Washington: Contrary to current thinking, researchers of new study have found that taking beta blockers that treat high blood pressure does not decrease a person`s risk of developing colorectal cancer.The study also revealed that even long-term use or subtypes of beta blockers showed no reduction of colorectal cancer risk.In recent years, researchers have thought that beta blockers, which are prescribed to many older adults for high blood pressure and heart conditions, might be linked with a decreased risk of cancer.This theory stems from animal and laboratory studies that found that the stress hormone norepinephrine could promote the growth and spread of cancer cells. Beta blockers inhibit norepinephrine`s action, so it stands to reason that the medications could have anticancer properties.Previous studies on beta blockers` effects on colorectal cancer risk have yielded inconsistent results.To provide more thorough information, Michael Hoffmeister, PhD, of the German Cancer Research Center, in Heidelberg, Germany, and his colleagues conducted personal interviews from 2003 to 2007 with 1,762 patients with colorectal cancer and 1,708 cancer-free individuals.
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