The Precision Oncology ecosystem spans three functional layers. Upstream, raw material and component suppliers deliver reagents, antibodies, and sequencing kits that enable molecular profiling. Midstream, technology providers, system integrators, and distributors assemble and commercialize next‑generation sequencing platforms, bioinformatics pipelines, and turnkey diagnostic solutions. Downstream, service providers ensure operational readiness of clinical laboratories, while data and analytics firms curate genomic and outcomes datasets that feed therapeutic decision‑support tools. End users—oncologists, pathologists, and health‑system buyers—consume test results to match patients with targeted therapies. Value is created through the transformation of biological samples into actionable molecular insights and captured via test reimbursements, data licensing, and therapy selection contracts.