Who do I contact when I have a question? If you have any questions at any time, please call. A nurse or a physician is available 24 hours a day by telephone. To speak with your main doctor or with a clinic nurse, call the Hematology/Oncology Clinic between 8 AM and 4:30 PM Monday to Friday. To speak with the research nurses, call the research nurse office during the day; during nights, weekends, and 85 Short Title: Enzalutamide Vaccine in mCRPC Version Date: 03/29/2022 sometimes during the day, when the research office is empty, you may leave a message for the research nurse on the answering machine. You can call Dr.