A 45-year-old man presents with symptoms of anemia, including fatigue and shortness of breath. Laboratory tests reveal a low reticulocyte count, normal serum iron levels, but significantly elevated serum ferritin levels. What is the most likely diagnosis?

Anemia of chronic disease is characterized by low serum iron levels despite adequate iron stores (as indicated by elevated ferritin levels), a hallmark of this condition. The low reticulocyte count suggests a hypoproliferative anemia, which is consistent with anemia of chronic disease. Elevated ferritin levels in this context indicate that the body has sufficient iron stores, but the iron is not being effectively utilized for erythropoiesis due to the underlying chronic disease process.