A 62-year-old man complains of weakness, fever in the tongue, numbness of the lower extremities. Objectively established: pale skin with a subicteric tinge, bright red tongue, taste buds smoothed. Liver - +3 cm. Gastroscopy revealed mucosal atrophy shell. In the blood found: erythrocytes -1,2 × 1012/ l, Hb - 56 g/l, KP - 1,4, macrocytosis, leukocytes - 2,8 × 10 ^ g/l, eosinophils - 2%, rod - 4%, segmental - 50%, lymphocytes - 42%, monocytes -2%, reticulocytes - 0.1%, platelets - 120 × 10 ^ g/l, ESR - 36 mm/h, bilirubin - 29 mmol/l, indirect - 26 mmol/l. What is the most likely diagnosis?