WASHINGTON -- Republican presidential candidate Fred Thompson has a rare type of cancer that specialists say is incurable but not life-threatening over the short term. Although the 65-year-old former senator and actor says his disease is in remission, studies of other cases indicate that it's likely to return within the next two to five years. But cancer experts say his malignancy -- a slow-growing disruption of the immune system known as non-Hodgkin's lymphoma -- can be well managed with drugs and needn't interfere with normal activities. They say Thompson has an excellent chance of survival for at least five to...