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Discover 19,983 clinical trials near Maryland. Find research studies in your area.
Showing 741-760 of 19,983 trials
NCT01553214
Background: \- White blood cells called granulocytes help the body fight infection. People who have had chemotherapy or bone marrow transplants may have very low numbers of these cells. Transfusions of these cells can help improve the body's ability to fight infection. However, most of the cells are located in the bone marrow or spleen, and are hard to collect from healthy donors. Two drugs, filgrastim and dexamethasone, can help move the cells to the bloodstream to be collected by apheresis. Researchers want to study the best ways to collect these white blood cells. They also want to monitor the effects of the injections and donations on the volunteer donors. Objectives: \- To improve the amount and quality of granulocytes (white blood cells) collected by apheresis for donation. Eligibility: \- Healthy volunteers between 18 and 75 years of age. Design: * Participants will be screened with a physical exam and medical history. Initial blood tests will be done to check for eligibility. * Participants will donate granulocytes by apheresis a maximum of 12 times in 1 year. Donations will not usually be requested more often than every 4 weeks. Donors will be allowed to decline participation at any time. * Participants will have one injection of filgrastim 12 to 24 hours before donation. They will also have two tablets of dexamethasone 12 hours before donation. * White blood cells will be collected through apheresis. The apheresis will last about 2 hours. * Participants will be eligible to donate until they reach their 76th birthday.
NCT02153957
Background: \- More children with cancer are surviving into adulthood. Some side effects from treatment go away quickly. But some problems may not go away or may only show up months or years later. These problems are called late effects. Late effects can cause difficulties in cognitive functions, such as attention and memory. Physical activity has been found to improve the attention and memory skills of children with Attention Deficit Hyperactivity Disorder (ADHD). Researchers want to see if physical activity can help with these cognitive problems in children with brain tumors. Objectives: \- To see if physical activity can improve cognitive functions in children who had radiation therapy for a brain tumor. Eligibility: \- Children ages 8 17 who had radiation for a brain tumor at least 2 years ago. They must have access to a computer. Design: * Participants will be screened with height, weight, and medical history. They will answer questions about daily physical activities. Their heart will be checked. * Participants will go to the clinic for 2 days. They will have a fitness exam and tests about attention, memory, and concentration. They will have blood taken and answer questions. Parents will also answer questions. * Participants will be put into 2 groups. For the first 12 weeks, the intervention group will follow a physical activity program. The control group will do their usual physical activities. * For the second 12 weeks, the control group will follow the physical activity program. The intervention group will continue the activities on their own. All groups will track their physical activity with an activity monitor and computer. * Participants will have a follow-up visit at the clinic after each session. They will repeat some of the tests listed above. * The study lasts 24 weeks plus the two follow-up visits. Participants can keep their activity monitor.