Cancer is common, but only 5-10% is hereditary. Your genes are like a blueprint or instruction manual for your body. Some of these genes help protect you from developing cancer.
We all have small differences in our genes, called variants, that make each of us unique. Most of these variants don’t impact our health. Some variants, though, are harmful and can make a gene not work correctly. If a cancer gene has a harmful variant, it cannot protect us from cancer as it should. People with harmful variants have a higher chance to develop cancer.
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