Suzanne developed lung cancer when she was sixty five. Some of her family members have had lung cancer. In addition, Suzanne was exposed to years of air pollution. Doctors believe that both of these factors contributed to her cancer. Which statement best explains why this scenario represents a multifactorial disease?

A multifactorial disease results from the combined effects of more than one contributing factor. Suzanne had a family history of lung cancer and years of exposure to air pollution, and doctors believe both contributed to her cancer. Therefore, “More than one factor caused the cancer” best explains why it is multifactorial.

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