Overview
Panitumumab is a fully human monoclonal antibody designed to target the epidermal growth factor receptor (EGFR). It is primarily used in the treatment of metastatic colorectal cancer (mCRC) with wild-type RAS status. Unlike chimeric antibodies, panitumumab is less likely to induce immune responses due to its fully human structure. Approved by the FDA in 2006, panitumumab is marketed under the brand name Vectibix. It works by binding to EGFR, blocking the binding of natural ligands, and inhibiting tumor cell proliferation. This mechanism makes it a valuable therapeutic option for patients with EGFR-expressing tumors.
Physical and Chemical Properties
Panitumumab is a large protein molecule with a molecular weight of approximately 147 kDa. Its structure consists of two heavy chains and two light chains, typical of immunoglobulin G (IgG) antibodies. The solution form is clear and colorless, suitable for intravenous administration. The antibody is stable under refrigerated conditions (2-8°C) but should not be frozen or exposed to light. It is soluble in water and formulated as a sterile solution for injection. The precise physicochemical properties, such as melting and boiling points, are not typically specified for biologic drugs due to their complex nature.
Main Applications
Panitumumab is indicated for the treatment of metastatic colorectal cancer (mCRC) in patients with wild-type RAS tumors, as determined by diagnostic testing. It is often used in combination with chemotherapy or as a monotherapy for patients who have failed prior treatments. Clinical studies have demonstrated its efficacy in improving progression-free survival and overall response rates. Off-label uses are under investigation, including potential applications in other EGFR-positive cancers such as head and neck squamous cell carcinoma. However, these uses require further validation through clinical trials.
Safety and Storage
Panitumumab carries several safety warnings, including the risk of severe dermatologic reactions, electrolyte imbalances (e.g., hypomagnesemia), and infusion-related reactions. Patients should be monitored closely during and after administration. Proper storage is critical to maintaining the drug's efficacy. It must be kept refrigerated (2-8°C) and protected from light. Freezing or shaking the vials should be avoided. Once prepared for infusion, the solution is stable for up to 6 hours at room temperature or 24 hours under refrigeration.
B2B Procurement Guide
When procuring panitumumab for B2B purposes, buyers should prioritize suppliers with verified regulatory approvals (e.g., FDA, EMA) and robust cold chain logistics to ensure product integrity. Certifications such as Good Distribution Practice (GDP) are essential. Pricing varies significantly by region and volume, so obtaining multiple quotes is advisable. Buyers should also confirm batch testing and stability data. Due to the high cost and specialized storage requirements, partnering with experienced pharmaceutical distributors is recommended.
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