Venezuelan President Hugo Chavez returned to Cuba Monday for his third cancer operation after leaving the island nation on Friday. Chavez said Saturday that “some malignant cells” had returned to an area from which tumors had been removed. After first undergoing surgery in Cuba in June 2011 for a type of pelvic cancer, Chavez will now undergo his third treatment since. Chavez lat visited Cuba on November 27 for hyperbaric oxygen treatment. Calling the relapse a “new battle,” Chavez designated Vice President Nicolas Maduro as his political successor should anything go wrong.