WATCH: Alex Trebek reaches one-year survival rate for Stage 4 pancreatic cancer

``Jeopardy!'' host Alex Trebek is celebrating a milestone in his battle with Stage 4 pancreatic cancer.

The Sudbury, native announced in March of last year that he'd been diagnosed with such a cancer and vowed to fight it and keep working, which he's done.   

In a new YouTube video from the ``Jeopardy!'' set, Trebek says he's ``very happy to report'' that he's just reached the one-year survival rate for his type of cancer, which is 18 per cent.

But the 79-year-old adds his treatment journey hasn't been an easy one, noting he's had ``a lot of not so good days.''

Trebek says ``there were moments of great pain, days when certain bodily functions no longer functioned, and sudden massive attacks of great depression'' that made him ``wonder if it really was worth fighting.''

But he adds he ``brushed that aside quickly, because that would have been a massive betrayal'' of his wife and ``soulmate Jean, who has given her all'' to help him survive.