BEIJING — Liu Xiaobo, the jailed Chinese dissident who received the Nobel Peace Prize for his writings promoting democracy, has been given medical parole to be treated for late-stage cancer, his lawyers and the prison authorities said on Monday.

Mr. Liu, who had been imprisoned in northeast China, was found in late May to have advanced liver cancer and was hospitalized soon after, said one of the lawyers, Shang Baojun, citing Mr. Liu’s relatives. Mr. Shang said the outlook for Mr. Liu appeared grim.

“It seems to be very serious, very serious,” he said. “If it was an early stage of cancer, then that would be easier to treat. But at this late stage, the treatment seems much more difficult.”

In a video released by Radio Free Asia, Mr. Liu’s distraught wife, Liu Xia, told a friend that his doctors “can’t do surgery, can’t do radiation therapy, can’t do chemotherapy,” apparently referring to his advanced cancer.