Patients with cancer often complain that their "mind does not seem to be clear." This can be due to stress, depression, anxiety, or physical problems caused by cancer or the treatments used to control symptoms. There are many purposes for this study; one of them is to learn about the effects of cancer treatments on the brain, and another is to identify useful tools to detect these effects. The results of this study may stimulate new research comparing different treatments to the current treatment so the researchers may learn how to treat symptoms more effectively and improve patient quality of life. We would also like to learn more about the effects chemotherapy may have on DNA.