IUS is a breast cancer fisk factor
One in eight, or 13 %, of women get breast cancer
This is of course distressing and causes chaos in one’s life for a long time, regardless of the end result.
Breast cancer risk factors are not fully understood. If they were, there would be a lot less victims.
Messing with woman's "hormone orchestra", i.e. the extremely delicate hormonal balance of several organs by hormone supplementation is of course a health risk. This is the only logical conclusion. All sensible women do everything to avoid the dreaded breast cancer.