“All cancers are genetic,” the genetic oncologist might say. If asked to elaborate, they might explain that “all cancers begin when one or more genes in a cell are mutated (changed), creating an abnormal protein or no protein at all” (cancer net). If asked what that means for relatives, they would note that “only about 5% to 10% of all cancers result directly from gene defects… inherited from a parent” (American Cancer Society).
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Whys To Look For Genes: Pros and Complications 