Hormone Replacement Therapy Linked to Breast Cancer Risk in Young Women

Strategic Insights -

Hormone replacement therapy (HRT) use among young women, particularly those under 55, may be associated with an increased risk of breast cancer, a new study suggests. Researchers analyzed data from over 459,476 women aged 16 to 54 years old and found that while overall HRT use was not linked to young-onset breast cancer, certain types of HRT may pose a risk. Specifically, oestrogen plus progestin therapy was found to increase the risk of breast cancer by 10%, while oestrogen hormone therapy reduced the risk by 14%.

Key Takeaways:

  • The study examined data from 459,476 women aged 16 to 54 years old and found that oestrogen plus progestin hormone therapy increased breast cancer risk by 10%.
  • Oestrogen hormone therapy was found to reduce breast cancer risk by 14% among younger women.
  • The study suggests that oestrogen-only therapy may be a safer option for women considering HRT, but more research is needed to confirm this.
  • The use of HRT in young women may influence their chances of developing breast cancer before menopause, with oestrogen-only therapy linked to a lower risk.
  • The study's findings can be used to augment clinical recommendations for hormone therapy use in young women, for whom guidance was previously scarce.
  • Dr. Kotryna Temcinaite, head of research communications at Breast Cancer Now, emphasized the importance of discussing HRT and breast cancer risk with a GP or specialist team before making a personal decision.

Statistics:

  • 8,455 women (2% of the study group) developed young-onset breast cancer, diagnosed before the age of 55.
  • 15% of women involved in the study reported using hormone therapy, with oestrogen plus progestin hormone therapy and oestrogen being the most common types.
  • 14% of HRT users were found to be at increased risk of breast cancer with oestrogen plus progestin therapy.
  • 10% of women with oestrogen hormone therapy reported a lower risk of breast cancer.

Sources:

  • "HRT and breast cancer risk in young women" (Lancet Oncology)
  • Dr. Kotryna Temcinaite, head of research communications at Breast Cancer Now
  • National Institute of Environmental Health Sciences (NIEHS)
  • Breast Cancer Now