Minor regression and long-time survival (56 months) in a patient with malignant pleural mesothelioma under Viscum album and Helleborus niger extracts-a case report J Thoracic DiseaseWerthmann, Paul G.; Saltzwedel, Gerhard; Kienle, Gunver S.March 14, 2021Malignant pleural mesothelioma, Helleborus niger extract, GM-CSF, dendritic cells, Viscum album extract