Which cancer staging system is the most widely used?

The most widely used cancer staging system is the TNM system. This system is recognized for its versatility and comprehensive approach to cancer staging. It categorizes cancer based on three key components: the size and extent of the primary tumor (T), the presence and extent of regional lymph node involvement (N), and the presence of distant metastasis (M).

The TNM system provides a standardized way to describe the severity and spread of cancer, which is critical for determining the prognosis, crafting treatment plans, and facilitating communication among healthcare professionals. Its adoption across various types of cancers around the world contributes to its status as the preferred staging system in oncology.

While other systems like AJCC and FIGO are important as well—AJCC incorporates the TNM classification for a more comprehensive staging framework, and FIGO is specifically tailored for gynecological cancers—the broad applicability and established international use of the TNM system make it the most widely utilized in oncology practice.