The doctor treating sprint champion Lost in the Fog for cancerous tumors said Friday that the colt has "a reasonable chance" of reducing them to a size that's conducive for chemotherapy or surgery.Dr. Gary Magdesian, chief of equine medicine at University of California at Davis, said Friday that Lost in the Fog is being treated with Dexamethasone, a corticosteroid sometimes used in treating lymphoma."We want to see if (the tumors) will respond to the extent that they are reduced to a size that will make them amenable to surgery or chemotherapy," Magdesian said"There's a reasonable chance (of success)," he added. If the tumors shrink, Magdesian noted, "I would say that chemotherapy, especially, gives him the best hope (of surviving)." One of the tumors, described as the size of a football when it was discovered a week ago, is located very near the spine and was said to be inoperable. A second large tumor is located in the colt's spleen. A third mass was found in the membrane that suspends the spleen. Magdesian said an ultrasound on Lost in the Fog would be performed next week, probably Thursday, to determine whether Dexamethasone is helping to shrink the tumors.If chemotherapy is determined to be in order, Magdesian said Lost in the Fog would be treated with a combination of four other drugs.Lost in the Fog has been at the Golden Gate Fields stable of trainer Greg Gilchrist since Aug. 19 after spending a week at UCD's Large Animal Clinic, where the cancer was diagnosed.