If this is pre cancerous....which I am not sure thats true, however it adds to your risk in future. Why would you need radiation Japdip?
ADH is a condition in which the cells that line the milk ducts experience abnormal growth. This is a benign condition but often referred to as Pre-cancerous since this does increase a woman's risk of developing an invasive breast cancer in the future. As a rule it is recommended that these areas be removed surgically and the area is often treated with Radiation after surgery. Bras wouldn't have any effect or cause this condition. I suspect you might be referring to a recent law suit against VS about some of their products. Regards .....
I highly doubt that wearing certain bras from vs will contribute because any brand of bra has some sort of padding, lace, underwire, strap support... etc.