Pediatrics General 3033b22b A family of a child just diagnosed with acute lymphoblastic leukemia asks about the child's prognosis. Which of the following is a poor prognostic indicator ? A Presence of mediastinal mass B Age between 1 and 10 years C Hyperploidy with more than 50 chromosomes D WBC count less than 50,000/mm3 at diagnosis High-Yield Explanation No explanation provided.