Final answer:
Tumor cell differentiation can help establish the aggressiveness of a tumor. Invasive carcinoma is considered a defining property of aggressive tumors, while pre-malignant tumors have the potential to become invasive. Biological changes, such as changes in cell size and tissue organization, can also indicate tumor aggressiveness.
Step-by-step explanation:
Tumor cell differentiation refers to the process by which tumor cells acquire distinct characteristics and functions as they develop into different types of cells. In the case of cancer, tumor cell differentiation can be used to establish the aggressiveness of a tumor.
Invasive carcinoma, which is cancer that invades surrounding tissues, is considered the defining property of aggressive tumors. On the other hand, pre-malignant tumors are neoplasms that have the potential to become invasive if left untreated.
Biological changes, such as changes in cell size, nucleus size, and tissue organization, can also indicate the aggressiveness of a tumor. For example, the high degree of organization among different types of cells in healthy tissue contrasts with the breakdown of organization seen in cancerous tissue.