The present registry aims at a) large-scale data accumulation and comprehensive evaluation of the incidence, causality and current treatment strategies of SAPF, b) comparative assessment of treatment strategies including or not including protein C supplementation c) identification of patient subgroups of particular eligibility for Protein C treatment, as judged by established criteria of disease severity assessment, d) feedback of aggregated data to registry contributors, thus permitting quality management and standard updates, e) dissemination of data evaluation summaries and recommendations for the use of Protein C formulations in clinical routine, f) elaboration of a framework for SAPF treatment recommendations and guidelines.