Cancer is not a disease of only the elderly. Some cancers, however, are more prevalent in old age. What factor may explain one of the relationships between cancer and age?
A) Prolonged exposure to carcinogens
B) Age-related weight differences
C) Increased T-cell activity with age
D) Alterations in BRCA1 and BRCA2 genes
A
Feedback:
Over a lifetime, people are exposed to many carcinogens. Although weight tends to increase during adult years, people who survive into old age tend to be thinner. T-cell activity lessens, not increases, with age. The risk associated with some genes is independent of age.
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