How does radiation therapy primarily affect cancer cells?

How does radiation therapy primarily affect cancer cells?

• A. Causes an increase in cell growth
• B. Induces DNA damage
• C. Increases blood supply to tumors
• D. Enhances the immune response

Answer: (B)

Radiation therapy primarily affects cancer cells by inducing DNA damage. When cancer cells are exposed to radiation, the energy from the radiation disrupts the molecular structure of DNA, leading to breaks in the DNA strands. This damage can hinder the cancer cells' ability to replicate and grow. If the damage is sufficiently severe, it can trigger apoptosis, or programmed cell death, in the altered cells. Cancer cells, in particular, are often less capable of repairing this DNA damage compared to normal cells, which is why radiation therapy can be an effective treatment modality. Other options describe processes that might occur in the context of cancer treatment but are not the primary mechanism of action for radiation therapy. For instance, while some treatments do aim to enhance the immune response or improve blood supply, these are not the direct effects of radiation itself. Understanding how radiation directly impacts DNA is crucial for appreciating its role in cancer treatment and the importance of targeted therapies.

Radiation therapy primarily affects cancer cells by inducing DNA damage. When cancer cells are exposed to radiation, the energy from the radiation disrupts the molecular structure of DNA, leading to breaks in the DNA strands. This damage can hinder the cancer cells' ability to replicate and grow. If the damage is sufficiently severe, it can trigger apoptosis, or programmed cell death, in the altered cells. Cancer cells, in particular, are often less capable of repairing this DNA damage compared to normal cells, which is why radiation therapy can be an effective treatment modality.

Other options describe processes that might occur in the context of cancer treatment but are not the primary mechanism of action for radiation therapy. For instance, while some treatments do aim to enhance the immune response or improve blood supply, these are not the direct effects of radiation itself. Understanding how radiation directly impacts DNA is crucial for appreciating its role in cancer treatment and the importance of targeted therapies.