Venezuelan President Hugo Chavez flew back to Cuba late Saturday for another round of radiation therapy, telling his countrymen that he has faith a "miracle" will help him survive cancer.

Venezuelan president Hugo Chávez said on Sunday that his cancer has returned, adding that he will undergo radiation therapy in the coming weeks.

The health condition of Venezuelan President Hugo Chavez could be worse than what has been published so far, with possible carcinogenic tumors in both prostate and colon.

The cancer threat is expected to increase with the aging populations of Latin America and the Caribbean, according to the Pan American Health Organization.

Venezuelan President Hugo Chavez said he is being treated for cancer in Cuba after doctors on the communist island detected a tumor during an emergency operation this month that had been shrouded in mystery.

Venezuelan priests went against Pope John Paul II's order nearly 10 years ago to avoid efforts to topple President Hugo Chavez, leaked U.S. documents indicated.