Dataset Information

Genotype-Directed Study Of Irinotecan Dosing In FOLFIRI + BevacizumabTreated Metastatic Colorectal Cancer

ABSTRACT: This study involves standard combination chemotherapy treatment for colon cancer, 5-Fluorouracil (5FU), leucovorin and irinotecan (known as FOLFIRI), plus bevacizumab (Avastin). The study is designed to test the FOLFIRI regimen based on certain characteristics of a person’s genetic makeup or "genes". Genes are made of DNA and determine not only inherited traits or appearance (hair and eye color, height, body type, etc.) but also play an important role in health and how the body responds to illness and treatments for those illnesses. In this study, the investigators will examine the relationship between a patient’s genes (DNA), or "genotype", and how the patient’s body breaks down and removes or "metabolizes" the anti-cancer drug irinotecan. Circulating blood level of irinotecan plays an important role in how well this drug works against a patient’s cancer as well as the adverse side effects the patient may experience. The current standard dose of irinotecan was determined in clinical trials without knowing individual genotypes and thus does not take into account a patient’s ability to metabolize irinotecan. This means that based on one genotype the current standard dose of irinotecan may be correct or based on other genotypes the standard dose could result in lower and possibly less effective blood levels and result in significant under-dosing of irinotecan. Based on genotype the patient will be assigned to one of the following doses of irinotecan: * 180 mg/m2 (standard dose) * 260 mg/m2 * 310 mg/m2 The purpose of this research study is to determine if dosing irinotecan based on genotype is effective and safe for patients with colon cancer. Patient genotype will be determined from a small sample of blood and a laboratory test or "assay" performed at UNC Laboratories. For the purpose of this study, this assay is new and considered to be "investigational". This means that the genotype assay used in this study has not yet been approved by the FDA for determining irinotecan dose levels in patients with colon cancer.

DISEASE(S): Colon Cancer,Colonic Neoplasms

PROVIDER: 2166611 | ecrin-mdr-crc |

REPOSITORIES: ECRIN MDR

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Project description:Individuals with Urea Cycle Disorders (UCD) cannot remove ammonia, a waste product, from the blood. At present there is little information on the use of sodium phenylbutyrate (Buphenyl™) in children with argininosuccinic aciduria (ASA). It is hoped that this drug may help lower ammonia and argininosuccinic acid levels in patients with ASA. Through this study we hope to learn whether the use of sodium phenylbutyrate (Buphenyl™) in patients with ASA, in addition to diet and arginine therapy, will decrease liver damage and the number of periods during which ammonia levels are high. The primary study objective is to determine if the treatment of ASA patients with sodium phenylbutyrate (Buphenyl™) in conjunction with lowered doses of arginine improves liver function as measured by short-term assessment of synthetic activity and the use of stable isotope tracers to assess ureagenesis and nitric oxide production. Twelve patients with ASA will be studied using a randomized, cross-over design. Medical records will be reviewed to confirm the diagnosis prior to enrollment. Patients will be on the each arm of the study for one week each preceded by a three day washout period. Patients will come to the Baylor College of Medicine General Clinical Research Center in Texas Children's Hospital for an inpatient hospitalization. This hospitalization is for diet control, clinical evaluation, and stable isotope infusions for measurement of in vivo rates of ureagenesis and nitric oxide production. During the washout periods Buphenyl™ or other alternative route medications, e.g., benzoate, will be discontinued and arginine will be administered at the standard therapeutic dose of 500 mg/kg/day or 10 grams/m2. Following randomization, subjects will be maintained on either high-dose arginine (500 mg/kg/day or 10 grams/m2) alone, or the alternative of low-dose arginine (100 mg/kg/d or 2 grams/m2) along with sodium phenylbutyrate (500 mg/kg/day or 10 grams/m2). For the second week they will be crossed over to the other arm of the study preceded by another three day washout. Previous medications and dietary protein intake (0.6 g/kg/day or current metabolic diet) will be continued during both arms of the study. The two arms may be performed as separate ten-day admissions. The decision to design the study with two arms, high-dose arginine and low-dose arginine/Buphenyl™, was reached after weighing several considerations. First, the current accepted practice for treatment of ASA is high-dose arginine. Based on metabolic flux studies, we have quantified the effects of this dose of arginine as compared to standard doses of Buphenyl™/phenylacetate on ureagenesis. Since the study is not designed or intended to address the independent effects of Buphenyl™ as compared to arginine alone, Buphenyl™ was added for safety reasons to accommodate loss of clearance of nitrogen by decreasing the arginine dose. Moreover, based on our experience with recruiting for previous versions of this study, most ASA patients with liver dysfunction are on an alternative route ammonia scavenger medication in addition to arginine. We found that this has in fact become an accepted practice. Hence, when considering study design from both a safety and recruitment perspective, it was most reasonable to design the study to investigate specifically the hypothesis that the production and presence of argininosuccinic acid leads to liver dysfunction. Since both low-dose arginine with Buphenyl™ and high-dose arginine alone lead to a decreased production of argininosuccinic acid, and both are currently accepted therapies in ASA and UCDs in general, the need to address their effects distinctly is not being investigated at this time. Sodium phenylbutyrate dosage will be 500 mg/kg/day in patients weighing less than 20kg and 10 g/m2/day in larger patients. Daily dosage will be given in equally divided doses 4 times per day. In order to ensure that the study remains double-blind to investigators, study staff and subjects, the Investigational Pharmacy Service at Texas Children's Hospital will dispense both the Buphenyl™ and arginine in powder form which is compounded into capsules or will be mixed with syrpalta (up to 5 grams will dissolve in 10cc liquid) and administered orally or through nasogastric or gastrostomy tube. No nasogastric tube should be placed or gastrostomy performed solely for the purpose of inclusion in this study. Because the reported adverse effects of sodium phenylbutyrate include gastritis, participants will be started on a standard dose of ranitidine (Zantac™), or comparable drug, during both arms of the study.

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Genotype-Directed Study Of Irinotecan Dosing In FOLFIRI + BevacizumabTreated Metastatic Colorectal Cancer

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