Inatherys SAS recently presented preclinical data for INA-03, an anti-transferrin receptor (TfR1/CD71) antibody-drug conjugate (ADC), being developed for the treatment of triple-negative breast cancer (TNBC). INA-03 was constructed by conjugating an antimitotic payload (MMAE) to a humanized IgG4 anti-human CD71 antibody using a novel valine-citrulline linker.