physician who specializes in treating cancer). You compare 2 biopsy samples by looking at the percentage of cells in mitosis. Sample #1 has 18% of cells formed in mitosis and Sample #2 has 7% of cells in mitosis. These samples are of the same tissue type Guide Questions 1. Which sample is likely to be cancerous and why? 2. What do you need to investigate in deciding if the tumor was benign or malignant?

2. Benign tumors often have a visual border of a protective sac that helps doctors diagnose them as benign. Your doctor may also order blood tests to check for the presence of cancer markers. In other cases, doctors will take a biopsy of the tumor to determine whether it's benign or malignant.2

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