What does the term "tumor" refer to in cancer treatment?

The term "tumor" specifically refers to a lump of tissue that forms due to the accumulation of abnormal cells. In the context of cancer treatment, identifying and understanding tumors is crucial because they can be either benign or malignant, with malignant tumors being cancerous. This definition emphasizes that tumors arise from cells that grow uncontrollably and can disrupt normal bodily functions, leading to various health issues.

Understanding this definition is essential in oncology, as it informs the diagnosis, treatment planning, and management of cancer patients. For instance, the treatment approaches may differ significantly between malignant tumors, which require aggressive treatments such as chemotherapy, surgery, or radiation, and benign tumors, which might only necessitate monitoring or surgical removal if they cause symptoms.