Alex Trebek, the longtime "Jeopardy!" host, revealed Wednesday that he has been diagnosed with stage 4 pancreatic cancer.

Trebek, 78, said in a video posted to the Jeopardy Facebook page he will attempt to finish out this season of "Jeopardy!"

"Just like 50,000 other people in the United States each year, this week, I was diagnosed with stage 4 pancreatic cancer," he said.

"Now, normally, the prognosis for this is not very encouraging, but I’m going to fight this, and I’m going to keep working, ” he said in the video. "And with the love and support of my family and friends and with the help of your prayers also, I plan to beat the low survival rates statistics for this disease."

Using his typical quick wit, Trebek quipped that he'd have to recover in order to fulfill his hosting duties.

"Truth told, I have to! Because under the terms of my contract, I have to host 'Jeopardy!' for three more years!" he said. "So help me. Keep the faith and we’ll win. We’ll get it done. Thank you."

Watch Alex Trebek making his cancer announcement...

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