Sharon I'm not sure what IBC is called here, I did not learn to call it that in uni, but I did only study it as part of a wider module about Breast cancer.
Only 1-2% of breast cancers are IBC though, indeed you have more chance of getting another type of tamoxifen insensitive tumour and a FAR greater liklyhood of developing a tumour which CAN be treated using tamoxifen (and Herceptin). However in post menopausal women regular mammograms are ESSENTIAL and all women should check their breasts at least once a month!
1 in 9 women will develop some form of breast tumour in their lifetimes so get your 5 pieces of fruit and veg a day and eat oily fish twice a week! It may not totally protect you but it has been seen to help produce a positive outcome!