Navigation Links
Hormone therapy increases invasive breast cancer and mortality, WHI 11-year follow up finds

BUFFALO, N.Y. -- Results of a new Women's Health Initiative (WHI) report show that hormone therapy is associated with an increased the risk of death from breast cancer, as well as an increased risk of developing invasive breast cancer in postmenopausal women.

Jean Wactawski-Wende, PhD, professor of social and preventive medicine at the University at Buffalo and one of the primary authors on the paper, published today in JAMA, says the breast cancers found in these women also tended to have more lymph node involvement, indicating a poorer prognosis.

"This report, which expands on earlier results of the WHI study, followed these women for an average of 11 years," says Wactawski-Wende. "The data show that, with further follow-up, there remains an increased incidence of breast cancer in women taking estrogen plus progestin.

"In fact, women taking estrogen plus progestin are more likely to die from breast cancer and from other causes than women who did not take these hormones."

The paper was posted online Oct. 19 at

Wactawski-Wende was co-PI at UB's WHI Vanguard Center, one of 16 that helped develop the initial protocols for the study, which began in 1993 and eventually included 40 clinical centers across the U.S. Initially planned to continue until 2005, the hormone trial was halted in 2002 because preliminary analysis of the data showed estrogen plus progestin increased the risk of heart disease, stroke and invasive breast cancer. Prior to WHI, scientists speculated that hormone therapy reduced heart disease risk.

The WHI continued to follow these women after the main trial ended. The current JAMA paper reports the results of research conducted during this WHI extension phase. Most of the earlier observational studies, which follow participants over time and collect health information at specific intervals, had suggested that breast cancers that develop in women taking hormone therapy were less advanced and had a lower risk of death.

However, the WHI researchers note in the JAMA paper that the influence of estrogen plus progestin on breast cancer mortality had not been addressed in the context of a randomized clinical trial, prior to WHI.

Their current study to answer that question was based on 12,788 surviving postmenopausal women who took part in the initial trial.

Results showed that combined hormone therapy increases the incidence of invasive breast cancer and that, more commonly, the cancers had spread to the lymph nodes. There also were more deaths attributed to breast cancer in those taking hormone therapy -- 2.6 versus 1.3 per 10,000 women. There also were more deaths from all causes in the women who had been diagnosed with breast cancer who were on hormone therapy -- 5.3 versus 3.4 per 10,000.

The trial also found that hormone therapy interfered with detection of breast cancer, leading to cancers being diagnosed at a more advanced stage.

"These findings related to increased mortality in estrogen plus progestin users were surprising," says Wactawski-Wende. "Prior studies had suggested that, although these women were diagnosed with breast cancer, their prognosis was more positive than those who were not on hormone therapy when diagnosed. This study emphasizes the importance of clinical trial data to understand the risks and benefits of taking hormone therapy."


Contact: Lois Baker
University at Buffalo

Related medicine news :

1. New findings further clarify breast cancer risk with hormone therapy
2. Breast cancer risk varies among different progestins used in hormone replacement therapy
3. Surgery better than radiation, hormone treatments for some prostate cancer, study shows
4. Oral contraceptives and hormone replacement therapy may protect women against brain aneurysms
5. Adiposity hormone, leptin, regulates food intake by influencing learning and memory
6. Study finds why some women are sub-fertile with a poor response to ovarian stimulating hormones
7. Upcoming Simulcast to Teach Women How to Lose Weight and Naturally Balance Hormones with Polycystic Ovarian Syndrome
8. Targeting flight-or-fight hormone response to combat heart failure
9. Hormone Raises Desire for Fattening Foods
10. Flame retardant linked to altered thyroid hormone levels during pregnancy
11. Women with Polycystic Ovarian Syndrome and Insulin Resistance can Lose Weight and Balance Hormones Naturally with Katie Humphrey's New E-book
Post Your Comments:
(Date:11/27/2015)... ... November 27, 2015 , ... According to an article ... of Toronto and the University of British Columbia suggested that laws requiring bicyclists to ... article explains that part of the reason for the controversial conclusion is that, while ...
(Date:11/27/2015)... ... November 27, 2015 , ... A team of Swiss doctors has ... it. Surviving Mesothelioma has just posted the findings on the website. Click here ... the cases of 136 mesothelioma patients who were treated with chemotherapy followed by EPP ...
(Date:11/27/2015)... CA (PRWEB) , ... November 27, 2015 , ... Lizzie’s ... , The company is offering customers 10% off of their purchase of lice treatment ... treatment at full price. According to a company spokesperson. “Finding lice is a sure ...
(Date:11/27/2015)... (PRWEB) , ... November 27, 2015 , ... MPWH, the No.1 Herpes-only dating community in ... (see Table 1-1 ). More than 3.7 billion people under the age of ... 1 (HSV-1), according to WHO's first global estimates of HSV-1 infection . , "The ...
(Date:11/27/2015)... (PRWEB) , ... November 27, 2015 , ... A simply ... Jones, is an interesting show that delves into an array of issues that are ... that could benefit from open dialogue, this show is changing the subjects consumers focus ...
Breaking Medicine News(10 mins):
(Date:11/26/2015)... , November 26, 2015 ... the addition of the  "2016 Future ... Global Cell Surface Testing Market: Supplier ... to their offering.  --> ... of the  "2016 Future Horizons and ...
(Date:11/26/2015)... 26, 2015 ... of the  "2016 Future Horizons and ... Drug Monitoring (TDM) Market: Supplier Shares, ... Opportunities"  report to their offering.  ... the addition of the  "2016 Future ...
(Date:11/26/2015)... , November 26, 2015 ... of the "Radioimmunoassay Market by Type ... Pharmaceutical Industry, Academics, Clinical Diagnostic Labs), Application ... Forecast to 2020" report to their ... announced the addition of the "Radioimmunoassay ...
Breaking Medicine Technology: