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Commonly used drug can limit radiation damage to lungs and heart for cancer patients
Date:4/21/2013

Geneva, Switzerland: Unavoidable damage caused to the heart and lungs by radiotherapy treatment of tumours in the chest region can be limited by the administration of an ACE inhibitor, a drug commonly used in the treatment of cardiovascular disease, a group of Dutch researchers have found. [1]

Common cancers such as breast, oesophagus, lung, and Hodgkin's lymphoma are frequently treated with radiotherapy, but the radiation dose that can be given safely is limited by the sensitivity of the health lung tissue which is also irradiated.

The lung is a particularly complex and sensitive organ and strategies for protecting it from radiotherapy damage, apart from limiting the dose given and, therefore, the efficacy of the treatment, are few. Presenting the research to the 2nd Forum of the European Society for Radiotherapy and Oncology (ESTRO) today (Sunday), Dr Sonja Van der Veen, MSc, from the University Medical Centre, Groningen, The Netherlands, said that she had set out with colleagues to see whether the use of an ACE inhibitor could protect against early radiation-induced lung toxicity (RILT). Previous studies had shown that damage to blood vessels can play an important role in the development of RILT [2], so the researchers irradiated the lungs, heart, or heart and lungs of rats and administered the ACE inhibiter captopril immediately after treatment. The rats' lung functions were then measured at two-weekly intervals.

"After eight weeks, when early lung toxicity is usually at its height, we found that captopril improved the rats' heart and lung functions, but we were surprised to find that this only occurred when the heart was included in the irradiation field," said Dr Van der Veen. "This was not due to protection of the lung blood vessels, which were equally damaged with or without captopril. So we investigated further and found that the captopril treatment improved the heart's function and decreased the level of fibrosis in the he
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Contact: Mary Rice
mary.rice@riceconseil.eu
European Society for Radiotherapy and Oncology (ESTRO)
Source:Eurekalert

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