Safety \u00b7 Long-term
HRT and cancer risk: the honest breakdown
The WHI's cancer signals were smaller and more nuanced than headlines suggested. Modern regimens (transdermal estradiol + micronized progesterone) look cleaner than the 2002 CEE+MPA arm on nearly every cancer endpoint.
Key points
- Match regimen to individual risk
- Prefer transdermal + micronized progesterone
- Regular mammography per guidelines
Frequently asked questions
Does HRT cause breast cancer?
Depends on regimen: estrogen-only reduced incidence in WHI. Combined with synthetic MPA modestly raised it after 5 years.
What about endometrial cancer?
Adequately protected by progesterone or IUD.
Ovarian and colon cancer?
Small ovarian signal in long-duration use; reduced colorectal incidence in the combined arm.
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Written and medically reviewed by the Kindr Health Clinical Team · Published 2026-06-19 · Last reviewed 2026-07-01. Compounded medications are prepared by FDA-registered 503A pharmacies and are not FDA-approved drug products.