Skip to content

    Breast Cancer Health Center

    Font Size

    HRT Raises Breast Cancer Recurrence Risk

    Major Study Halted Due to Number of Recurrences
    WebMD Health News

    Feb. 2, 2004 -- Even short-term use of hormone therapy poses an "unacceptably high" risk of breast cancer recurrence. A Swedish study has been halted because of this finding, according to a report in The Lancet.

    The study was investigating whether menopausal hormone therapy using estrogen and progestin is safe in women who are breast cancer survivors -- whether it would put these women at risk for a recurrence of breast cancer.

    After all, the number of premenopausal women who survive breast cancer is growing. And modern cancer treatments often induce early menopause.

    "There has been an increasing focus on quality of life both in cancer treatments and around the menopause in general," writes lead researcher Lars Holmberg from University Hospital Uppsala in Sweden.

    Some evidence has suggested that menopausal hormone therapy only slightly affects a woman's risk of breast cancer recurrence. However, since many breast cancers are fed by estrogen, the risks to survivors "call for caution," he writes.

    Only 345 women had been enrolled in the study when it was halted in December 2003, writes Holmberg. All were survivors of stage I or II breast cancer.

    Half of the women were getting menopausal hormone therapy and half were not.

    After just two years of follow-up, 26 women receiving hormone therapy and seven in the non-hormone therapy group had breast cancer recurrences. The risk of developing a recurrence of breast cancer in women receiving hormone therapy was three times higher than those not receiving hormone therapy.

    "We decided that these findings indicated an unacceptable risk for women exposed to [menopausal hormone therapy]," Holmberg reports.

    "The effect of menopausal hormone-replacement therapy on breast cancer risk has been controversial for decades," writes Rowan T. Chlebowski, with Harbor-UCLA Research and Education Institute in Torrance, Calif. His commentary also appears in The Lancet.

    This new evidence shows that even short-term use of hormone therapy "poses an unacceptably high risk" of breast cancer recurrence, he writes. Researchers must develop safe and effective alternatives for treating hot flashes and other difficult menopausal symptoms, he says.

    Today on WebMD

    Breast Cancer Overview
    From mammograms to living after treatment.
    Dealing with breast cancer
    Get answers to your questions.
    woman having mammogram
    The 3 latest tips to know.
    woman undergoing breast cancer test
    Most abnormalities aren’t breast cancer.
    Resolved To Quit Smoking
    Breast Cancer Treatments Improving
    Woman getting mammogram
    Screening Tests for Women
    serious woman
    Pink badge on woman chest to support breat cancer
    what is your cancer risk
    breast cancer survivors