Which tumor is highly radiosensitive?
Among these tumors, undifferen- tiated carcinoma and small cell carcinoma have relatively high radiosensitivity, followed by squa- mous cell carcinoma.
Which malignant tumors are very radiosensitive?
Two examples of highly radiosensitive cancers are leukemia (cancer of the blood cells) and lymphoma (cancer of the lymphatic system). Radiation therapy is most effective when a tumor is contained, easily accessible, and located away from major organs of the body.
What cancers are most sensitive to radiation?
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.
Which type of tumors are more sensitive to radiation therapy?
Embryonal tumors, as well as tumors composed of rapidly growing cells, are sensitive to radiotherapy. Lymphoid cells are particularly susceptible to radiation. On the contrary, neurosarcoma, glioma and melanoma are radioresistant.
What is the most common ovarian tumor?
The mature teratoma is by far the most common ovarian germ cell tumor. It is a benign tumor that usually affects women of reproductive age (teens through forties). It is often called a dermoid cyst because its lining is made up of tissue similar to skin (dermis).
How do benign and malignant tumor differ?
What is the difference between benign and malignant cancer? Tumors can be benign (noncancerous) or malignant (cancerous). Benign tumors tend to grow slowly and do not spread. Malignant tumors can grow rapidly, invade and destroy nearby normal tissues, and spread throughout the body.
What makes a tumor radiosensitive?
Radiosensitivity depends on several factors. These factors include the ability to repair damage, hypoxia, cell cycle position, and growth fraction. In addition, the volume of the initial tumor has been demonstrated to influence the ability to eradicate tumors.
When are cells 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 organ is sensitive to radiation?
Radiation in high doses can be dangerous no matter what, but some parts of the body are more sensitive than others. The most sensitive parts of the human body are the lymphoid organs, bone marrow, blood, testes, ovaries and intestines, according to the Collaboration for Nondestructive Testing.
What organs are affected by radiation?
Let’s do a head-to-toe walk-through to investigate how high doses of radiation can damage the human body.
- Brain. Nerve cells (neurons) and brain blood vessels can die, leading to seizures.
- Eyes. Radiation exposure increases the risk of cataracts.
- Thyroid. …
- Lungs. …
- Heart. …
- GI tract. …
- Reproductive organs. …
Why are rapidly dividing cells more sensitive to radiation?
The reason that rapidly growing cells are sensitive (in the sense that they are easily damaged or killed), is that during cell division, one double-stranded DNA becomes two single-stranded DNA chains.