[2000]-[XR9576]-[P-Glycoprotein Inhibitor][Protocol Number: 01-C-0091]
Protocol Number: 01-C-0091
Title: Phase I Trial and Pharmacokinetic Study of Tariquidar (XR9576) a P-Glycoprotein Inhibitor, in Combination with Doxorubicin, Vinorelbine or Docetaxel in Pediatric Patients with Refractory Solid Tumors including Brain Tumors
Number: 01-C-0091
Summary: This study will examine the safety and side effects of tariquidar in children and adolescents with cancer and test whether it can improve current anticancer drug treatments. Tumor resistance to chemotherapy is a major problem in cancer treatment. Studies have found that a protein (P-glycoprotein) on some cancer cells pumps anticancer drugs out of the cells, reducing treatment effectiveness. In laboratory tests, an experimental drug called tariquidar has blocked pumping by this protein. It is being used in this study to try to increase amounts of the anticancer drugs vinorelbine (Navelbinea), doxorubicin (Adriamycin) or docetaxel (Taxotere) in cancer cells.
Patients between 2 and 18 years of age with solid tumors-including rhabdomyosarcoma and other soft tissue sarcomas, Ewing's sarcoma family of tumors, osteosarcoma, neuroblastoma, Wilms' tumor, liver tumors, germ cell tumors, and primary brain tumors-who have relapsed or who do not respond to frontline therapy and have no other treatment options may be eligible for this study. Candidates will be screened with a medical history, physical and neurological examinations, blood and urine tests, electrocardiogram, MUGA (nuclear medicine scan of the heart) and radiologic studies to evaluate the extent of disease.
Participants will receive tariquidar plus either doxorubicin, vinorelbine or docetaxel, depending on the type of cancer, previous treatments, and side effects of prior treatment. Patients taking doxorubicin will also receive GCSF, a drug that helps boost the immune system, and dexrazoxane, a medicine to lessen the harmful effects of doxorubicin on the heart. Patients taking docetaxel will also receive GCSF, plus medicines to prevent an allergic reaction to the docetaxel. Treatment will be given in 21-day cycles for no more than eight cycles.
The first treatment cycle for each regimen begins with a baseline Sestamibi scan-an imaging procedure that uses the radioactive drug Tc-99m Sestamibi. This drug accumulates in tumor cells and is eliminated from them in much the same way that some cancer drugs are eliminated from cells. The drug is injected into a vein and a series of pictures taken with a camera that detects radioactivity shows where the radioactive Sestamibi distributes in the body, including in the cancer, liver and heart. This procedure can monitor for effects of tariquidar on resistance to therapy. The day after the Sestamibi scan, tariquidar is given intravenously (through a vein), followed by another Sestamibi scan. On the third day, tariquidar is given, followed by the treatment drug (doxorubicin, vinorelbine or docetaxel). Patients taking vinorelbine will repeat the tariquidar and vinorelbine doses 1 week after the first. Sestamibi scans are done during the first treatment cycle only for each drug regimen. In addition, for the first treatment cycle only, 17 blood samples of less than one-half teaspoon each are drawn to study the pharmacology of tariquidar (i.e., how the drug works in the body), and another 17 samples are taken to study the pharmacology of the chemotherapy drug. A device, such as a heparin lock, is put in place to avoid having multiple needlesticks for these blood draws.
Routine blood tests are done twice a week and various tests, such as X-rays, CT and MRI scans are done periodically to follow the progress of the cancer throughout the treatment period. Patients taking doxorubicin will also have an echocardiogram or MUGA to evaluate heart function. Patients are examined by a doctor at least once a week.
Sponsoring Institute:
National Cancer Institute (NCI)
Recruitment Detail
Type: Active Accrual Of New Subjects
Gender: Male & Female
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