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Drugs
Published in: Drugs 8/2010

01-05-2010 | Adis Drug Evaluation

Panitumumab

A Review of its Use in Metastatic Colorectal Cancer

Author: Gillian M. Keating

Published in: Drugs | Issue 8/2010

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Abstract

Panitumumab (Vectibix®) is a recombinant, fully human, IgG2 anti-epidermal growth factor receptor (EGFR) monoclonal antibody. This article reviews the clinical efficacy of intravenous panitumumab in combination with chemotherapy in the first- and second-line treatment of metastatic colorectal cancer and as monotherapy in chemotherapy-refractory metastatic colorectal cancer, as well as summarizing its pharmacological properties and tolerability. Panitumumab is indicated for use in patients with wild-type rather than mutant KRAS tumours.
The efficacy of intravenous panitumumab 6 mg/kg administered every 2 weeks was examined in randomized, open-label, multicentre, phase III trials in patients with metastatic colorectal cancer. When administered as first- or second-line treatment in combination with chemotherapy, panitumumab plus chemotherapy prolonged progression-free survival to a significantly greater extent than chemotherapy alone in patients with wild-type KRAS tumours; no significant between-group difference in overall survival was seen in the second-line treatment trial. In patients with mutant KRAS tumours, progression-free survival was significantly shorter with panitumumab plus oxaliplatin-based chemotherapy than with oxaliplatin-based chemotherapy alone in the first-line treatment trial, with no significant difference between patients receiving panitumumab plus irinotecan-based chemotherapy (FOLFIRI) and those receiving FOLFIRI alone in the second-line treatment trial. In chemotherapy-refractory patients with metastatic colorectal cancer, panitumumab monotherapy plus best supportive care prolonged progression-free survival to a significantly greater extent than best supportive care alone in both the overall population and in patients with wild-type KRAS tumours, but not in those with mutant KRAS tumours; there was no significant between-group difference in overall survival.
Panitumumab has an acceptable tolerability profile when administered as monotherapy or in combination with chemotherapy. It is associated with the skin-related toxicities characteristic of EGFR inhibitors and appears to have a low risk of immunogenicity.
In conclusion, in patients with wild-type KRAS tumours, panitumumab is a useful option in combination with chemotherapy for the first- and second-line treatment of metastatic colorectal cancer or as monotherapy for the treatment of chemotherapy-refractory metastatic colorectal cancer.
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Metadata
Title
Panitumumab
A Review of its Use in Metastatic Colorectal Cancer
Author
Gillian M. Keating
Publication date
01-05-2010
Publisher
Springer International Publishing
Published in
Drugs / Issue 8/2010
Print ISSN: 0012-6667
Electronic ISSN: 1179-1950
DOI
https://doi.org/10.2165/11205090-000000000-00000

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