Honorary Member of the Hellenic Society of Mastology, Athens, Greece (1987)
Corresponding Member of the Academia National de Medicina de Buenos Aires, Buenos Aires, Argentina (1989)
Honorary Member of the Hellenic Society for Lung Cancer, Pireas, Greece (1990)
Doctor Honoris Causa of “Carol Davila” University of Medicine and Pharmacy, Bucharest, Romania (2002)
Honorary Member of the Hellenic Society for Toxicology, Greece (2002)
Doctor Honoris Causa of “Iuliu Hatieganu” University of Medicine and Pharmacy, Cluj-Napoca, Romania (2004)
Visiting Professor, University of Catania, Italy (2005)
Honorary Member of the Balkan Union of Oncology (2007)
Honorary Member of the Hellenic Society of Surgical Oncology (2011)
Honorary Professor, Fujian University, P.R. China (2013)
Visiting Professor, Kyoto University, Japan (2014)