The 78-year-old has been the host of \"Jeopardy\" since 1984 and is currently in his 35th season fronting the popular quiz show.

He took the job at \"Jeopardy\" after almost two decades hosting other game shows in his native Canada and in the U.S. with programs like \"Jackpot,\" \"High Rollers\" and \"The $128,000 Question.\"

\"PHOTO:
The Washington Post via Getty Images, FILE
PHOTO: Alex Trebek poses on the set of his game show, "Jeopardy," April 21, 2012, during a special taping in Washington, D.C.
>

Trebek took a leave of absence from the show last year after he underwent brain surgery for a subdural hematoma, which is blood clots on the brain.

Celebrities and members of the \"Jeopardy!\" community, including star Ken Jennings, posted well-wishes and messages of support on social media.

The Sajak family is deeply saddened to hear of Alex Trebek’s struggle with cancer. Our hearts go out to him and his family. But there is no one I know who is stronger and more determined, and I would never bet against him. We, and the entire country, are pulling for you, Alex.

— Pat Sajak (@patsajak) March 6, 2019

One thing I know for a fact: Alex is very aware of how much he means to millions of people, and how we will be pulling for him...I hope that’s a comfort.

— Ken Jennings (@KenJennings) March 6, 2019
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