A woman is surprised to read on the Internet that certain infections can cause cancer and has sought clarification from her family physician during an office visit. How can the physician best respond to the woman's query?
A)
"Though it's not particularly common, it's true that certain bacteria and viruses can lead to cancer."
B)
"Most cancers that cannot be attributed to family history or lifestyle are in fact associated with viruses."
C)
"There are many viruses, but only a very few of them have been shown to cause cancer in humans."
D)
"This is true; for example, HIV has been shown to cause cancer in some patients.
Ans:
C
Feedback:
Four DNA viruses have been implicated in human cancers: the human papillomavirus (HPV), Epstein-Barr virus (EBV), hepatitis B virus (HBV), and human herpesvirus-8 (HHV-8). Bacteria have not been linked with cancer, and viruses do not account for a large proportion of cancer cases. HIV is associated with an increased risk of cancer caused by HHV-8, but HIV itself does not cause cancer.
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