Dennis Hopper (73) has been diagnosed with prostate cancer and is canceling all travel plans to focus on treatment, his manager said Thursday.

The 73-year-old actor and artist is being treated through a "special program" at the University of Southern California, said Sam Maydew.

Asked about Hopper’s prognosis, Maydew said, "We’re hoping for the best." He would not elaborate on the actor’s condition.

Hopper was hospitalized in New York earlier this month for dehydration. Hopper also cancelled his appearance at an exhibition of his artwork and photography at the Australian Centre for the Moving Image in Melbourne, Australia.

Hopper is currently cast in the TV show Crash, and has several film projects lined up, but those projects may all be put on hold as Hopper receives treatment.