IDEAYA Biosciences Announces IND Clearance for IDE034, a Potential First-in-Class Bispecific B7H3/PTK7 TOP1 ADC Targeting Multiple Solid Tumor Types

Core Insights - IDEAYA Biosciences has received FDA clearance for an IND application to initiate a Phase 1 clinical trial for IDE034, a bispecific B7H3/PTK7 TOP1 antibody-drug conjugate, expected to start patient enrollment in Q1 2026 [1][2] - The drug targets solid tumors expressing B7H3 and PTK7, with co-expression rates in lung, colorectal, and head and neck cancers reported at approximately 30%, 46%, and 27% respectively [1][5] - IDE034 has shown strong anti-tumor activity in preclinical studies, supporting its advancement into clinical development [3][5] Company Overview - IDEAYA Biosciences focuses on precision medicine in oncology, aiming to develop targeted therapies that are aligned with the genetic drivers of cancer [4] - The company has a robust pipeline of product candidates, particularly in synthetic lethality and antibody-drug conjugates for molecularly defined solid tumor indications [4] Clinical Development Strategy - The company is advancing a differentiated clinical strategy with three potentially first-in-class clinical-stage programs aimed at enhancing the efficacy of TOP1 ADCs through a PARG DDR combination mechanism [2][3] - Preclinical studies suggest that combining IDE034 with IDE161, a PARG inhibitor, may enhance anti-tumor activity in patients with solid tumors co-expressing B7H3 and PTK7 [3][5]