Triple-Negative Breast Cancer

Triple-negative breast cancer, a subtype of breast cancer, takes its name from the fact that it doesn’t have the three proteins (estrogen receptors, progesterone receptors, and HER2 receptors) known to fuel the growth of breast cancer. While this type of cancer does not respond to standard hormone-lowering medications, triple-negative tumors are much less likely to recur than estrogen-positive tumors after five years.

Estimates place the number of breast cancers that are triple-negative at between 15% and 20% of all breast cancers. Triple-negative breast cancer tends to be a more aggressive form and is more frequently diagnosed in younger women and African-American and Hispanic women. It is also more likely to occur in women who carry a BRCA mutation.

Frequently Asked Questions

  • Can you be cured of triple-negative breast cancer?

    In the first years following a diagnosis, survival rates are lower, compared to hormone receptor-positive cancers, but, unlike hormonal receptor-positive tumors—which are notorious for having late recurrences—triple-negative tumors are much less likely to recur after five years. While triple-negative breast cancer may be more aggressive than hormone receptor-positive breast cancer, it may also be more curable.

  • What causes triple-negative breast cancer?

    A number of risk factors are associated with triple-negative breast cancer, including age, family history, genetic mutations, and ethnicity. It’s more likely to occur in younger people, African Americans or Hispanics, and those with a BRCA1 gene mutation.

  • Is triple-negative breast cancer hereditary?

    Family history is a risk factor for breast cancer. A number of genes have recently been discovered that can, if defective, increase the risk of getting any type of breast cancer by 20% as well as elevate the chance that a breast cancer diagnosis will be triple-negative breast cancer.  The most well-studied are the BRCA genes.

  • Does triple-negative breast cancer respond to chemotherapy?

    Hormonal therapies (such as tamoxifen or aromatase inhibitors) and HER2-targeted therapies (such as Herceptin) are not effective for treating triple-negative breast cancer. Triple-negative tumors tend to respond better to chemotherapy than hormone receptor-positive breast cancer. For metastatic triple-negative breast cancers, an immunotherapy drug was approved in 2018 only for triple-negative breast cancer.

  • How fast can triple-negative breast cancer spread?

    Breast cancers are often present in the body for several years before they are detected. Rates of growth, once they are found, varies. In a 2016 study that looked at tumor growth between diagnosis and surgery over a month-long period, triple-negative tumors grew at a rate of about 1% a day, while hormone receptor-positive tumors grew at a slower rate.

  • What are the chances of triple-negative breast cancer returning?

    Most women successfully treated for triple-negative breast cancer will not experience breast cancer recurrence. The risk tends to be highest during the first five years following the completion of therapy and decreases steadily thereafter.

Key Terms

Page Sources
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