Navigation Links
Long-term tamoxifen use increases risk of an aggressive, hard to treat type of second breast cancer
Date:8/25/2009

SEATTLE While long-term tamoxifen use among breast cancer survivors decreases their risk of developing the most common, less aggressive type of second breast cancer, such use is associated with a more than four-fold increased risk of a more aggressive, difficult-to-treat type of cancer in the breast opposite, or contralateral, to the initial tumor. These findings by Christopher Li, M.D., Ph.D., and colleagues at Fred Hutchinson Cancer Research Center were published online Aug. 25 in the journal Cancer Research.

Hormonal therapy with drugs like tamoxifen is one of the most common treatments for breast cancer because it has been shown to reduce the risk of dying from the disease but, as this study suggests, it does have risks.

Comparing breast-cancer patients who received the estrogen-blocking drug tamoxifen to those who did not, the researchers found that while the drug was associated with a 60 percent reduction in estrogen receptor-positive, or ER positive, second breast cancer the more common type, which is responsive to estrogen-blocking therapy it also appeared to increase the risk of ER negative second cancer by 440 percent. "This is of concern, given the poorer prognosis of ER-negative tumors, which are also more difficult to treat," said Li, an associate member of the Hutchinson Center's Public Health Sciences Division.

These findings confirm preliminary research by Li and colleagues, published in 2001, which was the first to suggest a link between long-term tamoxifen use and an increased risk of ER-negative second cancers. "The earlier study had a number of limitations. For example, we did not have information on the duration of tamoxifen therapy the women received," Li said. "The current study is larger, is based on much more detailed data, and is the first study specifically designed to determine whether tamoxifen use among breast cancer survivors influences their risk of different types of second breast cancers," Li said.

This new study assessed history of tamoxifen use among 1,103 breast cancer survivors from the Seattle-Puget Sound region who were initially diagnosed with ER positive breast cancer between the ages of 40 and 79. Of these, 369 of the women went on to develop a second breast cancer. Nearly all of the women in the study who took adjuvant hormonal therapy used tamoxifen specifically. Detailed information about tamoxifen use was ascertained from telephone interviews and medical record reviews.

While the study confirmed a strong association between long-term tamoxifen therapy and an increased risk of ER-negative second cancer, it does not suggest that breast cancer survivors should stop taking hormone therapy to prevent a second cancer, Li said.

"It is clear that estrogen-blocking drugs like tamoxifen have important clinical benefits and have led to major improvements in breast cancer survival rates. However, these therapies have risks, and an increased risk of ER negative second cancer may be one of them. Still, the benefits of this therapy are well established and doctors should continue to recommend hormonal therapy for breast cancer patients who can benefit from it," Li said.


'/>"/>

Contact: Kristen Woodward
kwoodwar@fhcrc.org
206-667-5095
Fred Hutchinson Cancer Research Center
Source:Eurekalert

Related medicine news :

1. New research: Consumption of sugar substitutes assists in long-term weight control
2. Long-term exercise, healthy eating habits in young adults: U-M study
3. Attendance on Demand, Inc. Hosts Free Webinar Top 5 Tools to Control Labor Costs for Long-Term Healthcare Professionals 2:30pm EDT August 26, 2009
4. Long-Term Care Leader Joins 3 in 4 Need More Campaign to Promote LTC Protection for All
5. New Health Reform Campaign Will Support Long-Term Care for All, Because 3 in 4 Need More
6. MU expert offers tips for finding the best long-term care
7. LG Electronics Introduces New Flat-Panel HDTVs Designed Specifically for Long-Term Care Facilities
8. Long-term health and social outcomes for neuroblastoma survivors
9. Blood Transfusions Not Linked to Long-Term Problems
10. Actuaries: Federal Long-Term Care Legislation Falls Short on Coverage Goals
11. Energy and Commerce Committee Advances Long-Term Services and Supports in Health Care Reform
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/24/2017)... ... 24, 2017 , ... Healthcare Associates of McKinney announced today that ... at 8080 State Highway 121, Suite 210, McKinney, Texas 75070. It is in ... , As the practice has grown, the need for more space has been paramount. ...
(Date:2/24/2017)... ... 24, 2017 , ... With ProGlass Prism users now have the ability to ... control over position, rotation, distortion, edge softness, edge blur, chromatic aberration, individual glass position ... With ProGlass Prism users are given the tools and effects to generate a ...
(Date:2/24/2017)... ... ... Yisrayl Hawkins, Pastor and Overseer at The House of Yahweh, has published a ... an astounding statement when he says that the entire Bible was written for the ... times so plainly that anyone should be able to see the time period. He ...
(Date:2/24/2017)... ... ... Fiber Network (IFN) President and CEO Kelly C. Dyer recently announced that he will ... the Management Committee when IFN was originally formed in 2002 where he was ultimately ... of the business plan. He became the first paid employee of IFN in ...
(Date:2/24/2017)... Lawn, NJ (PRWEB) , ... February 24, 2017 ... ... with robust marketing services, which specializes in thought leadership , media relations, ... marketing campaigns and services that will be powered through Act-On, an intuitive marketing ...
Breaking Medicine News(10 mins):
(Date:2/24/2017)... Feb. 24, 2017  Xynomic Pharmaceuticals, Inc., an oncology ... it has acquired exclusive worldwide rights to develop, ... HDAC inhibitor targeting hematological and solid tumors. ... 1 and 2 clinical trials of Abexinostat in ... have already been completed, demonstrating that Abexinostat is ...
(Date:2/23/2017)...  Genesis Healthcare Services has merged with Hospice Cloud, ... Bill Monast , President and CEO of Hospice ... Feltman , executives with Home Health Depot, Inc., the ... This acquisition helps Hospice Cloud maintain its position ... medical equipment (DME) solutions for the hospice industry. ...
(Date:2/23/2017)... Corp. (NYSE: NVRO), a global medical device company that is ... today reported financial results for the three months and full ... & Highlights: Achieved revenue of $228.5 million ... reported, over the prior year U.S. revenue of ... prior year International revenue of $55.2 million ...
Breaking Medicine Technology: