What do population-based cancer registries primarily focus on?

• A. All cancers, including benign.
• B. Only pediatric cancers.
• C. Malignant cancers.
• D. Only brain tumors.

Answer: (C)

The main idea is that population-based cancer registries exist to monitor the burden of cancer in a defined population by collecting data on malignant tumors. Malignant cancers are the focus because they have invasive potential, are life-threatening, and are the cancers that public health surveillance is designed to track for incidence, survival, and trends. Benign tumors aren’t consistently reportable and don’t have the same public health significance, so they aren’t the primary data collected. These registries typically cover all ages and cancer sites, not just pediatric cases or a single location like the brain, though some sites may also track in situ cases for certain analyses.