Molecular Templates, Inc.


Next Generation Immunotoxins

ETBs are a proprietary biologic platform for designing and generating molecules with unique biologic properties for activity in cancer.

Combining the Specificity of an Antibody with the Potent Mechanism of Cell Destruction

ETBs utilize an antibody domain fused to a genetically engineered version of the Shiga-like Toxin A subunit (SLTA), a ribosome inactivating bacterial protein that can induce its own entry into a cell when proximal to the cell surface membrane, self-route to the cytosol, and enzymatically and irreversibly shut down protein synthesis via ribosome destruction resulting in cell death.

Our Differentiated Approach

A New ETB Scaffold for Rapid Screening and Scalable Production

Molecular Templates has created a new modular scaffold featuring the ability to induce targeted internalization, a differentiated mechanism of action, and a predictable PK and ADME profile. ETBs have been well-tolerated in clinical studies to date as monotherapy and in combination with standards of care. 

Continued De-Risking of the ETB Platform


Ribosome inactivation + forced internalization + de-immunization + antigen-seeding

MT-6402 is a 3rd generation ETB that targets PD-L1, a poorly internalizing receptor expressed on various solid tumors. MT-6402 shares the de-immunized scaffold used with 2nd-generation ETBs and is further engineered to deliver a viral foreign class I peptide (antigen seeding) to alter the tumor immunophenotype. MT-6402 utilizes Antigen Seeding Technology and is designed to deliver a foreign class I viral antigen derived from cytomegalovirus (CMV) inside the tumor for presentation on the tumor cell surface in complex with MHC class I molecules. Pre-clinically, MTEM has shown that antigen seeding allows CMV-reactive T-cells to recognize and destroy tumor cells. T-cell response provides a mechanism of cell kill that is complementary to the ribosomal inactivation caused by the SLTA. Dosing of MT-6402 in the Phase 1 study began in 2H21.


Ribosome inactivation + forced internalization + de-immunization

MT-0169 is a 2nd generation ETB that utilizes a genetically engineered de-immunized Shiga-like toxin A-subunit (SLTA) designed to reduce the potential for innate and adaptive immunogenicity. MT-0169 targets CD38, a poorly internalizing receptor expressed on myeloma cells. MT-0169 directly kills CD38-expressing tumor cells via ribosomal inactivation. Data in non-human primates suggest that MT-0169 can be dosed at higher doses than MT-3724 with a markedly reduced propensity of innate immune response compared with MT-3724. Preclinical data suggest that MT-0169 retains activity in the presence of daratumumab, an approved CD38 antibody. Dosing of MT-0169 in the Phase 1 study initiated in 1Q20.


Ribosome inactivation + forced internalization + de-immunization

MT-8421 is a next-generation ETB that utilizes a genetically engineered de-immunized Shiga-like toxin A-subunit (SLTA) designed to eliminate CTLA-4-expressing Tregs in the tumor microenvironment (“TME”) through a direct cell-kill mechanism independent of the effector cell presence that antibodies rely upon while not effecting Tregs in the periphery, the major mechanism of antibody-mediated autoimmune toxicity.

Manufacturing Capabilities

Manufacturing Capabilities

Molecular Templates has built and operates a multi-product cGMP manufacturing facility in Austin, TX to supply clinical trial materials for internal and partnered ETB programs.



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