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Treating cardiovascular complications of radiotherapy: a role for new pharmacotherapies.

INTRODUCTION: Available data indicate that survivors of breast cancer and Hodgkin lymphoma who received mediastinal radiotherapy are at increased risk of developing radiation-induced cardiovascular diseases (RICVD) one or two decades after treatment. Although the risk with modern radiation treatment is likely to be lower in these patient groups, cardiotoxicity is still observed in a subset of patients. In addition, radiation-associated cardiovascular complications can, in the future, extend to other groups of cancer patients who are treated for tumors that are localized near the heart.

AREAS COVERED: The authors briefly describe the most commonly observed types of RICVD. They then present an overview of preclinical animal and cellular models that have been used to investigate the mechanisms underlying RICVD pathophysiology. The beneficial effects of available drugs, and potential targets for new molecules are also reported.

EXPERT OPINION: There is a need to develop cardio-oncological programs and pharmacotherapies specifically targeting RICVD. Beyond statins, ACE inhibitors, anti-inflammatory and antioxidant agents, preclinical studies indicate that TGFβ receptor I inhibitors, Sestrin2 inducers, recombinant neuregulin-1 and miR-21 inhibitors might represent novel promising strategies. In order to properly determine the optimal therapeutic index for these molecules, in vivo models combining cancer and RICVD should be envisioned.

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