HGS-ETR2 to Treat Children With Solid Tumors

Background * HGS-ETR2 is a monoclonal antibody, produced in the laboratory from human genes. * HGS-ETR2 targets a protein called the TRAIL receptor that is located on the surface of some tumor cells. When the TRAIL receptor is activated, it can cause the tumor cell to self-destruct. Objectives: * To determine the highest dose of HGS-ETR2 that can be given safely in children and young adults with cancer. * To study the pharmacology (how the body handles the drug) of HGS-ETR2 by measuring the amount of drug in the bloodstream over time before and after a dose is given to the patient. * To determine if HGS-ETR2 can stop or slow tumor growth. * To determine whether proteins in tumor tissue before treatment can predict whether the tumor will respond to HGS-ETR2 therapy. Eligibility: -Patients 1 to 21 years of age with solid cancers that do not respond to standard therapy. Design: * HGS-ETR2 is given through a vein (intravenously, IV) once every 14 days. Each treatment cycle is 28 days long and consists of two doses of HGS-ETR2. * The dose of HGS-ETR2 is increased in successive small groups of patients until the maximum tolerated dose (highest dose with acceptable side effects) is determined. * During the treatment period, patients have a physical examination at least once a week, and routine blood tests at least twice a week. These tests are done less frequently in later treatment cycles. * Additional blood samples are drawn for immunology and pharmacology studies. * Tests to monitor the size of the tumor (X-rays, CT scans, MRI, PET scans) are done periodically throughout the treatment period. * Patients may continue to receive HGS-ETR2 until unacceptable side effects develop or the tumor grows.