His research interests are focused on general surgery, surgical oncology and breast cancer surgery. Professor Romanidis had a postgraduate training at the National Cancer Institute of Milan, Italy. He was also a member of the Board of Hellenic Society of Surgical Oncology. He is a member of many national and international committees and societies regarding surgical oncology. He has written over 30 peer-reviewed publications and he served as Editor and reviewer in many national and international journals.