Radiation therapy is used to reduce the chance of breast cancer recurrence after surgical removal of the primary cancer in approximately 2,000 British Columbian patients and approximately 2 million women around the world annually. Because the breast is a mobile organ sitting over the lungs and heart, these organs and other normal tissues may receive unwanted radiotherapy dose leading to serious side effects. Our group has designed a carbon-fibre device suitable for breast positioning in radiotherapy to optimize the position of the breast during treatment to reduce these side effects. Initial tests in our clinic are very promising. To bring this device into widespread use for patients, further work is required to improve the quality of the device to meet the highest standards for patient care and those set by Health Canada. Carbon fibre devices are very challenging to make when complex shapes are required, as is the case for this breast support. We will work with a research group specializing in carbon fibre to find the best materials and manufacturing process for the device, and then get the improved device into the hands of leading experts in breast cancer treatment for further evaluation in the clinic.