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How do doctors use cancer stage to choose treatment?

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Precancerous growth in a human colon — cancer View through an endoscope of a polyp, a benign precancerous growth projecting from the inner lining of the colon.

Doctors use cancer staging as a primary factor in determining the most appropriate approach to treatment. By assessing the size of the primary tumor and the extent to which it has disseminated within the body, staging helps clinicians predict tumor behavior and establish a patient’s prognosis.1

The TNM staging system is commonly used to guide these decisions, where T represents the size of the primary tumor, N indicates the involvement of lymph nodes, and M denotes the presence of distant metastases.1

Based on this information, oncologists determine whether a patient can be cured by local treatment, such as surgery, or if the disease requires a combination of therapies. For instance, if a tumor has spread beyond the primary site, doctors may integrate adjuvant treatments—such as radiation or chemotherapy—alongside surgery to improve survival rates. In cases where a cure is not possible, staging helps doctors identify when to prioritize palliative surgery to manage pain or improve quality of life.2