Cetuximab With or Without Carboplatin in Treating Women With Estrogen Receptor-Negative, Progesterone Receptor-Negative Metastatic Breast Cancer

OBJECTIVES:

Primary

- Compare the overall response rate in women with estrogen receptor-negative,
progesterone receptor-negative, HER2-nonoverexpressing metastatic breast cancer treated
with cetuximab with vs without carboplatin.

Secondary

- Compare the time to disease progression in patients treated with these regimens.

- Correlate downstream effects of EGFR inhibitor on MAPK, AKT, Ki67, and EGFR-dependent
signaling, proliferation, and apoptosis with toxicity and response in patients with
accessible tumors treated with these regimens.

- Determine the changes in biomarkers and gene expression in circulating tumor cells
during treatment.

- Compare the overall survival rate in patients treated with these regimens.

OUTLINE: This is a randomized, multicenter study. Patients are randomized to 1 of 2
treatment arms.

- Arm I: Patients receive cetuximab IV over 60-120 minutes once a week.

- Arm II: Patients receive cetuximab as in arm I and carboplatin IV on days 1, 8, and 15.

In both arms, treatment repeats every 28 days in the absence of disease progression or
unacceptable toxicity. Patients not responding to treatment in arm I may cross over to arm
II.

Blood samples are collected periodically throughout study for correlative biomarker analysis
by IHC and gene expression analysis.

After completion of study treatment, patients are followed every 4 months.

DISEASE CHARACTERISTICS:

- Histologically confirmed breast cancer

- Metastatic (stage IV) disease

- Measurable disease by RECIST criteria

- Irradiated lesions are not considered measurable disease

- CNS metastases allowed if disease is stable (no evidence of progression) ≥ 3 months
after local therapy

- No lesions identifiable only by PET scan

- HER2 nonoverexpressing disease by IHC (0 or 1) or non-gene amplified by FISH

- HER2 2+ by IHC allowed

- Hormone receptor status:

- Estrogen receptor-negative and progesterone receptor-negative tumor

PATIENT CHARACTERISTICS:

- ECOG performance status 0-2

- Life expectancy ≥ 6 months

- ANC ≥ 1,500/mm³

- Platelet count ≥ 100,000/mm³

- Creatinine clearance ≥ 50 mL/min

- ALT and AST ≤ 2.5 times upper limit of normal (ULN) (≤ 5 times ULN in case of liver
metastases)

- Bilirubin ≤ 1.5 mg/dL

- Not pregnant or nursing

- Negative pregnancy test

- Fertile patients must use effective contraception

- No significant history of uncontrolled cardiac disease including, but not limited to,
any of the following:

- Uncontrolled hypertension

- Unstable angina

- Recent myocardial infarction (within the past 6 months)

- Uncontrolled congestive heart failure

- Cardiomyopathy that is either symptomatic or asymptomatic but with decreased
ejection fraction < 45%

- No history of severe infusion reaction to monoclonal antibody treatment

- No uncontrolled infection

- No major medical condition (i.e., uncontrolled pulmonary, renal, or hepatic
dysfunction) that may affect study participation

- No other significant comorbid condition that may compromise effective and safe
participation in the study

PRIOR CONCURRENT THERAPY:

- See Disease Characteristics

- At least 3 weeks since prior chemotherapy

- At least 2 weeks since prior radiation therapy

- No more than 3 prior chemotherapy regimens either in the adjuvant or metastatic
setting

- Sequential regimens (e.g., anthracycline-paclitaxel) are considered 1 regimen

- No prior therapy that specifically and directly targets the EGFR pathway with
therapeutic intent

- No prior platinum agent for metastatic disease

- Prior platinum agents in the adjuvant setting allowed provided there was a
disease-free interval that lasted for ≥ 12 months prior to relapse

- Concurrent bisphosphonates allowed

- Bone lesions may not be used to measure progression or response