New tests done on residents of Port Hope, Ont., home to the world's oldest uranium processing facility, present a "cautionary tale" for Saskatchewan, an environmental activist says.

Frustrated by the federal government's refusal to examine the health of residents, the Port Hope Community Health Concerns Committee decided to commission its own medical study.

The results, released Tuesday, showed that four of the nine people they paid to have screened for contamination had radioactive chemicals in their bodies.

Ann Coxworth of the Saskatchewan Environmental Society said those pushing to expand the uranium industry in Saskatchewan, including a refinery, should take note.

"I think it certainly does raise concerns about the impact on communities of industries of this type," Coxworth said Tuesday.

"It's certainly something we need to be aware of in Saskatchewan before we start introducing further uranium industrial development into our own communities."

The uranium facility in Port Hope is owned by Cameco, the Saskatoon-based uranium mining giant.

The company said it wanted time to review the study before commenting on it.