MS-1701

A 70-year-old male is referred to a haematologist for an elevated white blood cell count and an increased quantity of mature myeloid cells on his blood film. The diagnosis of chronic myeloid leukaemia is confirmed with the presence of an oncogene. He is promptly treated with chemotherapy and a tyrosine kinase inhibitor. What is the oncogene associated with chronic myeloid leukaemia?