Medical Genetics Chromosome and tumors Detailed studies of the philadelphia chromosome show that most of chromosome 22 has been translocated onto the long arm of chromosome 9. In addition the small distal portion of the short arm of chromosome 9 is translocated to chromosome 22. this translocation, which is found only in tumor cells indicates that a patient has chronic myelogenous leukemia(CML). In CML, the cells that produce blood cells for the body(the hematopoietic cells grow uncontrollably, leading to cancerMedical Genetics Chromosome and tumors Detailed studies of the Philadelphia chromosome show that most of chromosome 22 has been translocated onto the long arm of chromosome 9. In addition, the small distal portion of the short arm of chromosome 9 is translocated to chromosome 22. This translocation, which is found only in tumor cells, indicates that a patient has chronic myelogenous leukemia (CML). In CML, the cells that produce blood cells for the body (the hematopoietic cells) grow uncontrollably, leading to cancer