Skip to content

    Breast Cancer Health Center

    Font Size
    A
    A
    A

    Olive Oil vs. Breast Cancer

    Extra Virgin Olive Oil Compounds Fight Breast Cancer
    By
    WebMD Health News
    Reviewed by Louise Chang, MD

    Dec. 18, 2008 - Can EVOO -- extra-virgin olive oil --- cut the risk of breast cancer?

    Yes -- but only the 20% to 30% of breast cancers that express the HER2 molecules, suggest studies by Javier A. Menendez, PhD, at the Catalan Institute of Oncology in Girona, Spain, and colleagues.

    The Spanish researchers wondered why some studies show that the olive-oil-rich Mediterranean diet cuts breast cancer risk while other studies do not. They theorized that the active compounds in olive oil only affect certain cancers.

    The breast cancer drug Herceptin targets the HER2 molecule on tumor cells. Could olive oil compounds have the same target?

    Menendez's team first isolated various compounds from EVOO -- which, because it is made without heat, keeps most of the olive compounds that are lost in more processed, lower quality olive oils.

    They found that two types of these compounds, secoiridoids and lignans, killed off HER2-positive human breast cancer cells but had little effect on HER2-negative cells.

    They also found that when they fed large amounts of EVOO to rats with carcinogen-induced breast cancers, the animals' tumors became less malignant.

    But this does not mean that eating a lot of EVOO will prevent or treat breast cancer.

    "Extreme caution must be applied" in interpreting their findings, Menendez and colleagues warn.

    One class of EVOO anticancer compounds, the secoiridoids, "rapidly split into inactive compounds" when eaten. These compounds likely won't help if eaten, but could be a starting point for development of new breast cancer drugs.

    On the other hand, the lignan compounds "may represent a different molecular scenario," Menendez and colleagues suggest. In mouse-feeding studies, tumor tissues accumulate lignans, "thus suggesting that the anti-cancer activity of lignans may be due to their direct local effects on the breast cancer tissues."

    A recent study suggested that eating flaxseed is beneficial to women with newly diagnosed breast cancer. Flaxseed has high lignan concentrations.

    Even so, Menendez and colleagues note that much more study will be needed before doctors can recommend EVOO for breast cancer prevention or treatment.

    The Menendez study appears in the open-access journal BMC Cancer.

    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
    VIDEO
    Breast Cancer Treatments Improving
    Article
     
    Woman getting mammogram
    Article
    Screening Tests for Women
    Article
     
    serious woman
    Article
    Pink badge on woman chest to support breat cancer
    QUIZ
     
    what is your cancer risk
    Article
    breast cancer survivors
    Article