Used in research and development of targeted cancer therapies, particularly in studies involving cell adhesion, tumor metastasis, and signal transduction pathways. This antibody serves as a reference tool to evaluate the binding and functional characteristics of anti-CD9 antibodies in immunoassays and flow cytometry. It supports the development of diagnostic assays and therapeutic candidates by providing a benchmark for specificity and affinity against CD9-expressing cells. Also employed in antibody-drug conjugate (ADC) research to assess target engagement and internalization in hematological and solid tumor models.