A 63-year-old man presents to his primary care physician complaining of weakness

A 63-year-old man presents to his primary care physician complaining of weakness, weight loss, and left upper quadrant pain. Physical examination demonstrates diffuse lymphadenopathy and splenomegaly. Peripheral blood analysis demonstrates a WBC count of 40,000/mm³, with increased neutrophils, eosinophils, and basophils on peripheral smear. Polymerase chain reaction analysis of his blood demonstrates a t(9;22) chromosomal translocation. Which of the following would most likely be used to treat his condition?

(A) Imatinib mesylate
(B) Infl iximab
© Paclitaxel
(D) Propylthiouracil
(E) Tamoxifen