https://www.cnet.com/news/jeopardy-alex-trebek-reveals-his-cancer-battle-on-twitter/

"Normally, the prognosis for this is not very encouraging, but I'm going to fight this, and I'm going to keep working," Trebek said. 

"Truth told, I have to because under the terms of my contract, I have to host Jeopardy for three more years," Trebek joked.