Arthur Porter has been replaced as the man in charge of a long-delayed, multimillion-dollar Caribbean cancer centre over concerns about his health and the allegations of fraud he faces in Canada.

The controversial former head of Canada's spy watchdog is caught up in a number of allegations swirling around a billion-dollar Montreal mega-hospital development.

The Canadian government is now trying to extradite Porter — a medical doctor who has been self-diagnosed with cancer — from the Bahamas.

Those troubles precipitated Porter's departure this week from the $5-million Cancer Centre Eastern Caribbean project being built in the Antigua and Barbuda capital of St. John's.

One of Porter's associates will take over the project.

Porter is among the five people named in arrest warrants issued by Quebec's anti-corruption squad in the McGill hospital case.