Ryan O'Neal. (Jason Merritt/Getty Images)

“Although I was shocked and stunned by the news, I feel fortunate that it was detected early and according to my extraordinary team of doctors the prognosis is positive for a full recovery,” O’Neal, 70, said in a statement.

In 2001, the “Love Story” star was diagnosed with leukemia, which is now in remission. His longtime partner Farrah Fawcett died from anal cancer in 2009.

His daughter Tatum O’Neal tweeted, “Thank you thank you everyone for the kind words about my dad. I am very happy to see the support.”

*O’Neal issued a new statement, explaining that he has stage 2, not stage 4, prostate cancer, according to People.