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Monoclonal antibody
TypeWhole antibody
SourceChimeric (mouse/human)
TargetEGF receptor
Clinical data
Trade namesErbitux
License data
  • AU: D
Routes of
ATC code
Legal status
Legal status
Pharmacokinetic data
Elimination half-life114 hrs
CAS Number
  • none
CompTox Dashboard (EPA)
Chemical and physical data
Molar mass145781.92 g·mol−1
 ☒NcheckY (what is this?)  (verify)

Cetuximab, sold under the brand name Erbitux, is an epidermal growth factor receptor (EGFR) inhibitor medication used for the treatment of metastatic colorectal cancer and head and neck cancer.[1] Cetuximab is a chimeric (mouse/human) monoclonal antibody given by intravenous infusion.[1]

In July 2009, the U.S. Food and Drug Administration (FDA) approved cetuximab (Erbitux) for treatment of colon cancer with wild-type KRAS, since it had little or no effect in colorectal tumors harboring a KRAS mutation (this also applied to the EGFR antibody panitumumab).[3] This was the first genetic test to guide treatment of cancer.[4] In July 2012, the FDA approved a real time PCR companion diagnostic test for KRAS, the therascreen KRAS test.[5]

Medical uses[edit]

In the US, cetuximab is indicated for treatment of head and neck cancer and colorectal cancer.[1]

In the EU, cetuximab is indicated for the treatment of epidermal growth factor receptor (EGFR)-expressing, RAS wild-type metastatic colorectal cancer and for the treatment of squamous cell cancer of the head and neck.[2]

A diagnostic immunohistochemistry assay (EGFR pharmDx) can be used to detect EGFR expression in the tumor material. Approximately 75% of patients with metastatic colorectal cancer have an EGFR-expressing tumor and are therefore considered eligible for treatment with cetuximab or panitumumab, according to FDA guidelines. Unfortunately, there is evidence that immunohistochemical EGFR receptor testing does not predict response to either cetuximab or panitumumab, so that this has been called a "misleading biomarker" that has nevertheless caused insurers and even health systems to deny payment for EGFR antibody treatment for patients who lack a positive tumor EGFR histochemical test.[4]

Head and neck cancer[edit]

Cetuximab was approved by the US Food and Drug Administration (FDA) in March 2006, for use in combination with radiation therapy for treating squamous cell carcinoma of the head and neck (SCCHN) or as a single agent in patients who have had prior platinum-based therapy.[6]

Side effects[edit]

One of the more serious side effects of cetuximab therapy is the incidence of acne-like rash. This rash rarely leads to dose reductions or termination of therapy. It is generally reversible.[7]

Further severe infusion reactions include but are not limited to: fevers, chills, rigors, urticaria, itchiness, rash, hypotension, nausea, vomiting, headache, shortness of breath, wheezing, angioedema, dizziness, anaphylaxis, and cardiac arrest. Other common side effects include photosensitivity, hypomagnesemia due to magnesium wasting, and less commonly pulmonary and cardiac toxicity.[8]

Alpha-gal allergy[edit]

Certain geographic regions have a high rate of anaphylactic reactions to cetuximab upon the first exposure to the medication. This is unusual because exposure to the allergen must occur before the development of an allergy. Fewer than 1% of people in the northeast United States reacted, while greater than 20% in the southeast did.[9][10]

Mechanism of action[edit]

Cetuximab is a chimeric (mouse/human) monoclonal antibody which binds to and inhibits EGFR.[10]

KRAS Testing[edit]

The KRAS gene encodes a small G protein on the EGFR pathway. Cetuximab and other EGFR inhibitors only work on tumors in which KRAS is not mutated.[11][12]

In July 2009, the US Food and Drug Administration (FDA) updated the labels of two anti-EGFR monoclonal antibody drugs (panitumumab (Vectibix) and cetuximab (Erbitux)) indicated for treatment of metastatic colorectal cancer to include information about KRAS mutations.[3]

Studies have indicated that detection of KRAS gene mutations helps physicians identify patients that are unlikely to respond to treatment with targeted EGFR inhibitors, including cetuximab and panitumumab. Accordingly, genetic testing to confirm the absence of KRAS mutations (and so the presence of the KRAS wild-type gene), is now clinically routine before the start of treatment with EGFR inhibitors. mCRC patients with wild-type KRAS tumors have been shown to benefit from a response rate of over 60% and a decreased risk for progression of over 40% when treated with Erbitux as 1st-line therapy.[medical citation needed] Around 65% of mCRC patients have the KRAS wild-type gene.[medical citation needed]


Observations on EGFR inhibition were published in 1988.[13] Yeda Research, on behalf of the Weizmann Institute of Science in Israel,[14] challenged the Aventis-owned patent,[15] licensed by Imclone, for the use of anti-epidermal growth factor receptor antibodies in combination with chemotherapy, to slow the growth of certain tumors which was filed in 1989 by Rhone-Poulenc-Rorer.[16] The court ruled that Yeda is sole owner of the patent in the U.S., while Yeda and Sanofi-Aventis co-own the patent's foreign counterparts.[17][18][19]

Society and culture[edit]


  • Eli Lilly and Company is responsible for the manufacture and supply of Erbitux in bulk-form active pharmaceutical ingredient (API) for clinical and commercial use in the U.S. and Canada.
  • Merck KGaA manufactures Erbitux for supply in its territory (outside the U.S. and Canada) as well as for Japan.[20]


  • Erbitux is marketed in the U.S. and Canada by Eli Lilly.
  • Outside the U.S. and Canada, Erbitux is commercialized by Merck KGaA. Eli Lilly receives royalties from Merck KGaA.
  • A separate agreement grants co-exclusive rights among Merck, Bristol-Myers Squibb and Eli Lilly in Japan and expires in 2032.[20]


Cetuximab is given by intravenous therapy and costs up to $30,000 for eight weeks of treatment per patient.[21]

Merck KGaA had 887 million euros ($1.15 billion) in Erbitux sales in 2012, from head and neck as well as bowel cancer, while Bristol-Myers Squibb generated $702 million in sales from the drug.[22]

Erbitux was the eighth best-selling cancer drug of 2013, with sales of $1.87 billion.[23]


Erbitux had 2013 worldwide sales of US$1.9 billion making it a lucrative target for biosimilars developers. Additionally the patent protection for Erbitux in Europe expired in June 2014, and in the U.S. and in Japan the protection will expire in 2016.[24] However biosimilars of Erbitux are not expected until 2018.[25]

As of 2014, biosimilars of cetuximab were in development by several companies.[26][27]

Insider trading[edit]

Cetuximab failed to get FDA approval in 2001, which caused the stock price of the developer ImClone to drop dramatically. Prior to the announcement, several executives sold stock, and the SEC launched an investigation into insider trading. This resulted in a widely publicized criminal case, which resulted in prison terms for media celebrity Martha Stewart, ImClone chief executive officer Samuel D. Waksal and Stewart's broker at Merrill Lynch, Peter Bacanovic.[28][29]


The efficacy of cetuximab was explored in a clinical trial of advanced gastric cancer published in 2013; cetuximab showed no survival benefit.[30]

A 2020 phase III multicenter randomized controlled trial headed by University College London showed that adding cetuximab to perioperative chemotherapy worsened survival for colorectal cancer patients with operable liver metastases. With over 5 years of follow-up, median overall survival (OS) dropped from 81 months for patients treated with chemotherapy alone before and after liver resection, to 55.4 months for those that also received cetuximab.[31]


  1. ^ a b c d "Erbitux- cetuximab solution". DailyMed. 27 September 2021. Retrieved 2 June 2022.
  2. ^ a b "Erbitux EPAR". European Medicines Agency. Retrieved 2 June 2022.
  3. ^ a b "Class Labeling Changes to anti-EGFR monoclonal antibodies, cetuximab (Erbitux) and panitumumab (Vectibix): KRAS Mutations". U.S. Food and Drug Administration (FDA). 2010-01-11.
  4. ^ a b Messersmith WA, Ahnen DJ (October 2008). "Targeting EGFR in colorectal cancer". The New England Journal of Medicine. 359 (17): 1834–6. doi:10.1056/NEJMe0806778. PMID 18946069.
  5. ^ "Therascreen KRAS RGQ PCR Kit – P110030". Device Approvals and Clearances. U.S. Food and Drug Administration (FDA). 2012-07-06.
  6. ^ "Cetuximab Beneficial in Head and Neck Cancer". Cancer.gov National Cancer Institute. Archived from the original on 2010-12-21. Retrieved 2013-04-13.
  7. ^ Nguyen A, Hoang V, Laquer V, Kelly KM (December 2009). "Angiogenesis in cutaneous disease: part I". Journal of the American Academy of Dermatology. 61 (6): 921–42, quiz 943-4. doi:10.1016/j.jaad.2009.05.052. PMID 19925924.
  8. ^ 8. Micromedex Healthcare Series [Internet database]. Greenwood Village, Colo: Thomson Healthcare. Updated periodically
  9. ^ Berg EA, Platts-Mills TA, Commins SP (February 2014). "Drug allergens and food--the cetuximab and galactose-α-1,3-galactose story". Annals of Allergy, Asthma & Immunology. 112 (2): 97–101. doi:10.1016/j.anai.2013.11.014. PMC 3964477. PMID 24468247.
  10. ^ a b Chung CH, Mirakhur B, Chan E, Le QT, Berlin J, Morse M, et al. (March 2008). "Cetuximab-induced anaphylaxis and IgE specific for galactose-alpha-1,3-galactose". The New England Journal of Medicine. 358 (11): 1109–17. doi:10.1056/NEJMoa074943. PMC 2361129. PMID 18337601.
  11. ^ Van Cutsem E, Köhne CH, Hitre E, Zaluski J, Chang Chien CR, Makhson A, et al. (April 2009). "Cetuximab and chemotherapy as initial treatment for metastatic colorectal cancer". The New England Journal of Medicine. 360 (14): 1408–17. doi:10.1056/NEJMoa0805019. PMID 19339720.
  12. ^ Bokemeyer C, Van Cutsem E, Rougier P, Ciardiello F, Heeger S, Schlichting M, et al. (July 2012). "Addition of cetuximab to chemotherapy as first-line treatment for KRAS wild-type metastatic colorectal cancer: pooled analysis of the CRYSTAL and OPUS randomised clinical trials". European Journal of Cancer. 48 (10): 1466–75. doi:10.1016/j.ejca.2012.02.057. PMID 22446022.
  13. ^ Aboud-Pirak E, Hurwitz E, Pirak ME, Bellot F, Schlessinger J, Sela M (December 1988). "Efficacy of antibodies to epidermal growth factor receptor against KB carcinoma in vitro and in nude mice". Journal of the National Cancer Institute. 80 (20): 1605–11. doi:10.1093/jnci/80.20.1605. PMID 3193478.
  14. ^ "Yeda Research and Development Company Ltd". Archived from the original on 2016-12-04. Retrieved 2013-01-05. Technology Transfer Company of the Weizmann Institute of Science
  15. ^ Groombridge N, Gearing BP (February 2008). "Practical lessons from a "made for TV" patent litigation: The trial of Yeda Research & Development Co. Ltd. v. ImClone Systems Inc. and Aventis Pharmaceuticals Inc" (PDF). The Federal Lawyer: 51–55. Archived from the original (PDF) on 2009-09-03.
  16. ^ US patent 6217866, Sela M, Pirak E, Hurwitz E, "Monoclonal antibodies specific to human epidermal growth factor receptor and therapeutic methods employing same", published 2001-04-17, assigned to Yeda Research & Development 
  17. ^ "Court ruling on Yeda vs Aventis/Imclone case" (PDF). Archived from the original (PDF) on 2011-09-27. Retrieved 2012-05-25.
  18. ^ "Yeda Research v. Imclone Systems, et al". Archived from the original on 2015-11-20. Retrieved 2015-08-30.
  19. ^ "ImClone goes up against patent dispute". USA Today. 2006-09-14.
  20. ^ a b Eli Lilly and Company Form 10-K Annual Report 2013
  21. ^ Schrag D (July 2004). "The price tag on progress--chemotherapy for colorectal cancer". The New England Journal of Medicine. 351 (4): 317–9. doi:10.1056/NEJMp048143. PMID 15269308.
  22. ^ Merck KGaA's Erbitux beats Avastin in bowel cancer trial, Reuters, Jun 1 2013
  23. ^ Top 10 best-selling cancer drugs of 2013; May 29, 2014
  24. ^ Bristol-Myers Squibb Company 2013 Form 10-K
  25. ^ Merck Serono Investor & Analyst Day 2014 – Belen Garijo’s presentation – Slide 41. 18 Sept 2014
  26. ^ Generics and Biosimilars Initiative (GaBI) – Biosimilars of cetuximab – 14/08/2014
  27. ^ Torrent Pharma, Reliance Life sign licensing agreement for biosimilars
  28. ^ "MARTHA STEWART'S SENTENCE: THE OVERVIEW; 5 Months in Jail, and Stewart Vows, 'I'll Be Back'". The New York Times. 17 July 2004. Retrieved 2 June 2022.
  29. ^ Bennett, Chuck (19 August 2008). "'HALF' LIFE OF MARTHA CONVICT". New York Post. Retrieved 2 June 2022.
  30. ^ Li K, Li J (2016). "Current Molecular Targeted Therapy in Advanced Gastric Cancer: A Comprehensive Review of Therapeutic Mechanism, Clinical Trials, and Practical Application". Gastroenterology Research and Practice. 2016: 4105615. doi:10.1155/2016/4105615. PMC 4736909. PMID 26880889.
  31. ^ Bridgewater JA, Pugh SA, Maishman T, Eminton Z, Mellor J, Whitehead A, et al. (March 2020). "Systemic chemotherapy with or without cetuximab in patients with resectable colorectal liver metastasis (New EPOC): long-term results of a multicentre, randomised, controlled, phase 3 trial". The Lancet. Oncology. 21 (3): 398–411. doi:10.1016/S1470-2045(19)30798-3. PMC 7052737. PMID 32014119.

External links[edit]