I asked a similar question a few months ago, and the consensus was it
was valid.  Check the archives, as I can't recall specifics.

(Mum I asked about did wean for her treatment, although she managed to
get to 9 months before it was all sorted through.)

Morgan Gallagher

Lyla Wolfenstein wrote:
> greetings,
>
> mother pregnant, having thyroid ablation for thyroid cancer. doctors
> originally wanted to do radiation treatment immediately post-delivery
> and separate mom and baby for a week, with total weaning. 
>
> now, because cancer does not appear to have spread, docs willing to
> wait 6 months, but are suggesting total weaning, to achieve empty
> breasts before radiation treatment. they say the reasons are that not
> enough is known about the effect of radiation on breast tissue, and
> that it might travel through the milk (if pumping and dumping) and
> cause breast cancer later. 
>
>   

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