Since there is no published information on this issue, I will share two 
anecdotal experiences.

One of my clients developed leukemia (ALL) at about 18 months old. She 
continued to bf through her treatment, with a brief nursing strike 
during chemo which resolved when she was given anti-nausea drugs (laying 
down to bf made this little girl sick). She recovered and was well last 
I spoke to her mother.

A good friend's first child developed non-Hodgkins lymphoma at age 6. 
She was bf his younger sibling, so fed him expressed milk on his cereal 
once a day during his chemo and radiation. He's a grown man and is still 
completely healthy.

Catherine Watson Genna, IBCLC  NYC

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