Which component of the TNM system assesses tumor size?

The component of the TNM system that assesses tumor size is represented by the "T." The "T" component specifically pertains to the size and extent of the primary tumor. This classification provides crucial information regarding how large the tumor is and how far it may have spread into nearby tissues. Understanding tumor size is essential in determining the stage of cancer, guiding treatment decisions, and predicting patient outcomes.

In contrast, the "N" component refers to the presence and extent of regional lymph node involvement, while the "M" component indicates whether metastasis has occurred to distant sites. Since "N" and "M" do not provide information about the dimensions of the primary tumor, they are not relevant to assessing tumor size directly. Thus, the correct association of tumor size with "T" within the TNM staging system is foundational to cancer diagnosis and treatment planning.