The application segmentation of the Recombinant Human GM‑CSF for Injection market is driven by four primary therapeutic areas: oncology, bone‑marrow transplantation, infectious diseases, and immunotherapy support. Oncology, the largest segment at approximately 40% of total revenue, utilizes GM‑CSF to mitigate chemotherapy‑induced neutropenia, thereby enabling dose‑intensification and improving patient outcomes. Bone‑marrow transplantation follows with a 30% share, where GM‑CSF accelerates hematopoietic recovery post‑transplant, reducing hospitalization length. Infectious disease applications, representing 20%, focus on enhancing innate immunity in patients with severe infections or sepsis. The emerging niche of immunotherapy support contributes the remaining 10%, leveraging GM‑CSF to augment dendritic cell activation in checkpoint‑inhibitor regimens. This Recombinant Human GM‑CSF for Injection segmentation clarifies how each therapeutic use allocates revenue, informing stakeholders about growth vectors and potential reallocations driven by clinical trial outcomes or guideline revisions.