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Genmab and Synaffix Enter into $415m License Agreement for ADC Technology

  • Synaffix to provide access to proprietary antibody-drug conjugate (ADC) technologies
  • Genmab secures rights for conducting research on ADCs against multiple drug targets with options for exclusive worldwide development and commercialization of resulting therapies
  • Synaffix to receive an upfront payment of USD $4.5 million with a total deal value of up to USD $415 million plus tiered single digit royalties on sales of successfully commercialized therapies

COPENHAGEN, Denmark and AMSTERDAM, Netherlands; 4 January, 2022 — Genmab A/S (Nasdaq: GMAB) and Synaffix B.V., announced today that Genmab and Synaffix have signed a license agreement providing Genmab broad access to Synaffix’s ADC technologies. Genmab is granted exclusive research rights to utilize Synaffix ADC technologies for one drug target with the option for the worldwide development and commercialization of the resulting ADCs. Genmab has the option to exercise exclusive research and commercial licenses for additional targets.

For each specific target nominated under the license agreement, Genmab gains exclusive access to Synaffix’s clinical-stage GlycoConnect™ antibody conjugation technology, HydraSpace™ polar spacer technology, as well as select toxSYN™ linker-payloads, each designed to enable ADCs with best-in-class efficacy and tolerability for the development of multiple potential therapies.

Genmab will be responsible for the research, development, manufacturing and commercialization of any resulting ADC therapies. At the same time, Synaffix will support Genmab’s research activities, including manufacturing of components that are specifically related to its proprietary ADC technologies.

“At Genmab, we are committed to bringing differentiated medicines to patients, and we believe collaborations are foundational to accelerate innovation,” said Jan van de Winkel, Ph.D., Chief Executive Officer, Genmab. “We look forward to working with Synaffix toward our shared goal of developing best-in-class or first-in-class antibody therapies and make an impact on the lives of patients.”

“In what represents our fifth out-licensing deal in the last six months, we are thrilled to partner with Genmab, an international biotechnology company,” said Peter van de Sande, Chief Executive Officer of Synaffix. “In deploying our cutting-edge ADC technology platform together with Genmab’s robust antibody development capabilities, Synaffix is privileged to once more play an essential role in strengthening a partner’s pipeline with our innovative ADC technologies thereby aiding the transformation of cancer treatment.”

Financial Terms

Under the terms of the agreement, Synaffix will receive an upfront payment of USD $4.5 million and, on a target-by-target basis, is eligible to receive option-exercise, development-, regulatory- and commercial milestone payments. The total potential deal value is USD $415 million plus tiered, mid-single digit royalties on commercial sales.

About Genmab

Genmab is an international biotechnology company with a core purpose to improve the lives of people with cancer. For more than 20 years, Genmab’s vision to transform cancer treatment has driven its passionate, innovative and collaborative teams to invent next-generation antibody technology platforms and leverage translational research and data sciences, fueling multiple differentiated cancer treatments that make an impact on people’s lives. To develop and deliver novel therapies to patients, Genmab has formed 20+ strategic partnerships with biotechnology and pharmaceutical companies. Genmab’s proprietary pipeline includes bispecific T-cell engagers, next-generation immune checkpoint modulators, effector function enhanced antibodies and antibody-drug conjugates.

Genmab is headquartered in Copenhagen, Denmark with locations in Utrecht, the Netherlands, Princeton, New Jersey, U.S. and Tokyo, Japan. For more information, please visit and follow us on

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Protein Conjugates

Bring your own and/or choose from the following categories. 


Just like our ADC technology, we can easily attach peptide and protein-based payloads to your antibody.


Early preclinical data available on request.

Bring Your Own

scFv / Fab

Immune Cell Recruiters


T cell recruitment

NK cell recruitment

IL-15 Receptor Fusion

NK cell recruitment

HydraSpace™ Polar Spacer

Forming an integral part of every toxSYN™ linker-payload, HydraSpace™ bears a negative charge at physiological pH and improves:

  1. Therapeutic efficacy
  2. Tolerability
  3. PK
  4. Manufacturability
Key publication about HydraSpace

GlycoConnect™ design easily matches payload potency with the most appropriate drug-antibody ratio (DAR).

Key publications about GlycoConnect™

toxSYN™ Linker-Payloads

Choose from the following linker-payloads, attach to your antibody under a technology evaluation and go straight into ADC product development following positive POC.
Mode-of-Action Payload
(Active Catabolite)
1. SYNtecan E™*Topoisomerase 1 inhibitor Camptothecin-based
2. SYNeamicin D™*DNA
damaging agent
3. SYNeamicin G™*
4. SYN-PNU™*Nemorubicin-based
5. SYNstatin E™Microtubule
6. SYNstatin F™
7. SYNtansine™ Maytansine-based

* Patent protection filed by Synaffix, beyond the claims of GlycoConnect™ and HydraSpace™

** N-6-aminohexanoyl-maytansine (Ahx-maytansine)