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Gastric cancer is
one
of
the most common malignant
tumors,
the
foremost
among tumors
of
digestive
tract.
The
incidence
continues
to
rise recently, and
ranks
third
in all malignant tumors'
Half
of
the death
cases
of
malignant tumors
of
digestive tract
are
gastric cancers.
The
ratio of
the invasion between male and female
'is
2-4:1.
tt
happens
in
any
years
of
age, and
mostly
after middle
age. Owing
to
the high
morbidity
and death rate, especially the five
y-ear
survival
rate
is-less
than
20%
in
mid.-late
stage, realizing
and
managing precancerous variations
in
time can
prevent
gastric
cancer.
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