Epstein-Barr Virus Antibody and Epstein-Barr Virus DNA for Nasopharyngeal Carcinoma Screening

This study is testing whether blood tests for Epstein-Barr virus (EBV) antibodies and EBV DNA can be used to screen for nasopharyngeal carcinoma (a type of cancer at the back of the nose/throat) in high-risk men in southern China before symptoms appear. **You may be eligible if...** - You are a male between 30 and 62 years old - You live in southern China - You have at least one first-degree relative (parent, sibling, or child) who had nasopharyngeal carcinoma - You have no personal history of nasopharyngeal carcinoma - Your general health is good (ECOG score 0-2) **You may NOT be eligible if...** - You have a personal history of nasopharyngeal carcinoma - You have serious heart, liver, or kidney disease - You are currently on steroids or immunosuppressants, or have an active autoimmune condition Talk to your doctor to see if this trial is right for you.