OnCo
drugsProductApproved2006🇪🇺🇬🇧🇯🇵🇨🇳🇦🇺

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.

Schematic of the modality · Monoclonal antibody (anti-EGFR) · not a molecule; see the Monoclonal antibodies page
Mechanism, step by step
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1.Panitumumab binds EGFR on the tumour cell surface

Modality
Monoclonal antibody (anti-EGFR)
Mechanism
High-affinity EGFR blockade without effector function.
Brand / code
Vectibix
Dosing & schedule
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.

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.

NICE recommendedNICE TA439 · 2017SMC: accepted
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.

Regulatory

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  1. Sept 2006ApprovalUS

    Accelerated approval, refractory mCRC

  2. May 2014Label changeUS

    First-line with FOLFOX in RAS wild-type (PRIME)

  3. Jan 2025ApprovalUS

    With sotorasib for KRAS G12C mCRC (CodeBreaK 300)

Approvals

RegionYearIndication
US2006EGFR-expressing mCRC after chemotherapy (later RAS wild-type)
US2014First-line RAS wild-type mCRC with FOLFOX
US2025KRAS G12C mCRC with sotorasib

Safety

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Toxicity profile
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

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ClinicalTrials.gov · phase 2/3
refreshed 2026-09-09
234 studies10 recruiting79 Phase 222 Phase 3
Search “Panitumumab” on ClinicalTrials.gov →
Counts are from a name search and may include unrelated studies; up to 100 studies are summarised.

Recruiting now (live from ClinicalTrials.gov)

Recruiting trials near you · live from ClinicalTrials.gov
Panitumumab
intervention: Panitumumab
Open on ClinicalTrials.gov →

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Landmark trials in OnCo

Latest papers

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Literature trend99 papers in the last 12 months+10% vs prior 12How this is computed
Latest papers · live from Europe PMC
Open in Europe PMC

Query 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.

Connected

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