Pharmacodynamic (PD) Biomarkers segmentation by type disaggregates the market into genomic, proteomic, cellular, and imaging readouts. Genomic PD biomarkers quantify target-gene modulation (mRNA, miRNA, epigenetic marks) and account for the largest share because they scale easily in high-throughput qPCR or RNA-seq workflows, enabling early go/no-go decisions. Proteomic readouts, including phospho-protein ELISA and mass-spec assays, directly reflect pathway engagement; although costlier, they dominate immuno-oncology trials where phosphorylation states define mechanism-of-action. Cellular PD biomarkers—flow-cytometry or ELISPOT measurements of cytokine shift, proliferation, or cytotoxicity—offer functional confirmation, justifying premium pricing in cell-therapy programs. Imaging PD biomarkers, such as PET tracers for receptor occupancy, occupy a niche but high-value slice; their capital-intensive nature restricts use to late-phase studies where spatial information is critical. Collectively, these four technical tiers map drug activity to biological context, anchoring market sizing to the modality-specific demand for evidence of pharmacology.