Question below based on the following passage. What is cancer? It is a group of more than one hundred separate diseases. Most of usfear of cancer. It is reasonable because next to heart disease, cancer is the second leading cause of death. Cancer cells come from healthy cells because of mutations of DNA. Those mutations can occur spontaneously. The mutations may also be induced by other factors such as nuclear and electromagnetic radiation, viruses, bacteria and fungi, parasites, heat, chemicals in the air, water and food, mechanical cell-level injury, free radicals, evolution and ageing of DNA, etc. All such factors can produce mutations that may start cancer. Cancer cells are formed continuously in the organism. It is estimated that there are about 10,000 cancer cells at any given time in a healthy person. Why do some result in macroscopic-level cancers and some do not? First, not all damaged cells can multiply, and many of them die quickly. Second, those who potentially divide and form cancer are effectively destroyed by the mechanisms available to the immune system. Therefore, cancer develops if the immune system is not working correctly or the amount of cells produced is too high for the immune system to eliminate. What topic does the paragraph preceding the passage most likely discuss?

Question

Question below based on the following passage.

What is cancer? It is a group of more than one hundred separate diseases. Most of us fear of cancer. It is reasonable because next to heart disease, cancer is the second leading cause of death.

Cancer cells come from healthy cells because of mutations of DNA. Those mutations can occur spontaneously. The mutations may also be induced by other factors such as nuclear and electromagnetic radiation, viruses, bacteria and fungi, parasites, heat, chemicals in the air, water and food, mechanical cell-level injury, free radicals, evolution and ageing of DNA, etc. All such factors can produce mutations that may start cancer.

Cancer cells are formed continuously in the organism. It is estimated that there are about 10,000 cancer cells at any given time in a healthy person. Why do some result in macroscopic-level cancers and some do not? First, not all damaged cells can multiply, and many of them die quickly. Second, those who potentially divide and form cancer are effectively destroyed by the mechanisms available to the immune system.

Therefore, cancer develops if the immune system is not working correctly or the amount of cells produced is too high for the immune system to eliminate.

What topic does the paragraph preceding the passage most likely discuss? $\;\;\;\;$

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