Tagworks paper on pretargeting using click chemistry in vivo

In a recent paper in the Journal of Nuclear Medicine, Tagworks, in collaboration with Austrialian biotech company Avipep, describes an alternative radioimmunotherapy strategy based on separate administration of the tumor-homing agent and a fast clearing radioactive probe. This way, the unwanted high renal retention of low-molecular weight radiometal tumor-homing agents can be overcome.

The Tagworks and Avipep researchers show that a pretargeting strategy with a small protein may be an attractive approach in radioimmunotherapy to reduce kidney uptake while maintaining high tumor targeting. An effective tumor-targeting agent, a TAG72 diabody that had a high kidney uptake as a directly radiometal-labeled analog, showed complete retention of its properties upon TCO-modification. Administration of a radiometal-labeled tetrazine in a second step, showed efficient tumor uptake and most importantly low kidney uptake. This pretargeting strategy could be an important alternative platform, superseding the use of peptides and small proteins as metal-chelate conjugates for imaging and therapy.

Read the full paper: doi:10.2967/jnumed.115.159145


NanoNextNL awards two valorization grants to Tagworks

Tagworks Pharmaceuticals has received two valorization grants, €180,000 total, from NanoNextNL, the Dutch research and innovation program on nanotechnology. The grants will be used to take two of the company’s core programs to the next level.

One grant concerns Tagworks’ antibody drug conjugate (ADC) technology and will be applied to further demonstrate the benefits of the use of click chemistry to activate ADCs on the tumor. The other grant will be dedicated to further development of a novel liver-targeted clearing agent. Through a chemical reaction, this agent enables instantaneous clearance of tagged nanomedicine from the blood at any desired time. Such an agent offers promising perspectives for boosting the therapeutic window of ADCs or drug containing liposomes by controlling and minimizing off-target toxicity. Furthermore, when used in combination with directly labelled antibodies in companion diagnostic applications, use of this agent will improve the target/blood ratio and thus enhance image quality.