Alex Trebek is facing another round of chemotherapy

Alex Trebek has some disappointing news on his cancer fight.

Less than a month ago, the Jeopardy! host revealed he'd made remarkable progress fighting stage 4 pancreatic cancer, saying he'd finished his chemotherapy treatments and was back at work. But after replacing chemo with immunotherapy treatments, Trebek's "numbers went sky high" and doctors opted to put him back on chemotherapy, he told Good Morning America in an interview aired Tuesday.

Trebek announced his stage 4 pancreatic cancer diagnosis in March, pledging that he was "going to fight this" and "beat the low survival rate statistics for this disease. As of late May, that seemed to be happening, as Trebek revealed his cancer was in "near remission." "Some of the tumors have already shrunk by more than 50 percent," Trebek said at the time.

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Those positive results led doctors to stop chemotherapy and begin immunotherapy with Trebek. But when his "numbers" went "much higher than they were when I was first diagnosed," Trebek says doctors told him he had to resume chemo. As he has all along, Trebek tried to stay positive, telling Good Morning America that he's had "one hell of a good life" and isn't afraid to acknowledge that "there is an end in sight for me, just as there is for everyone else." Watch all of Trebek's interview below. Kathryn Krawczyk