For a look at what life is like for Iraqis outside the capital, NPR's Melissa Block talks to Zaid Al-Ali, a former legal adviser in Iraq for the United Nations. A Look At Life In Iraq, Beyond Baghdad Listen Â· 5:29 5:29
Side effects of radiation therapy. Radiation therapy damages cancer cells. Healthy cells in the treatment area can also be damaged, even though steps are taken to protect normal tissue as much as possible. Side effects are caused by damage to healthy cells. Different cells and tissues in the body tolerate radiation differently.
Agents that may cause cancer include: Chemical carcinogens. Several chemicals and environmental toxins are responsible for changes in normal cellular DNA. Substances that cause DNA mutations are known as mutagens, and mutagens that cause cancers are known as carcinogens. Particular substances have been linked to specific types of cancer. Tobacco smoking is associated with many forms of cancer, and causes 90% of lung cancer.