The Ensartinib segmentation by application distinguishes three clinically relevant use‑cases: first‑line treatment, second‑line treatment, and maintenance therapy. First‑line treatment captures patients newly diagnosed with ALK‑positive non‑small cell lung cancer (NSCLC) and accounts for the largest share of revenue because pricing is set at the premium tier and the patient pool is broad. Second‑line treatment targets individuals whose disease has progressed after initial therapy, contributing a substantial portion of the market due to higher dosing intensity and the frequent need for combination regimens. Maintenance therapy comprises patients who have achieved disease control and remain on long‑term, lower‑dose administration; although its unit price is lower, the extended treatment duration generates a steady, cumulative revenue stream. Collectively, these application segments define the overall market size, with first‑line driving growth, second‑line sustaining depth, and maintenance providing a stabilizing baseline.