Causal Modeling of Cancer-Stromal Communication Identifies PAPPA as a Novel Stroma-Secreted Factor Activating NFκB Signaling in Hepatocellular Carcinoma. oleh Julia C Engelmann, Thomas Amann, Birgitta Ott-Rötzer, Margit Nützel, Yvonne Reinders, Jörg Reinders, Wolfgang E Thasler, Theresa Kristl, Andreas Teufel, Christian G Huber, Peter J Oefner, Rainer Spang, Claus Hellerbrand