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Cancer is
one
of
the
serious
diseases
endangering human health
and life. However,
cancer
patients are only a
small
portion of
the
whole
population.
The
pathogenesis
of
cancer
is of
multiple
factors.
The
course
of
carcinogenesis
is
long
and
reversible, and
consists
of
three
stages
i.e. the initiation
stage,
promotion
stage
and
progression stage.
The
course
may be from
several years to
several
decades.
A number
of factors, inside or outside
the
human
body,
may
inhibit
cancer development at any
stage.
A
normal
cell
which
can
not
smoothly pass through
these three stages
is not
a
real cancer
cell.
Cells
undergoing the process
of
carcinogenesis
are
called mutated
cells
and always exist in
the
human body. How-
ever, it does
not
tally
with
the
actual situation, if
we
misunderstand
that
every body
has cancer cells.
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