Phase i study evaluating the treatment of patients with hepatocellular carcinoma (HCC) with carbon ion radiotherapy: The PROMETHEUS-01 trial. - Combs, Stephanie E.; Habermehl, Daniel; Ganten, Tom; Schmidt, Jan; Edler, Lutz; Burkholder, Iris; Jäkel, Oliver; Haberer, Thomas; Debus, Jürgen (BMC Cancer, 2011)