Regeneron Signs $2.3 Billion Pact with Parabilis for Novel ADC-Like Antibody–Helicon Conjugates

Regeneron has announced a strategic research collaboration with Parabilis Medicines to discover and develop multiple therapeutic candidates based on Parabilis’ Helicon™ peptide platform, with a particular focus on Antibody–Helicon™ Conjugates (AHCs).

The deal includes a $125 million near-term package for Parabilis, comprising a $50 million upfront payment and a $75 million equity investment from Regeneron, with potential total value of up to $2.325 billion including milestones and royalties.

Helicons are stabilized, cell-penetrant alpha-helical peptides designed to engage intracellular protein targets, including flat protein surfaces typically refractory to small molecules, thus enabling targeting of previously undruggable proteins.

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