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The 73-year-old “Easy Rider” star is being treated in a “special program” at the University of Southern California, manager Sam Maydew said.
“We’re hoping for the best,” Maydew said. He did not say when Hopper was first diagnosed with cancer or otherwise elaborate on his condition.
Prostate cancer affects 1 in 6 men and has a cure rate of nearly 100 percent if caught in its early stages, according to the Prostate Cancer Foundation.
Earlier this month, Hopper was briefly hospitalized in New York for dehydration, according to the AP.
The latest diagnosis forced the actor to cancel an appearance at the Australian Centre for the Moving Image in Melbourne. The show, titled "Dennis Hopper and the New Hollywood," focuses on "the work and life of an extraordinary filmmaker, artist and key figure in the evolution of Americas cultural scene from the 1950s to today," the AP reported.
Hopper recently finished filming the second season of “Crash,” a TV adaptation of the Oscar-winning 2004 film that airs on Starz.