Last updated on August 2018

Breast Cancer Lung Late Effects

Brief description of study

Through improved early detection and treatment, the number of long term breast cancer survivors continues to increase. There are now 2.8 million breast cancer survivors in the U.S. Florida alone adds over 9,000 women to the survivorship pool each year. Most receive radiation treatment (RT) of the affected breast and chest wall to reduce risk of recurrence. Even with advanced radiation techniques for dose conformality to minimize exposure of the highly sensitive lung, 14% of breast cancer patients treated with radiation develop clinical pulmonary toxicity, with 4% overall experiencing high grade clinical toxicity. Early diagnosis and intervention to mitigate lung radiation toxicity is increasingly important for the long term care of these survivors.

The investigators' goal is to better identify breast cancer patients at high risk for experiencing severe pulmonary toxicity requiring medical intervention, provide a means to identify toxicity early on, and tailor treatment and/or early intervention on a per-patient basis.

Detailed Study Description

This project involves repeat chest computed tomography (CT) imaging and blood draws in subjects with breast cancer with radiation treatment to the affected breast and chest wall. The investigators are studying women receiving one of 2 types of radiation, either conventional X-rays (IMRT) or protons at the University of Florida Health Proton Therapy Institute (UFHPTI). These subjects typically would not receive follow-up chest CTs as per standard of care. All subjects will have received a pre-treatment chest CT scan as part of the treatment planning process. The investigators will enroll 30 subjects in the X-ray treatment group and 25 subjects in the proton group.

The investigative team has recently solved the technical challenges of extracting and characterizing lung vascular anatomy from clinical CT images of the chest and used these tools to characterize acute and chronic changes to pulmonary vascular structure in breast cancer patients receiving radiation to the chest wall for treatment of their cancer.

In Aim 1 of this study the investigators will compare lung vascular damage in women treated with conventional radiation with those treated at the UFHPTI. In Aim 2 they will use blood samples of the subjects of Aim 1 to investigate the differential role of inflammatory cytokines in the initiation and progression of pulmonary vascular radiation response in conventional versus proton radiation exposures. Aim 3 compares vascular damage with clinical pulmonary function assessment using spirometry and diffusion capacity of carbon monoxide (DLCO). Aim 4 ties together Aims 1-3 by employing and extending existing mathematical models of radiobiological response to improve and solidify the scientific understanding of the biological mechanisms of radiation response.

Clinical Study Identifier: NCT02725840

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Walter O'Dell, PhD

Department of Radiation Oncology Davis Cancer Pavilion
Gainesville, FL United States
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Julie Bradley

University of Florida Health Proton Therapy Institute
Jacksonville, FL United States
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Recruitment Status: Open

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