Journal in Which the Study was Published: Oncology ReportsAuthors: Choy C, Raytis JL, Smith DD, Duenas M, Neman J, Jandial R, Lew MW.
Background: Cancer cells are under the relentless drive to spread, this metastasis is responsible for a majority of cancer-related deaths. The most ominous part of the body to which cancer can spread is the brain leading to what is called brain metastasis. Because the brain is highly unique in its anatomy and biology, breast cancer cells circulating in the blood would need to exhibit unique features to exploit the brain’s native nutrient sources – neurochemicals. Interestingly, adrenaline is a major neurochemical that is abundant during stress and also narrows blood vessels resulting in elevated blood pressure. Since many people are on regular blood pressure medicine, we investigated with bioinformatics whether patients on beta blockers (a specific blood pressure medicine that blocks the adrenaline receptor) had fewer metastases using a City of Hope patient database. In parallel, we looked at the cancer biology of triple negative breast cancers and adrenaline in the laboratory.
How the Study Was Conducted and Results: This study was initiated by a retrospective study of the metastatic breast cancer patient population at City of Hope, comparing patients who were on beta-blockers versus patients who were not taking beta-blockers. The clinical analysis suggested that there was decreased metastasis in patients taking beta-blockers.
We further investigated the effects of beta-blockers in the laboratory, and found high receptor expression in both Triple Negative (TN) breast cancer and brain metastasis tissues but not in Her2+ breast cancer and brain metastasis tissues. We then applied a variety of beta-blockers used in the clinic to the breast cancer and brain metastasis cells in the laboratory in order to observe three traits of metastasis- proliferation, migration, and invasion. We found that brain metastases cells were more sensitive than primary breast cancer cells to select beta-blocker treatments. There was a decrease in proliferation, migration, and invasion in brain metastasis cells when treated with beta-blockers. Finally, addition to using the beta-blockers alone, we added beta-blockers to cells treated with drugs that would activate the receptor. Although activating the receptor increased metastatic traits, beta-blockers decreased those effects.
Authors’ Comments: “We found that at City of Hope, breast cancer patients on beta blockers at or near the time of their surgery had decreased postoperative cancer recurrence and metastases, this intriguing findings led to a collaboration with Dr. Jandial and his laboratory to investigate the underlying cancer biology” - Michael Lew, M.D., chair and clinical professor in the department of Anesthesiology
Because biological systems, both healthy and cancerous, strive for efficiency we wondered if breast cancer cells evolved to respond to natural brain chemicals such as epinephrine” - Rahul Jandial. M.D., Ph.D., associate professor in the department of Surgery
“Both clinical and lab research showed beta-blockers may decrease metastasis, suggesting potential improvements in targeting brain metastasis from triple negative breast cancer.” – Cecilia Choy, Post-doctoral Fellow at City of Hope.Date of Publication: Published online on March 28, 2016
About City of HopeCity of Hope is an independent research and treatment center for cancer, diabetes and other life-threatening diseases. Designated as a comprehensive cancer center, the highest recognition bestowed by the National Cancer Institute, City of Hope is also a founding member of the National Comprehensive Cancer Network, with research and treatment protocols that advance care throughout the nation. City of Hope’s main hospital is located in Duarte, California, just northeast of Los Angeles, with clinics throughout Southern California. It is ranked as one of "America's Best Hospitals" in cancer by U.S. News & World Report. Founded in 1913, City of Hope is a pioneer in the fields of bone marrow transplantation and genetics. For more information, visit www.cityofhope.org or follow City of Hope on facebook, twitter, youtube or flickr.
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