Abstract Fibrosis with excessive amounts of type I collagen is a hallmark of many solid tumours. and fibrosis is a promising target in cancer therapy. but tools for its non-invasive quantification are missing. Here we used magnetic resonance imaging with a gadolinium-based probe targeted to type I collagen (EP-3533) to image and quantify fibrosis in pancreatic ductal adenocarcinoma. https://www.shiinatactix.com/product-category/rings/