Philadelphia - Former heavyweight champion Joe Frazier - who was diagnosed with liver cancer - sleeps for most the day but is coherent when awake, his personal and business manager said.
Leslie Wolff, who has been the 67-year-old Frazier's manager for seven years, said Frazier has been flooded with get-well messages from former boxers and fans.
"There is evidence that there are certain people that fight much harder than other people, and in doing so, they last longer," Wolff said Monday. "They have the heart of a champion. Joe ain't no quitter. Even in this struggle, he's showing people you don't give up."
Frazier was diagnosed last month with the disease. His manager says the boxer had been in out and out of the hospital since early October and has been receiving hospice treatment the last week.
The documentary "Joe Frazier: When the Smoke Clears" will be screened on Tuesday night at the DocNYC festival in New York.
"No matter what happens, we must make sure his legacy stays alive," Wolff said.
Wolff said doctors have not yet told Frazier how long he has to live. Wolff, who dismissed false reports all weekend that Frazier had died, denied a story he wanted to send Frazier to Russia for treatment. Wolff said he contacted doctors there only for ideas for other potential treatments to fight the disease.
"We just want to see what's out there to see what can be done here," he said.
Frazier was the first man to beat Muhammad Ali, knocking him down and taking a decision in the so-called Fight of the Century in 1971. He would go on to lose two more fights to Ali, including the epic "Thrilla in Manila" bout.
Frazier won the heavyweight title in 1970 by stopping Jimmy Ellis in the fifth round of their fight at Madison Square Garden. He defended it successfully four times before George Foreman knocked him down six times in the first two rounds to take the title from him in 1973. Frazier would never be heavyweight champion again.
Frazier has not allowed anyone to see him except his immediate family and associates.
"He's in no shape to have any visitors, nor does he want any," Wolff said.