The incidence of rectal cancer among people aged 40 years old and below has been increasing over the past years. This is true for all races and whether one is a man or a woman.
Using time-series data (from 1973 to 2005), taken from the Surveillance Epidemiology and End Results cancer register which covers 7,661 colon and rectal cancer patients age 40 and below, researchers concluded that the rectal cancer rate is increasing among people age 40 and below.
The study, which was published in the journal Cancer, shows that rectal cancer overall rates rose annually by 3.8 percent from 1984 to 2005. In contrast, colon cancer remained basically flat in people age 40 and below during the recent decades.