If you are found to have hepatitis B, C, or HIV infection, the study staff will contact you and your cancer doctor. You will receive further evaluation by medical staff in the Departments of General Internal Medicine, Infectious Diseases, or Gastroenterology, Hepatology and Nutrition, to determine whether you need antiviral medication and further medical care during chemotherapy treatments. The study staff will inform your cancer doctor if you need antiviral medication. The study staff will work closely with your cancer doctor(s) to avoid any delays in treatment.