A 32-year-old welder complains of weakness and fever. His illness initially presented as tonsillitis one month earlier. On examination: temperature – 38.9°C, respirations – 24/min., pulse – 100/min., blood pressure – 100/70 mm Hg, hemorrhages on the legs, enlargement of the lymph nodes. Complete blood count shows Hb- 70 g/L, RBC- 2.2 × 1012/L, WBC- 3.0 × 109/L, with 32% of blasts, 1% of eosinophils, 3% of bands, 36% of segments, 20% of lymphocytes, and 8% of monocytes, ESR - 47 mm/hour. What is the cause of anemia in this case?