What phase of clinical trials focuses on learning how a new treatment compares with standard treatment?

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The main idea is that this phase is designed to directly compare a new therapy with the standard treatment to see which works better and at what safety cost in a larger, more diverse group of patients. Phase III trials are built to provide definitive evidence of benefit–risk by randomizing patients to receive the new treatment or the current standard, often across multiple centers. They focus on clinically meaningful outcomes like overall survival, disease-free survival, response rates, and quality of life, while closely monitoring safety in a sizable population. This level of evidence is what regulators rely on to approve new therapies and guide clinical practice. Earlier stages focus first on safety and dosing (Phase I), then on preliminary efficacy in smaller groups (Phase II), and after approval, long-term safety in the real world (Phase IV).