Why do FELV kittens die

[Gloria B. Lane]

Hey everyone - I was just wondering if anyone has any insight as to 
why FELV+ kittens die?  With adult cats, I know that they get 
Lymphoma, or Leukemia, in generall, and can die from that process.

With kittens are the symptoms just more subtle, or is it something 
else? I just heard of a kitten that tested light positive for FELV, 
was seeming fine, and then unexpectedly and suddenly died.

Anybody have any clues about this?  Thanks!
Gloria