Non Small Cell Lung Cancer Clinical Trial
Official title:
Cardiopulmonary Toxicity of Thoracic Radiotherapy
Radiotherapy improves locoregional control and survival of thoracic tumour patients. However, the associated exposure of normal tissues, often leads to side effects and possibly even reduces survival. Indeed, there is growing evidence that overall survival after radiotherapy for lung and oesophageal cancer is related to the radiation dose to heart and lungs. This suggests that thoracic radiotherapy causes mortality, which is currently not recognized as radiation-induced toxicity. So the question arises how to explain this treatment-related mortality. Interestingly, Ghobadi et al demonstrated in rats that thoracic irradiation can lead to pulmonary hypertension (PH). Histopathological analysis showed that radiation-induced PH closely resembles the pulmonary arterial hypertension (PAH) subtype. Moreover, in a clinical pilot study we confirmed early signs of PH including dose-dependent reductions in blood flow towards the lungs in radiotherapy patients. In general PH significantly affects survival. Moreover, the PAH subtype is the most-rapidly progressive and lethal subtype. However, medical treatment can significantly slow down PAH progression, providing opportunities for secondary prevention. Yet, hard evidence that radiation-induced PH is a clinically relevant phenomenon in patients treated for thoracic tumours, is lacking.
In the present study, the incidence and time course of treatment-related changes in cardio-pulmonary physiology will be assessed using standard diagnostic tools such as echocardiography, cardiac MRI (CMR) and serum biomarkers and relate them to the radiation dose distribution. Such insight in the characteristics of this possible radiation-induced PH and contributing risk factors is essential to develop primary (radiation dose optimization) prevention strategies. The general objective of this study is to test the hypothesis that pulmonary hypertension (PH) is a clinically relevant radiation-induced side effect of thoracic irradiation. If confirmed this allows us to take appropriate measures in patient care to improve quality of life in thoracic cancer patients. To investigate this hypothesis, the following specific aims have been defined: - To assess the incidence and time course of PH in a prospective cohort study in patients treated with radiotherapy for lung or oesophageal cancer. - To characterize other changes in myocardial function and pulmonary arteries, and their function using cardiac MR. - To determine treatment-related risk factors, in particular radiation dose factors to the lungs and heart that could be used for future optimization strategies to minimize the risk of inducing PH in these patients. - To determine the clinical impact by correlating PH to patient-rated outcome measure (PROMs) and survival. Taken together this study will determine if radiation-induced pulmonary hypertension is a clinically relevant toxicity and will provide information required for future studies on its prevention and treatment. In addition, more insight will be obtained on other forms of cardiovascular damage and complications that may occur in these patients. ;
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