A Phase 2 Study of Panitumumab in Patients With Cetuximab-refractory Metastatic Colorectal Cancer

Study Overview
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Brief Summary
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The purpose of this study is to assess if panitumumab is active enough to warrant comparative studies in patients with metastatic colorectal cancer that has progressed after treatment with cetuximab.

Detailed Description
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The study was amended with modification of inclusion criteria (from wild-type tumor KRAS gene to wild-type RAS gene, including KRAS and NRAS exons 2, 3 and 4) RAS mutational status of tumors of patients enrolled before amendment 1 approval will be centrally revised. Patients whose tumors will result RAS mutated at the biomarkers central revision, will be replaced. Therefore, the overall sample size at both the stages may be higher than the one initially planned.

Official Title
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A Phase 2 Study of Panitumumab in Patients With Cetuximab-refractory Metastatic Colorectal Cancer

Conditions
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Metastatic Colorectal Cancer

Intervention / Treatment
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* Drug: Panitumumab


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Pathologic diagnosis of metastatic colorectal adenocarcinoma a wild-type RAS tumor (mutational status has to be determined by an experienced laboratory using validated test methods for detection of KRAS exons 2, 3, and 4, and NRAS exons 2, 3, and 4 Failure from previous treatment with fluoropyrimidine, oxaliplatin and irinotecan. Patients may or may not have been treated with bevacizumab. Documented disease progression following a treatment with cetuximab in patients who showed either an objective response after 8 weeks or stable disease after 16 weeks of cetuximab treatment. Age at least 18 years ECOG Performance Status 0-2 Neutrophils at least 1,500 mm3, platelets at least 100,000 mm3, and hemoglobin at least 9 g/dL Bilirubin level less than 1.5 times ULN AST (SGOT) and ALT (SGPT) not greater than 2.5 times ULN (or 5 times ULN in presence of liver metastasis) Serum creatinine less than 1.5 times ULN Effective contraception, if the risk of conception exists Life expectancy at least 3 months Written informed consent Exclusion Criteria: Symptomatic brain metastasis Interstitial pneumonitis or pulmonary fibrosis Any other malignancies within 5 years (except for adequately treated carcinoma in situ of the cervix or non melanoma skin cancer) Chemotherapy, radiotherapy or immunotherapy within the past 4 weeks Any unstable systemic disease (including active infections, any significant hepatic, renal or metabolic disease), metabolic dysfunction, physical examination finding, or clinical laboratory finding that contraindicates the use of study drugs or render the patient at high risk from treatment complications Subject pregnant or breast feeding, or planning to become pregnant within 6 months after the end of treatment

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Panitumumab<br> | Drug: Panitumumab<br>* 6mg/kg IV given every 2 weeks until disease progression or unacceptable toxicity<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| number of patients alive and without disease progression | progression of disease within 2 months from registration according to RECIST criteria, and death for any cause within 2 months from registration | 2 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| response rate | Response assessed per patients at weeks 8,16,24,32,40 and every 3 months thereafter, using RECIST criteria | up to 40 weeks | 
| progression free survival |  | 9 months | 
| overall survival |  | one year | 
| worst grade toxicity per patient | worst grade toxicity (according to Common Terminology Criteria for Adverse Events version 3) per patient | every 2 weeks for up to 6 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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cetuximab-refractory