Actor Ryan O'Neal diagnosed with prostate cancer

(CNN) -- Ryan O'Neal is facing a cancer diagnosis once again, but the 70-year-old actor remains optimistic.

As he reveals in a statement, O'Neal was "recently diagnosed with stage 4 prostate cancer." While he was "shocked and stunned by the news," he says he still has a reason to feel fortunate.

"It was detected early, and according to my extraordinary team of doctors the prognosis is positive for a full recovery," he says in the statement.

He goes on to express his gratitude to friends and family for their support, and he also encourages "everyone to get regular check-ups, as early detection is the best defense against this horrible disease that has afflicted so many."

O'Neal lost his long-time partner, actress Farrah Fawcett, to anal cancer in 2009, and was previously treated for leukemia.

CNN's Jane Caffrey contributed to this report.