First off what is the type? the ones most commonly found in adults are: Chronic Lymphocytic Leukaemia (CLL) and Acute Myelogenous Leukaemia (AML).
second: what, if any, are the other health issues eg. Cardiac, arthritis, respiratory, endocrine etc
third: have options been discussed with said patient with an oncologist? such options are chemo, and depending on the health of said patient possible stem cell transplant
you have to remember that the physical and mental health of said patient plays an overall part in both treatment and survival. probably best to wait and ask said patient's oncologist after all routine tests have been done and the results are back. He/She will be able to give you a better idea than any of us unless someone on here is a medically trained oncologist and we don't know it.
i've grown up around hospitals my whole life as both parents are medical professionals (mum is an RN and dad is a senior radiographer that runs a medical imaging department in a hospital) i've grown up around doctors and Emergency departments coz i use to go do portable xrays with dad when mum was working and he got called in so....