Department of Pharmacology Chulalongkorn University Bangkok 10330 Thailand;
Department of Radiology Phramongkutklao College of Medicine Bangkok 10400 Thailand;
Division of Medical Oncology Department of Medicine Phramongkutklao College of Medicine Bangkok 10400 Thailand;
Division of Gastroenterology and Hepatology Department of Medicine Phramongkutklao College of Medicine Jatujak 10900 Thailand;
Hepatocellular carcinoma; Chemoembolization; Dexamethasone; Double blind method; Prevention; Postembolization syndrome;