Which of the following phrases best describes how genes play a role in invasive cancer?

• A. A single gene mutation is always sufficient to result in invasive cancer.
• B. A combination of genetic and environmental variables contributes to the development of invasive cancer.
• C. Gene mutations are only important in the early stages of cancer formation and are unimportant in invasive cancer.
• D. Invasive cancer is caused by mutations in non-coding regions of the genome rather than in coding regions.

Answer: (B)