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Discover 19,983 clinical trials near Maryland. Find research studies in your area.
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NCT04569591
This study is designed as a single institution trial. The study utilizes safe and clinically-validated tools for preoperative workup of patients with small pituitary tumors. DDAVP stimulation and 18F-labeled fluoro-deoxyglucose (FDG) uptake for PET-imaging will be used to detect MRI-negative pituitary adenomas in patients with Cushing s disease. Patients who have MRI-negative pituitary microadenomas will undergo FDG PET-imaging with DDAVP stimulation. Intravenous FDG will be given approximately four hours following DDAVP administration. Within 12 weeks after completion of the FDG high-resolution PET scan, patients will undergo surgical resection of the pituitary adenoma. Surgical and histological confirmation of adenoma location will be noted. All images will be read independently by neuroradiologists blinded to clinical and histopathological outcomes. The diagnostic and localization accuracy of PET-imaging will be assessed by comparing the PET findings with histopathology.
NCT05419024
Background: Human immunodeficiency virus (HIV) infects CD4 T cells. There is no cure for HIV. People with HIV need to take daily medications called antiretroviral therapy (ART) to control their infection. ART stops HIV from infecting cells, but HIV does not go away. Some infected cells remain. If ART is stopped, then HIV levels will rise and infect more cells. Objective: To compare changes in the amount of virus in blood and lymph nodes after a short treatment interruption. Eligibility: Adults aged 18 years or older who are undergoing ART for HIV infection. Design: Participants will be screened with a physical exam, including blood tests. They will be assigned to 1 of 2 groups: One group will stay on ART. They will have 2 study visits: the first 45 days after screening, and the second 12 to 16 weeks later. They will have a PET/CT scan at each visit. A substance called a tracer will be injected into their arm. They will lie still on a table that moves through a doughnut-shaped machine. This process takes up to 2 hours. The other group will stop ART for no more than 90 days. This group will have 3 PET/CT scans over 8 months. Once they stop ART, they will visit the clinic weekly for blood tests. After restarting ART, they will continue to visit the clinic weekly until their HIV level is safe. All participants will have small samples of tissue taken from lymph nodes. They may also opt to provide semen samples or vaginal fluid. They may have samples taken of bone marrow or the fluid inside their spinal column.