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The type of tumor characterized by a likelihood to spread is a malignant tumor. Malignant tumors are cancerous and have the ability to invade surrounding tissues and metastasize, which means they can spread to other parts of the body through the bloodstream or lymphatic system. This ability to invade and spread is what distinguishes malignant tumors from benign tumors, which do not spread and are typically considered less dangerous.

The term "metastatic" specifically refers to cancer that has spread from its original site to other areas of the body, which is a characteristic of malignant tumors. However, the term "malignant" encompasses all tumors that exhibit this aggressive behavior, making it the more appropriate choice in the context of this question. Additionally, "cellular" does not specifically describe a type of tumor in relation to its potential to spread.