Panitumumab
Panitumumab is a fully human EGFR antibody, the preferred first-line partner for chemotherapy in left-sided, RAS-normal bowel cancer after the PARADIGM trial.
Fully human IgG2 anti-EGFR; fewer infusion reactions than cetuximab and no ADCC. PARADIGM (2022) established superiority over bevacizumab in left-sided RAS wild-type disease; PRIME established it with FOLFOX. Partner of sotorasib in KRAS G12C mCRC (CodeBreaK 300, approved 2025). Same RAS-testing requirement and skin toxicity as cetuximab.
1.Panitumumab binds EGFR on the tumour cell surface
- Route
- Intravenous
- Schedule
- 6 mg/kg every 2 weeks
- Dose modifications
- Withhold for grade 3-4 dermatologic toxicity
- Monitoring
- Electrolytes; skin
Source: www.accessdata.fda.gov/drugsatfda_docs/label/2021/125147s210lbl.pdf. Doses are for orientation; the current label governs.
- Medicare
- Part B (clinician-administered)
Given by infusion or injection in a clinic or hospital outpatient department, so it is a Part B drug: Medicare pays 80% after the Part B deductible and the patient owes 20% coinsurance, uncapped in Original Medicare unless a Medigap policy applies.
- Commercial insurance
- covered with prior authorisation
Covered under the medical benefit with prior authorisation confirming diagnosis, biomarker status and line of therapy; site-of-care policies may steer infusions away from hospital outpatient departments. RAS wild-type documentation required.
- Assistance programmes
- Amgen SupportPlus
- Amgen Safety Net Foundation
- PAN Foundation — Disease-specific co-pay and premium funds; open and closed funds change monthly.
- HealthWell Foundation
- CancerCare Co-Payment Assistance Foundation
- Patient Advocate Foundation Co-Pay Relief
20% Part B coinsurance on a high-cost infusion adds up quickly: Medigap Plan G or N, Medicare Advantage maximum out-of-pocket, Medicaid dual eligibility, or a charity fund are the usual buffers.
Sources: Medicare.gov: Chemotherapy · Medicare.gov: Prescription drugs (outpatient, Part B). Not medical or financial advice; verify with your plan.
- Appraised for
- With chemotherapy for untreated RAS wild-type metastatic colorectal cancer
- NHS England
- Routinely funded for the appraised indication (or via managed access)
Sources: NICE TA439 · SMC advice: panitumumab. Funding decisions are indication-specific and change monthly; verify with NICE and your treating team.
- Sept 2006ApprovalUS
Accelerated approval, refractory mCRC
- May 2014Label changeUS
First-line with FOLFOX in RAS wild-type (PRIME)
- Jan 2025ApprovalUS
With sotorasib for KRAS G12C mCRC (CodeBreaK 300)
Approvals
| Region | Year | Indication |
|---|---|---|
| US | 2006 | EGFR-expressing mCRC after chemotherapy (later RAS wild-type) |
| US | 2014 | First-line RAS wild-type mCRC with FOLFOX |
| US | 2025 | KRAS G12C mCRC with sotorasib |
| Adverse event |
|---|
| Dermatologic toxicity (rash, paronychia) |
| Hypomagnesaemia |
| Diarrhoea |
Very common; boxed warning. Events listed without rates were not read from a primary source; see the label. Blank cells mean the figure was not sourced, not that it is zero.
Trials
topRecruiting now (live from ClinicalTrials.gov)
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Landmark trials in OnCo
Latest papers
topQuery for this drug: (TITLE:"Panitumumab" OR ABSTRACT:"Panitumumab" OR TITLE:"Vectibix" OR ABSTRACT:"Vectibix") AND (cancer OR tumor OR tumour OR oncology OR carcinoma OR lymphoma OR leukemia OR leukaemia OR myeloma OR sarcoma OR melanoma OR glioma). Results are unfiltered search hits about Panitumumab, not a curated reading list.
Pages like this
not linked directly; found by shared links- TermSidedness (left vs right colon)
Shares Anti-EGFR antibody + chemotherapy in left-sided RAS/BRAF wild-type mCRC, PARADIGM, EGFR, Colorectal cancer.
- PairingKRAS G12C inhibitor + anti-EGFR antibody (colorectal)
Shares CodeBreaK 300, RAS / RAF / MEK / ERK (MAPK), EGFR, Colorectal cancer.
- Key paperCodeBreaK 300: sotorasib plus panitumumab in chemotherapy-refractory KRAS G12C colorectal cancer
Shares CodeBreaK 300, Amgen, Monoclonal antibodies, EGFR.
- ProductBemarituzumab
Shares Amgen, RAS / RAF / MEK / ERK (MAPK), Monoclonal antibodies.
- ProductCetuximab
Shares Anti-EGFR antibody + chemotherapy in left-sided RAS/BRAF wild-type mCRC, Receptor tyrosine kinase activation, RAS / RAF / MEK / ERK (MAPK), Monoclonal antibodies.
- TrialCRYSTAL & FIRE-3
Shares Anti-EGFR antibody + chemotherapy in left-sided RAS/BRAF wild-type mCRC, EGFR, Colorectal cancer.
- ProductFOLFIRI (5-FU, leucovorin, irinotecan)
Shares Anti-EGFR antibody + chemotherapy in left-sided RAS/BRAF wild-type mCRC, Colorectal cancer.
- Key paperBREAKWATER: encorafenib plus cetuximab with chemotherapy as first treatment for BRAF V600E-mutated colorectal cancer
Shares Takayuki Yoshino, Monoclonal antibodies, EGFR, Colorectal cancer.