The outpouring of support toward Alex Trebek has not gone unnoticed by the long-time "Jeopardy!" host. On Thursday, Trebek thanked the “hundreds of thousands of people” who have wished him well following his cancer diagnosis. Earlier this month he was diagnosed with stage 4 pancreatic cancer. Trebek announced his cancer diagnosis in a video message last week. According to the American Cancer Society, the five-year relative survival rate for stage 4 pancreatic cancer is 3%.