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Generally, cancer
could be
divided
into
micro-cancer
and
clinical
apryrent
cancer,
the
former
can
not
be
detected
by
X-ray
exa
mi
nati
on
or
e
ndoscopi
ca
I
i
ns
pe
cti
on.
Trrw
major
factors
are
involved
in
the
pathogenesis
of
cancer
forrnation,
i.e.
the cancer promoting factors and cancer
enhancing
factors.
Chemical
carcinogenic
substdnces
are
cancer pronpting
factors. Mental
sfrest
snnking and
some therapeutic
drugs
are
cancer
enhancing
factors.
The
interaction
of cancer pronoting
and
enhancing
factors
can
cause cancer
forrnation,
especially
in
the
immune
compromized
hosi- Even
after
onset
of
micro-cancer,
it
can
not
be
developed
into
clinical
apryrent
cancer
without the
help by
a
series
of
enhancing
factors.
So
u,e
know
that
the
formation and
development
of clinical
cancer
is
nof very
easy
and
it
will
not
be
occured in
every
person.
Nter
the
first cancer cell clone is formed
in
the
human body,
it will
be
taken
20
to
30 years
to
develop into clinical cancer. During
this
priod,
if
the
host
is in a
healthy
condition,
the
cancer
cells could
be
eliminated
by
body
immune system.
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22
