Clinical Research Directory

Study of Factors Regulating Mast Cell Proliferation

This study will examine growth factors that promote and inhibit mast cell proliferation resulting in mastocytosis, a disease of excessive mast cells in the body. These cells can release chemicals that cause itching, blisters, flushing, bone pain and abdominal pain. Patients up to 80 years of age with mastocytosis may be eligible for this 1-day study. Participants will have one visit at NIH lasting up to 8 hours, during which they will undergo the following tests and procedures: * Medical history and physical examination. * Laboratory studies, if medically indicated. * Blood tests to identify genetic changes important in the growth, development, and functioning of mast cells. * Bone marrow aspiration and biopsy. For the bone marrow procedure, the skin over the hipbone and the outer surface of the bone itself are numbed with local anesthesia. Then, a special needle is inserted into the hipbone and about 1 tablespoon of bone marrow is drawn into a syringe. Another needle is inserted into the same area to collect a small piece of the bone marrow. Additional procedures may include allergen testing, urinalysis, and 24-hour urine collection. Participants will receive an evaluation of their mastocytosis.

Bone Marrow Imaging and Clinical Outcomes Across Hematologic, Oncologic, and Other Relevant Conditions

An observational study of patients with hematologic, oncologic, and other relevant conditions undergoing bone marrow imaging, with longitudinal collection of imaging, treatment, and clinical outcome data to characterize bone marrow features and changes over time

Bone Marrow Injection in Fracture of Femoral Neck

Objectives: * Primary objective : * To investigate the predisposing factors for femoral neck fractures, including age, sex, and associated comorbidities. * To investigate the complications associated with intracapsular femoral neck fractures, particularly in young patients. * To evaluate the effectiveness of autologous bone marrow injection at the femoral neck fracture site and its effect on: * Achieving complete fracture union. * Reducing the time required for fracture healing. * Reducing the incidence of avascular necrosis of the femoral head. * Secondary objective: The study addresses the challenge of performing total hip arthroplasty in young patients. Complications following intracapsular femoral neck fractures, particularly avascular necrosis and nonunion, may ultimately necessitate this treatment option. However, total hip arthroplasty is generally less desirable in young patients because of: * Early prosthetic loosening. * The potential need for revision arthroplasty later in life due to wear and deterioration of prosthetic components over time. * Higher complication rates and lower long-term success rates. In this study, we will focus on the use of fully threaded cannulated screws combined with bone marrow injection into the fracture site, and evaluate their effect on the healing and union of intracapsular femoral neck fractures.