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(2) Mortality is about evenly distributed between the two
sexes at all ages, making allowance for the preponderance o
females in the general population.
(3) The two main groups of organs attacked in both sexes are
the alimentary system and the reproductive system. In male*
80.8% of the total deaths fall within these groups and in females
89.3%. In both sexes Cancer of the digestive system is the commonest
situation, amounting to 75.1% in males and 52.5% in
females. Cancer of the reproductive system caused 36.8% of the
total deaths in females. Cancer of the larynx, tongue and mouth
is much commoner in males than females, 16 deaths occurring in
males as compared with 2 in females. The organs most often
attacked in descending order of incidence are, in males—tlie
Stomach (22.0%), Rectum (14.8%), Bowels (12.7%), Tongue and
Mouth (8.5%), and Oesophagus (6.4%); in females—the Breasl
(21.7%), Bowels (17.7%), Stomach (17.1%), and Uterus (9.6%),
This is slightly different from the incidence in 1929.
The main incidence of Cancer is, in both sexes, on two
groups of organs, both having a common characteristic, namely,
periods of active cell degeneration and regeneration.