Why does radiation kill cancer cells and not normal cells?
Your cells normally grow and divide to form new cells. But cancer cells grow and divide faster than most normal cells. Radiation works by making small breaks in the DNA inside cells. These breaks keep cancer cells from growing and dividing and cause them to die.
Why are tumor cells more sensitive to radiation?
Information. Cancer cells multiply faster than normal cells in the body. Because radiation is most harmful to quickly growing cells, radiation therapy damages cancer cells more than normal cells.
Are cancer cells sensitive to radiation?
Ionizing radiation has been harnessed for over a century to treat patients with cancer largely based on the rationale that the rapidly proliferating cancer cells are more sensitive than normal cells for the DNA damage response.
Why are cancer cells more sensitive to heat?
Indeed, cells at lower (acidic) pH and decreased oxygen tension, as in the center of tumors, are more sensitive to heat treatment [56,57].
What happens if I refuse radiation treatment?
Patients who refuse recommended adjuvant radiation therapy have unacceptably high rates of local recurrence. Omission of radiation for advanced age alone is associated with local recurrence rates comparable to those for younger patients.
Which organ is least sensitive to radiation?
Reproductive and gastrointestinal cells are not regenerating as quickly and are less sensitive. The nerve and muscle cells are the slowest to regenerate and are the least sensitive cells.
When do humans considered most sensitive to radiation?
Cells in late G2 and mitosis (M-phase) are the most sensitive to radiation, and cells in late synthesis (S-phase) are the most resistant (Fig. 23.10).
What types of cells are most sensitive to radiation damage?
Amongst the body cells, the most sensitive are spermatogonia and erythroblasts, epidermal stem cells, gastrointestinal stem cells. The least sensitive are nerve cells and muscle fibers.
What cancer is treated with radiation?
Radiation therapy uses high-energy radiation to shrink tumors and kill cancer cells (1). X-rays, gamma rays, and charged particles are types of radiation used for cancer treatment.
At what stage of cancer is radiotherapy used?
Radiotherapy may be used in the early stages of cancer or after it has started to spread. It can be used to: try to cure the cancer completely (curative radiotherapy) make other treatments more effective – for example, it can be combined with chemotherapy or used before surgery (neo-adjuvant radiotherapy)