LOS ANGELES, CA — Just a couple weeks after he announced the completion of his chemotherapy and began taping the latest season of “Jeopardy!,” host Alex Trebek said Tuesday he’s suffered a setback in his battle with pancreatic cancer. The longtime game-show host has had to resume chemotherapy.

Despite battling stage 4 pancreatic cancer, the 79-year-old has not missed a day on the show. Trebeck took to ABC’s “Good Morning America” to talk about his battle with cancer, candidly discussing the pain, exhaustion and frustration of the experience.

When he stopped with chemotherapy, he was optimistic. He planned a summer of recovery. But before long, his “numbers shot up,” prompting doctors to order him to resume treatment, he said.

Trebek said his goals for the summer had been to get his strength and hair back, but his progress on both fronts was “dismal.”

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Describing the toll the disease has taken, Trebek said that at times he experiences “excruciating pain” and other times “fatigue.”

The legendary host shocked fans in March when he announced his stage 4 cancer diagnosis.