Which factor most strongly influences prognosis in adolescent cancer?

• A. Age at diagnosis.
• B. Size of primary tumor.
• C. Degree of metastasis.
• D. Response to therapy.

Answer: (C)

Prognosis is driven most strongly by how far the cancer has spread at diagnosis. When a tumor is confined to its original location, treatment can often eradicate it, and the chance of cure is higher. Once cancer has disseminated to distant sites, the disease becomes systemic, the tumor burden is greater, and treatment outcomes are generally worse. This pattern holds across many adolescent cancers, making the extent of metastasis the strongest predictor of survival.

Other factors like the size of the primary tumor, the patient’s age, or how well the cancer responds to therapy influence prognosis as well, but they don’t predict outcomes as consistently as whether the disease has spread. For example, even a large localized tumor can have a better prognosis than a small tumor that has already metastasized, and a great initial response to therapy improves outlook, but metastasis status at diagnosis remains the most powerful determinant of overall prognosis.