Seventies icon Ryan O'Neal has been diagnosed with stage 4 prostate cancer, reports People. "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, wrote in a statement, despite his cancer being at the most serious stage. O'Neal has battled with cancer before, overcoming myelogenous leukemia in the late 1990s. His late partner Farrah Fawcett died of anal cancer nearly three years ago, and O'Neal's memoir of life with Fawcett is due out next month, notes Monsters & Critics. (More Ryan O'Neal stories.)