Bevacizumab and Oxaliplatin Combined With Irinotecan or Leucovorin and Fluorouracil in Treating Patients With Metastatic or Recurrent Colorectal Cancer

OBJECTIVES:

- Compare the response rate (complete and partial), progression-free survival, and overall
survival of patients with previously untreated metastatic or locally recurrent
colorectal adenocarcinoma with high vs low thymidylate synthase (TS) expression treated
with fluorouracil, leucovorin calcium, oxaliplatin, and bevacizumab or irinotecan,
oxaliplatin, and bevacizumab.

- Compare the toxicity of these regimens in these patients.

- Correlate gene expression with response rates in patients treated with these regimens.

- Correlate gene expression with toxicity of these regimens in these patients.

- Correlate dihydropyrimidine dehydrogenase, thymidine phosphorylase, and mammalian
excision repair cross complementary protein expression with antitumor response in
patients treated with these regimens.

OUTLINE: This is a randomized, multicenter study. Patients are stratified according to
thymidylate synthase (TS) expression levels (high vs low or indeterminate). Patients with
high TS expression are randomized to 1 of 2 treatment arms (Arms A or B). Patients with low
or indeterminate TS expression are assigned to Arm C.

- Arm A: Patients receive bevacizumab IV over 30-90 minutes followed by oxaliplatin IV
over 2 hours and irinotecan IV over 90 minutes on days 1 and 15.

- Arm B: Patients receive bevacizumab and oxaliplatin as in arm A, leucovorin calcium IV
over 2 hours, and fluorouracil IV over 5 minutes and then continuously over 46 hours on
days 1 and 15.

- Arm C: Patients receive bevacizumab, oxaliplatin, leucovorin calcium, and fluorouracil
as in arm B.

In all arms, courses repeat every 28 days in the absence of unacceptable toxicity or disease
progression.

Patients are followed up every 3 months for 2 years and then every 6 months for 2 years from
the date of study registration.

INCLUSION:

- Metastatic or locally recurrent colorectal adenocarcinoma

- Measurable disease

- At least 2 formalin-fixed paraffin embedded core needle biopsies OR fine needle
aspirate containing a minimum of 3 clusters of malignant cells and fixed tissue from
the previous biopsy

- If no tissue samples are available the patient must be willing to undergo biopsy of a
metastatic site

- Age 18 and over

- Eastern Cooperative Oncology Group (ECOG) Performance status 0-2

- Absolute neutrophil count ≥ 1,500/mm^3

- Platelet count ≥ 100,000/mm^3

- Prothrombin time (PT)/international normalized ratio (INR) ≤ 1.5 unless patient is
receiving full-dose anticoagulants AND the following criteria are met:

- In-range INR (usually between 2 and 3) AND on a stable dose of warfarin or low
molecular weight heparin

- No active bleeding or pathological condition that is associated with a high risk
of bleeding

- Partial thromboplastin time (PTT) < 1.5 times upper limit of normal (ULN)

- Alanine transaminase (ALT) and aspartate aminotransferase (AST) < 3 times ULN

- Bilirubin ≤ 1.5 times ULN

- Creatinine ≤ 1.8 mg/dL

- Meets 1 of the following criteria:

- Protein negative on urine dipstick

- Urine protein/creatinine ratio < 1.0

- Less than 2 g protein on 24-hour urine collection

- Patients with a history of hypertension must meet the following criteria:

- Blood pressure < 150/90 mm Hg

- Stable regimen of anti-hypertensive therapy

- More than 28 days since prior major or open surgery

- Negative pregnancy test

- Fertile patients must use effective contraception during and for 3 months after study
participation

- Prior non-colorectal malignancies are allowed provided the following criteria are met:

- No current clinical evidence of persistent or recurrent disease

- No active therapy for non-colorectal malignancy, including hormonal therapy

EXCLUSION:

- Pregnant or nursing

- Arterial thromboembolic events within the past 6 months, including the following:

- Transient ischemic attack

- Cerebrovascular accident

- Unstable angina pectoris

- Myocardial infarction

- Symptomatic arrhythmia

- Symptomatic congestive heart failure

- Clinically significant peripheral artery disease

- New York Heart Association class III or IV heart disease

- Serious nonhealing wound, ulcer, or bone fracture within the past 28 days

- Significant traumatic injury within the past 28 days

- Neuropathy ≥ grade 2

- Ongoing or active infection

- Concurrent prophylactic filgrastim (G-CSF) or sargramostim (GM-CSF)

- Prior chemotherapy for metastatic disease. Adjuvant therapy completed at least 12
months before first evidence of metastasis allowed

- Cardiovascular, renal, hepatic, or other nonmalignant systemic disease that would
preclude study therapy