A constituent of the body that never have cancer?
Answers:
Cartilage.
Your height, bulk, breadth, skin colour, shadow and breath. And your body heat. And your body odour.
Oh, and your corneas and your tooth enamel.
Non-cellular tissues (hair, fingernails) won't develop cancer. But any living cell has the potential for mutations which affect normal control of growth.
Hair? And I've never heard of fingernail cancer.
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