Anal cancer
Introduction
Incidence
Anal cancer is an uncommon malignancy, accounting for only a small percentage (4%) of all cancers of the lower alimentary tract.
Estimated new cases and deaths from anal cancer in the United States in 2005:
- New cases: 3,990.
- Deaths: 620.
Gender
Slightly higher in females than in males, male to female ratio: 1:2. The incidence in men younger than 35 has increased and the sex ratio is reversed in this group.
Age
Anal cancer most commonly develops in patients 50 to 60 years old. The incidence in men younger than 35 has increased and the sex ratio is reversed in this group.
Race and ethnicity
Recently an increase in the incidence of anal cancer in black men in the United States has been noticed.
Geography
Anal cancer more frequently afflicts urban than rural population.
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