This is from one document I stored that mentions a recently discussed subject:
TETRA: A Critical Overview into the death of Officer Neil Dring 

I have been around the world talking to scientists and we agree, although it 
cannot be proved, that the recent incidents in breast cancers in ladies could 
be due to the metal underwiring in bras absorbing microwave radiation and 
re-emitting it at a different wavelength into the mammary glands of the breast. 
The mammary glands are known to be particularly sensitive to radiation and they 
are known to be easily changed into cancer cells. Confidential Report on TETRA 
for the Police of England and Wales by B Trower



I can't really comment on how correct it might or might not be.



another link:

http://www.stenulson.net/althealth/es-disc.htm



  I understood the problem of underwires being a different one again, namely 
providing metal to receive any stray radio or microwave (or whatever) signals.