A 68-year-old man has had malaise for over a year. On physical examination, there are no abnormal findings. A CBC shows: Hgb 10.5 g/dL, Hct 31.5%, MCV 85 fL, platelet count 211,000/microliter, and WBC count 6980/microliter. A bone marrow biopsy is performed and microscopic examination shows that maturation is occuring in all cell lines and there are no abnormal cells seen. Stainable iron in the bone marrow is increased. He has a total serum iron of 130 microgm/dL and total iron binding capacity (TIBC) of 230 microgm/dL. Which of the following underlying diseases is he most likely to have?

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