Toward In-Vivo Cancer Detection: X-Ray Scattering on Thick Phantom Samples

As the number of new breast cancer cases grows around the world, there is an unmet need for fast, accurate, and low-cost methods of early cancer detection. It was previously shown that X-ray diffraction on lipid molecules can provide the necessary structural biomarker. However, these measurements were performed on small ex-vivo samples, and to ensure the progress to in-vivo diagnostics, the approach should be extended to larger tissues. We use the phantom fat samples to establish such a procedure. In the obtained X-ray diffraction patterns, we observe the characteristic features for the inter-fatty-acid molecular distance. The large size of the samples led to the peak broadening, but the features remain visible up to 10 centimeters in thickness. The experimental data is in excellent agreement with the Monte-Carlo simulations based on the form factors obtained from the small samples. Our results usher the way for in-vivo monitoring of structural biomarkers of breast cancer.