Radiation Toxicity Clinical Trial
Official title:
Assessing Acute Cardiac Inflammation After Left-Sided Breast Cancer Radiotherapy With Hybrid PET/MRI
Radiation therapy (RT) of the breast is a critical component of modern breast cancer treatment. RT treatments have led to improved local control and overall survival of breast cancer patients. However, the incidence of radiation induced harmful effects is increasing in these patients. This is because in delivering RT, it is difficult to completely avoid surrounding non-cancerous normal tissue, including the heart. The main concern here is that radiation induced effects on the heart may lead to an increased risk of cardiovascular disease later in a patient's life, potentially many years after radiation. Despite methods that can detect alterations in blood flow one to two years following radiotherapy, knowledge of early radiation effects to the heart is still limited. A previous animal experiment performed by our group involved delivering a radiation dose to the heart in a manner similar to the way a heart would be exposed, during radiotherapy for a cancer involving the left breast. Taking several images over the months following radiation with a new imaging technique, hybrid PET/MRI, has suggested an increase in inflammation can be detected as early as one-week following irradiation and may be the triggering event for cardiac disease seen in women 10-15 years after radiotherapy. The investigators propose a pilot study where 15 left-sided breast cancer patients undergoing radiotherapy will be imaged before, as well as one week and one-year post radiotherapy with our hybrid PET/MRI scanner. Areas of inflammation, changes in blood flow, and scar formation within the heart, will be measured by looking at the difference between images that are taken after radiation treatment to the images taken before treatment. The expectation is that any areas of the heart that show detectable differences in the images will be directly related to how much radiation was deposited in those areas. The information gained from this pilot study which will correlate the amount of radiation administered to the degree and extent of injury will help aid in the design of new treatment strategies, that can hopefully decrease or eliminate inadvertent heart damage, thereby, improving the quality of life for breast cancer patients.
Goals: The overall goal of this study is to identify the presence of acute low-dose radiation
induced cardiac toxicity, including inflammation, in left-sided breast cancer patients
undergoing radiotherapy using hybrid positron emission tomography (PET) and magnetic
resonance imaging (MRI).
Methodology: A imaging pilot study composed of 15 left-sided breast cancer patients receiving
standard radiotherapy is proposed. Patients will be imaged at baseline, within the first
month post radiotherapy, and within the first-year post radiotherapy using a hybrid
3T-PET/MRI system (Biograph mMR, Siemens Healthcare). The PET imaging protocol is designed to
assess changes in both myocardial perfusion and inflammation. The MR imaging protocol,
acquired simultaneously, will be used to identify heart volume, wall motion, mature fibrosis
or scar.
Outcome: The findings of this studies will validate the utility of hybrid PET/MRI to detect
early inflammatory response, changes in myocardial perfusion, and heart function as a
function of radiation dose in a human breast cancer population. This will allow consideration
of new techniques to minimize or eliminate heart complications to future cancer patients and
provide a non-invasive technique to serially image patients post radiotherapy and to
investigate the effect of new interventions. Success of this study will stem from a unique
collaboration of Radiation Oncologists, Medical Physicists, Imaging Scientists, and
Cardiologists.
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