'Jeopardy!' host Alex Trebek undergoing chemotherapy again after setback in cancer battle

'Jeopardy!' host Alex Trebek

"Jeopardy!" host Alex Trebek revealed that he is undergoing another round of chemotherapy after a setback in his battle with pancreatic cancer. He revealed the news on an interview with ABC's "Good Morning America."

Trebek announced in March that he had been diagnosed with stage 4 pancreatic cancer. "I'm going to fight this, and I'm going to keep working," Trebek said in a video message to his fans. "Keep the faith and we'll win. We'll get it done. "

Just months later in August, Trebek announced he was "on the mend" and done with chemotherapy.

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"I've gone through a lot of chemotherapy and thankfully that is now over. I'm on the mend and that's all I can hope for right now," Trebek revealed during a video previewing season 36 of the longtime game show.

Now, his doctors have decided to have him undergo another round of chemotherapy after he lost a large amount of weight and his numbers increased dramatically.

"I was doing so well," he told "Good Morning America." "And my numbers went down to the equivalent of a normal human being who does not have pancreatic cancer. So we were all very optimistic. And they said, 'Good, we're gonna stop chemo, we'll start you on immunotherapy,'"

But, then Trebek lost 12 pounds in a week. "My numbers went sky high, much higher than they were when I was first diagnosed. So, the doctors have decided that I have to undergo chemo again and that's what I'm doing," he said.

Early on in his cancer treatment, Trebek discussed his battle with depression that started when he was first diagnosed. The host recalled how he was "writhing in pain" between tapings during the end of the last season.

Since his diagnosis, Trebek has received an outpouring of support from fans, friends and family.

"They have been an inspiration to me. That's really what it's all about," he said.

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