FCEM2-0789

FCEM2-0789

A 60-year-old man presents with fatigue, excessive sweating at night, and easy bruising. During the examination, splenomegaly is observed. The blood test results are as follows:
– Hemoglobin (Hb): 8.9 g/dl (normal range: 11.5-15.5 g/dl)
– Mean Corpuscular Volume (MCV): 87 fl (normal range: 80-100 fl)
– White Cell Count (WCC): 134.6 x 109/l (normal range: 4-11 x 109/l)
– Neutrophils: 107 x 109/l (normal range: 2-7.5 x 109/l)
– Platelets: 223 x 109/l (normal range: 150-400 x 109/l)
– Philadelphia chromosome: positive

What is the most likely diagnosis in this case?