Discovery of Biomarkers for Intrinsic Radiation Sensitivity in Cancer Patients

This study is collecting biological samples and health information from cancer patients who had severe side effects from radiation therapy or who have a cancer type associated with increased sensitivity to radiation. Researchers hope to discover biological markers — signals in blood or tissue — that predict in advance how a person will react to radiation treatment. **You may be eligible if...** - You are between 21 and 98 years old - You are a cancer patient who experienced significant side effects from radiotherapy - OR you have a type of cancer that is known to be associated with heightened sensitivity to radiation **You may NOT be eligible if...** - You are under 21 or 99 years of age or older Talk to your doctor to see if this trial is right for you.