Genotype-directed Phase II Study of Irinotecan Dosing in Metastatic Colorectal Cancer (mCRC) Patients Receiving FOLFIRI + Bevacizumab


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.


The purpose of this study is to determine if dosing irinotecan based on genotype is effective and safe for patients with colorectal cancer.


You may be eligible for this study if you meet the following criteria:

  • Conditions: Colorectal Cancer
  • Age: Between 18 Years - 100 Years
  • Gender: Male or Female

Inclusion Criteria
Histological or cytological documentation of adenocarcinoma of the colon or rectum
Measurable or non-measurable (but evaluable) disease as defined via RECIST 1.1
Metastatic disease not amenable to surgical resection with curative intent
No prior chemotherapy for metastatic disease
Eastern Cooperative Oncology Group (ECOG) performance status ? 2
Adequate bone marrow, renal and hepatic function
Willing to undergo UGT1A1 genotyping
Negative pregnancy test (urine or serum), within 7 day prior to Day 1 of FOLFIRI in women of childbearing potential
Women of childbearing potential and male subjects must agree to use adequate contraception for the duration of study participation. Adequate contraception is defined as any medically recommended method (or combination of methods) as per standard of care.
Exclusion Criteria
UGT1A1 genotype other than *1/*1, *1/*28, or *28/*28
Known dihydropyrimidine dehydrogenase (DPD) deficiency
Prior treatment with irinotecan and/or bevacizumab
Unable or unwilling to discontinue (and substitute if necessary) use of prohibited drugs for at least 14 days (fruits and juices for at least 7 days) prior to Day 1 of FOLFIRI + bevacizumab initiation (see section 11.2, Appendix B, for list of prohibited drugs)
Inadequately controlled hypertension (defined as systolic blood pressure > 140 mmHg and/or diastolic blood pressure > 90 mmHg)
Prior history of hypertensive encephalopathy
Active cardiac disease including any of the following:
New York Heart Association (NYHA) Grade II or greater congestive heart failure (see section 11.3, Appendix C)
History of myocardial infarction or unstable angina within 6 months prior to Day 1
History of stroke or transient ischemic attack within 6 months prior to Day 1 of FOLFIRI + bevacizumab initiation
Significant vascular disease (e.g., aortic aneurysm, requiring surgical repair or recent peripheral arterial thrombosis) within 6 months prior to Day 1 of FOLFIRI + bevacizumab initiation
History of hemoptysis (? 1/2 teaspoon of bright red blood per episode) within 1 month prior to Day 1 of FOLFIRI + bevacizumab initiation
Evidence of bleeding diathesis or significant coagulopathy (in the absence of therapeutic anticoagulation)
Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to Day 1 of FOLFIRI + bevacizumab initiation or anticipation of need for major surgical procedure during the course of the study
Core biopsy or other minor surgical procedure, excluding placement of a vascular access device, within 7 days prior to Day 1 of FOLFIRI + bevacizumab initiation
History of abdominal fistula or gastrointestinal perforation within 6 months prior to Day 1 of FOLFIRI + bevacizumab initiation
Serious, non-healing wound, active ulcer, or untreated bone fracture
Proteinuria as demonstrated by: Urine protein: creatinine (UPC) ratio ? 1.0 at screening OR Urine dipstick for proteinuria ? 2+ (patients discovered to have ?2+ proteinuria on dipstick urinalysis at baseline should undergo a 24 hour urine collection and must demonstrate ? 1g of protein in 24 hours to be eligible)
Any serious uncontrolled medical disorder that would impair the ability of the subject to receive protocol-driven therapy
Other anti-cancer or investigational therapy while patients are on study therapy

Additional Information:
Participants will not be paid for their participation.

Updated on 20 Nov 2022 . Study ID: TX4326

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