LAS VEGAS, NV - APRIL 09:  "Jeopardy!" host Alex Trebek speaks as he is inducted into the National Association of Broadcasters Broadcasting Hall of Fame during the NAB Achievement in Broadcasting Dinner at the Encore Las Vegas on April 9, 2018 in Las Vegas, Nevada. NAB Show, the trade show of the National Association of Broadcasters and the world
LAS VEGAS, NV - APRIL 09: "Jeopardy!" host Alex Trebek speaks as he is inducted into the National Association of Broadcasters Broadcasting Hall of Fame during the NAB Achievement in Broadcasting Dinner at the Encore Las Vegas on April 9, 2018 in Las Vegas, Nevada. NAB Show, the trade show of the National Association of Broadcasters and the world's largest electronic media show, runs through April 12 and features more than 1,700 exhibitors and 102,000 attendees. (Photo by Ethan Miller/Getty Images)
PHOTO: Ethan Miller/Getty Images
Now playing
01:34
Alex Trebek tears up at contestant's kind message
First dogs Champ and Major Biden moved into the White House on Sunday, January 24.
https://twitter.com/firstdogsusa/status/1353684536375324672
First dogs Champ and Major Biden moved into the White House on Sunday, January 24. https://twitter.com/firstdogsusa/status/1353684536375324672
PHOTO: Adam Schultz/White House
Now playing
02:17
Internet rejoices as dogs return to the White House
PHOTO: Jeopardy Productions, Inc./Sony Pictures Entertainment Inc.
Now playing
01:16
See what happens when 'Jeopardy!' ends in a tie
PHOTO: Sunday TODAY / NBC
Now playing
01:41
Kate Hudson opens up about her unique family
Max Titkemeier
Max Titkemeier
PHOTO: WNWO
Now playing
01:01
Ohio boy raises $13,000 for fallen police officer
PHOTO: JoJo Siwa / TikTok
Now playing
01:31
See JoJo Siwa's unique coming out announcement
PHOTO: CNN
Now playing
00:48
Larry King signs off CNN: Instead of goodbye, so long
Now playing
01:16
Sen. Patrick Leahy doubles as a Batman actor
bernie mittens senator sanders inauguration viral fashion moos pkg ebof vpx_00002005.png
bernie mittens senator sanders inauguration viral fashion moos pkg ebof vpx_00002005.png
PHOTO: Twitter/@MinnesotaMemes
Now playing
02:18
Bernie Sanders' 'grumpy chic' style steals show at inauguration
PHOTO: Medical Park Hospital
Now playing
01:02
Loyal dog waits outside a hospital for her owner
PHOTO: NFL/Twitter
Now playing
01:16
NFL surprises health care workers with Super Bowl tickets
Serena Williams w/ daughter Olympia
Serena Williams w/ daughter Olympia
PHOTO: @SerenaWilliams
Now playing
00:43
Tennis legend's daughter joins her on the court
Now playing
01:38
Dakota Johnson discusses what playing a dying woman taught her
PHOTO: TheImageDirect.com
Now playing
02:10
Life-size cutout of Ben Affleck's ex trashed after their breakup
PHOTO: Maurice Kervin
Now playing
01:45
Watch this snowboarder survive an avalanche in Colorado
PHOTO: ABC / "Good Morning America"
Now playing
01:52
Jacob Blake tells GMA 'I didn't want to be the next George Floyd'
(CNN) —  

Alex Trebek is opening up about his pancreatic cancer battle.

Trebek has gone through chemotherapy and has to undergo it again, so he knows that he might not have a lot of time left to live, the “Jeopardy” host told ABC News.

But, he added, prayer and supporters have helped him feel a lot better since his diagnosis.

“I have learned something in the past year and it’s this: We don’t know when we’re going to die,” Trebek said. “Because of the cancer diagnosis, it’s no longer an open-ended life, it’s a closed-ended life because of the terrible survival rates of pancreatic cancer. Because of that, and something else that is operating here, people all over America and abroad have decided they want to let me know now, while I’m alive, about the impact that I’ve been having on their existence.”

He added: “They have come out and they have told me, and my gosh, it makes me feel so good.”

Although at one point Trebek was in “near remission,” he told ABC News in October he’d have to undergo chemotherapy again, since the cancer had returned.

“We may try a new protocol, a different chemo or something in the trial stage that is not chemotherapy,” he said, adding, “I don’t mind experimenting. I’ve got nothing to lose, so let’s go for it.”

In March, he revealed in a YouTube video he had been suffering from stomach pains before being diagnosed with stage 4 pancreatic cancer, which he vowed to fight.

He told his wife of 29 years, Jean Trebek, first, but not right away, because “it was not devastating news to me.”

“Throughout my life, I’ve always wondered about how courageous a human being I was,” Trebek said. “I just look at it as it’s a part of life. Does that mean I’m courageous because I’m dealing with it? No. I could be scared to death and I’d still have to deal with it.”