27 juni 2012: voor het effect van toevoegen van sorafenib aan andere medicijnen bij borstkanker lees het overzichtsartikel in medscape: Clinical Overview of Sorafenib in Breast Cancer. Onderaan dit artikel hebben we een referentielijst gerelateerd aan dit odnerwerp toegevoegd.

10 september 2008: Bron: persbericht van universiteit van Georgetown.

Wanneer borstkankerpatienten naast hun hormoontherapie (o.a. Arimidex en Femara ) ook sorafenib nemen dan blijkt dat bij 26% de resistentie voor hormoontherapie wordt opgegeven en de hormoonkuur weer werkzaam wordt. Dit blijkt uit een kleinschalige studie bij 22 vrouwen met resistente borstkanker. Sorafenib heeft onder de naam Nexavar bewezen effectief te kunnen zijn bij uitgezaaide nierkanker. Ook zijn er trials bij melanomen gedaan die positieve effecten laten zien van Sorafenib.  Wel bijna altijd in combinatie met andere medicijnen.

Phase II study finds sorafenib helps reverse disease resistance to anti-hormonal therapy

FRIDAY, Sept. 5 (HealthDay News) -- The drug sorafenib may help "re-sensitize" certain breast cancer tumors to anti-hormonal drugs, Georgetown University Medical Center researchers say.

Women with estrogen-receptor or progesterone-receptor positive (ER or PR positive) metastatic breast cancers often take anti-hormonal medicines, such as aromatase inhibitors, to keep the cancer under control. Aromatase inhibitors lower the amount of estrogen in the body.

However, the tumor eventually becomes resistant to anti-hormonal drugs, and the cancer begins to grow.

"At first, the tumor's growth is halted, because the aromatase inhibitor is depriving the cancer of the estrogen it needs to grow. Eventually, though, the cancer will figure out another way to thrive in the absence of the estrogen," Dr. Claudine Isaacs, clinical director of the breast cancer program at Georgetown University Medical Center's Lombardi Comprehensive Cancer Center, said in a university news release.

Isaacs and her colleagues wanted to find out if a new approach can restore the effectiveness of anti-hormonal drugs against these tumors.

The phase II study included 27 postmenopausal women with metastatic breast cancer that had recurred or progressed while the women were taking the aromatase inhibitor anastrozole. Preliminary analysis of study data showed that 26 percent of the women showed a clinical benefit response while taking both sorafenib and anastrozole.

"Given what we know about the ineffectiveness of sorafenib alone in metastatic breast cancer, we believe the benefit that we're seeing may be attributable to the restoration of sensitivity to aromatase inhibitors," Isaacs said. "To manage breast cancer long-term, it's apparent that we may need to continually switch drugs to keep up with how a cancer evolves and evades each approach. In a sense, for each step back, we hope to take two steps forward."

 

The study was to be presented Sept. 5 at the 2008 ASCO breast Cancer Symposium in Washington, D.C. Isaacs is part of the speaker's bureau for Pfizer Inc., which makes the aromatase inhibitor Exemestane.

Clinical overview of sorafenib in breast cancer

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