"I feel the need to clarify my quote that, if my course of cancer treatment does not continue to work, I would consider stopping treatment," the Jeopardy! host said in a statement issued today, his 80th birthday. "That quote from the book was written BEFORE my current regimen, and I was going through some bad times. My current numbers are very good, but we will have to be patient with this new immunotherapy program that I am on. But, if it were to stop being successful, I would return to my previous chemo treatment -- NOT stop all treatment. I apologize for any confusion, and want everyone to know that I am optimistic about my current plan, and thank them for their concerns." ALSO: Trebek is overwhelmed by messages of support on his 80th birthday.