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Cancer vaccine combination therapy shows survival benefit in breast cancer
Date:5/15/2012

tients."

The article, available online, is titled "L-BLP25 vaccine plus letrozole induces a TH1 immune response and has additive antitumor activity in MUC-1 expressing mammary tumors in mice."

Breast cancer is the second-leading cause of cancer death in women in the United States, following lung cancer. Most cases of breast cancer are "estrogen-dependent" and respond to hormonal therapy. For tumors that are independent of hormonal influence, treatment options are limited and would especially benefit from a new treatment strategy such as a vaccine.

The vaccine was found to work best when the tumor burden -- the amount of cancer present -- was low, indicating that the vaccine may one day be best used as a preventative measure for women at high risk of developing breast cancer or for treatment of early disease.

Vaccine therapy is a promising new cancer-fighting strategy; the first therapeutic vaccine for prostate cancer was approved by the U.S. Food and Drug Administration in 2010. Trials with L-BLP25 vaccine are currently under way for lung and pancreatic cancers, whose cells also express altered MUC1, the same tumor-associated antigen found on breast cancer cells. The current study is the first known to the authors to demonstrate that a hormonal therapy combined with a vaccine provides additive antitumor activity and survival benefit.

"This was a true alliance between academics and industry," added DeGregorio, who noted that trials such as this one are especially expensive because of the number of mice needed and the length of time -- about three and a half years -- required to establish their findings. The study had support from the pharmaceutical company, Merck KGaA Darmstadt Germany.

DeGregorio's group will further test the vaccine with other conventional therapies and determine optimal dosing. Clinical trials in patients with breast cancer are in the planning stages.


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Contact: Dorsey Griffith
dorsey.griffith@ucdmc.ucdavis.edu
916-734-9118
University of California - Davis Health System
Source:Eurekalert

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