Aids simple cure?

I have a theory I think is no longer a conspiracy. My uncle got aids in like 96 when I was 10 and has had it until last year December. He got cancer and had to have some lymph nodes removed. During treatment they had to filter his blood and put it back in because it was leukemia. Low and behold after the filtering they rechecked his blood and he no longer has aids. His oncologist and primary we're both in doubt. So they tested him again and once again negative for aids. I wasn't sure where to post this but it's been just gnawing at the back of my mind and now here I am. So is blood filtration the cure for aids or is leukemia the cure ? I'm leaning towards the blood filtering.