Ontuxizumab

Last updated November 26, 2025

Ontuxizumab
Monoclonal antibody
Type	Whole antibody
Source	Chimeric/humanized hybrid (mouse/human)
Target	TEM1
Clinical data
ATC code	none
Identifiers
CAS Number	946415-62-9
ChemSpider	none
UNII	0M2XT000YC
Chemical and physical data
Formula	C₆₅₃₂H₁₀₀₅₀N₁₇₂₆O₂₀₅₄S₄₄
Molar mass	147034.92 g·mol⁻¹

Ontuxizumab^[1] is a humanized rabbit monoclonal antibody^[2] designed for the treatment of cancer. It binds to endosialin (TEM1 or CD248).^[3]

Phase I trials are complete and the drug was granted orphan drug status by the FDA for sarcoma. It is currently in phase II trials for melanoma, colorectal cancer, sarcoma, and lymphoma.^[4]

This drug was developed by Morphotek and Ludwig Institute for Cancer Research.^[4]

References

↑ World Health Organization (2013). "International Nonproprietary Names for Pharmaceutical Substances (INN). Proposed INN: List 109" (PDF). WHO Drug Information. 27 (2).
↑ US 20100260769,Sass PM, Kline B, Nicolaides N, Grasso L, Harley S,"Endosialin binding molecules",published 2010-04-08, assigned to Morphotek Inc
↑ Kiyohara E, Donovan N, Takeshima L, Huang S, Wilmott JS, Scolyer RA, et al. (August 2015). "Endosialin Expression in Metastatic Melanoma Tumor Microenvironment Vasculature: Potential Therapeutic Implications". Cancer Microenvironment. 8 (2): 111–8. doi:10.1007/s12307-015-0168-8. PMC 4542822 . PMID 26085332.
1 2 "Ontuxizumab". Adis Insight. Springer Nature Switzerland AG.

Monoclonal antibodies for tumors

Tumor

Human	Adecatumumab ^§ Amivantamab Ascrinvacumab ^§ Balstilimab ^† Botensilimab Cixutumumab ^§ Conatumumab ^§ Cosibelimab Daratumumab Drozitumab ^§ Duligotumab ^§ Dusigitumab ^§ Enfortumab vedotin Enoticumab ^§ Figitumumab ^§ Flanvotumab ^§ Ganitumab ^† Glembatumumab vedotin ^† Intetumumab ^§ Ipilimumab Iratumumab ^§ Istiratumab Icrucumab ^§ Lexatumumab ^§ Linvoseltamab Lucatumumab ^§ Mapatumumab ^§ Narnatumab ^§ Necitumumab Nesvacumab ^§ Nivolumab ^# (+hyaluronidase, +relatlimab) Ofatumumab Olaratumab ^† Panitumumab Patritumab ^§ Pritumumab ^§ Radretumab ^§ Ramucirumab Rilotumumab ^† Robatumumab ^§ Seribantumab ^§ Sugemalimab Tarextumab ^§ Tisotumab vedotin Teprotumumab ^† Tovetumab ^§ Vantictumab ^§ Votumumab ^§ Zalutumumab ^†
Mouse	Abagovomab Altumomab pentetate Anatumomab mafenatox Arcitumomab Bectumomab Blinatumomab Capromab pendetide Detumomab Edrecolomab Ibritumomab tiuxetan Igovomab Lilotomab Minretumomab Mitumomab Nacolomab tafenatox Moxetumomab pasudotox Naptumomab estafenatox Oregovomab Pemtumomab ^† Racotumomab Satumomab pendetide Solitomab Taplitumomab paptox Nofetumomab merpentan Pintumomab Tenatumomab Tositumomab
Chimeric	Amatuximab ^§ Bavituximab ^§ Brentuximab vedotin Carotuximab ^† Cetuximab Derlotuximab biotin ^§ Dinutuximab Ecromeximab ^§ Ensituximab ^§ Futuximab ^§ Girentuximab ^† Indatuximab ravtansine ^§ Isatuximab Loncastuximab tesirine Margetuximab Mirvetuximab soravtansine Rituximab ^# Siltuximab Ublituximab Zolbetuximab
Humanized	Abituzumab ^§ Alemtuzumab Atezolizumab (+hyaluronidase) Axatilimab Belantamab mafodotin Bevacizumab Bivatuzumab mertansine ^§ Brontictuzumab ^§ Cantuzumab mertansine ^§ Cantuzumab ravtansine ^§ Cirmtuzumab Citatuzumab bogatox ^§ Clivatuzumab tetraxetan Cofetuzumab pelidotin Dacetuzumab ^§ Demcizumab ^§ Dalotuzumab ^§ Datopotamab deruxtecan Denintuzumab mafodotin ^§ Elotuzumab Emactuzumab Emibetuzumab ^§ Enoblituzumab ^§ Epcoritamab Etaracizumab ^§ Farletuzumab ^§ Ficlatuzumab ^§ Flotetuzumab ^§ Gemtuzumab ozogamicin Glofitamab Imgatuzumab ^§ Inotuzumab ozogamicin Labetuzumab ^§ Lifastuzumab vedotin ^§ Lintuzumab ^§ Lorvotuzumab mertansine ^§ Lumretuzumab ^§ Matuzumab ^§ Milatuzumab ^§ Naxitamab Nimotuzumab ^† Obinutuzumab Ocaratuzumab ^§ Odronextamab Otlertuzumab ^§ Onartuzumab ^§ Oportuzumab monatox ^† Parsatuzumab ^§ Pembrolizumab ^# (+berahyaluronidase alfa) Penpulimab Pertuzumab Pinatuzumab vedotin ^§ Polatuzumab vedotin Rosmantuzumab Rovalpituzumab tesirine ^† Sacituzumab govitecan Sibrotuzumab ^§ Simtuzumab ^§ Sofituzumab vedotin ^§ Tacatuzumab tetraxetan ^§ Tigatuzumab ^§ Trastuzumab ^# (+deruxtecan / +emtansine) Tucotuzumab celmoleukin ^§ Vandortuzumab vedotin ^§ Vanucizumab ^§ Veltuzumab ^§ Vorsetuzumab mafodotin ^§ Zenocutuzumab
Rat/mouse hybrid	Catumaxomab Ertumaxomab ^§
Chimeric + humanized	Depatuxizumab mafodotin ^† Duvortuxizumab Ontuxizumab ^§

^# WHO-EM
^‡ Withdrawn from market
Clinical trials:
- ^† Phase III
- ^§Never to phase III

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