The application axis of personalized medicines in oncology segmentation divides the market into solid tumors and hematological malignancies, with solid tumors commanding ~72 % share in 2023. Solid-tumor molecular diagnostics (EGFR, ALK, ROS1, BRAF, HER2, PD-L1) anchor the revenue base because screening volumes are high and companion diagnostic mandates cover multiple lines of therapy. Within this slice, lung, breast and colorectal cancers are the commercial heavyweights; pharmaceutical sponsors sequence CDx development for these indications first, so label expansions immediately translate into test uptake and downstream therapy sales. Conversely, hematological malignancies (~28 % share) exhibit lower per-test revenue but faster growth; next-generation sequencing panels for acute leukemia and lymphoma are moving from tertiary-center labs to community hospitals, broadening the addressable patient pool and tightening the link between clonal evolution data and targeted or CAR-T interventions.