Spanish tenor Jose Carreras, resuming his career full-time after overcoming leukemia, said he will sing an entire opera this summer and begin filming a movie about Enrico Caruso in the fall. "I am ready to face this challenge as a real professional, not as a miraculously healed person," the singer told a news conference in Milan, Italy, Tuesday. Carreras, who has performed a number of concerts since he began a comeback last year, said he will sing in Luigi Cherubini's "Medea" in Merida, Spain, in July. He said it would be a good test for tougher engagements later, including a world premiere of "Cristobal Colon," by Catalonian author Lleonard Balada, in September.