Acute Leukemia

My 85 year old pappy fell and was taken to the hospital because his arm swelled and they found a clot in it. After being hospitalized for 3 days they told us he has acute leukemia. They gave him a month to a year to live. I've been reading on this and mostly what I see is they make it a month or two. Has anyones family or close persons been through this and can tell me anything. Plz anything would help.