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Monoclonal antibody
Type Bi-specific T-cell engager
Source Mouse
Target EpCAM
Clinical data
ATC code
  • none
CAS Number
  • none

Solitomab (INN) (MT110) is an artificial bispecific monoclonal antibody that is being investigated as an anti-cancer drug. It is a fusion protein consisting of two single-chain variable fragments (scFvs) of different antibodies on a single peptide chain of about 55 kilodaltons. One of the scFvs binds to T cells via the CD3 receptor, and the other to EpCAM as a tumor antigen against gastrointestinal, lung, and other cancers.[1][2][3]

Mechanism of action[edit]

A BiTE linking a T cell to a tumor cell.

Like other bispecific antibodies, and unlike ordinary monoclonal antibodies, solitumab forms a link between T cells and its target tumor cell antigen. This causes T cells to exert cytotoxic activity on tumor cells by producing proteins like perforin and granzymes, independently of the presence of MHC I or co-stimulatory molecules. These proteins enter tumor cells and initiate the cell's apoptosis.[1][4] This action mimics physiological processes observed during T cell attacks against tumor cells.[4]


  1. ^ a b Helwick, Caroline (1 June 2008). "Novel BiTE antibody mediates contact between T cells and cancer cells". Oncology NEWS International. 17 (6). 
  2. ^ Clinical trial number NCT00635596 for "Phase I Study of MT110 in Colorectal Cancer (CRC), Gastrointestinal (GI) and Lung Cancer (MT110-101)" at
  3. ^ Amann, M.; d'Argouges, S.; Lorenczewski, G.; Brischwein, K.; Kischel, R.; Lutterbuese, R.; Mangold, S.; Rau, D.; Volkland, J.; Pflanz, S.; Raum, T.; Münz, M.; Kufer, P.; Schlereth, B.; Baeuerle, P. A.; Friedrich, M. (2009). "Antitumor Activity of an EpCAM/CD3-bispecific BiTE Antibody During Long-term Treatment of Mice in the Absence of T-cell Anergy and Sustained Cytokine Release". Journal of Immunotherapy. 32 (5): 452–464. PMID 19609237. doi:10.1097/CJI.0b013e3181a1c097. 
  4. ^ a b "BiTE Antibody Platform". Micromet Inc.