Drawing lessons from the clinical development of antibody-drug conjugates.

The antibody-drug conjugate (ADC) field has seen a remarkable expansion in the number of entrants in clinical studies. Many of these agents employ newer conjugation technologies that have been developed over the last decade that confer various attributes to the ADCs prepared with them, including stability, potency, and homogeneity. In many cases, these new ADCs appear demonstrably superior to earlier technologies in preclinical models of activity and toxicology, but the degree to which these improvements will translate to the clinic is only starting to be seen. Many of these technologies are now competing head-to-head by targeting the same antigen in similar patient populations, allowing for a direct comparison of their clinical performance properties. As lessons from these experiences feed back into discovery research, future iterations of ADC design may be expected to bring improved therapeutics into the clinic.