Acute Myelogenous Leukemia (AML) Support Group
Acute myelogenous leukemia (AML), also known as acute myeloid leukemia, is a cancer of the myeloid line of blood cells. Patients with AML usually present with symptoms such as fatigue, bleeding, infection, prompting medical attention. An abnormal blood test reading will then result in further testing in a hospital with a hematologist to determine AML.
So sorry to hear of your dad's dx. This support group is not very active these days so you may want to visit the lymphoma leukemia society group at the link below.
Relative to your question about m5. The m categorization of AML ,FAB, has been replaced when the WHO designation. Link provide below. Within a couple of weeks, the cytogenetics testing should be back on your dad's pre treatment bmb. This will place him in a favorable, intermediate or unfavourable category. This will determine treatment path. Chemo only or Stem cell transplant.
http://community.lls.org/forum/25-acute-myeloid-leukemia/
https://www.lls.org/leukemia/acute-myeloid-leukemia/diagnosis/aml-subtypes
:) julie