With no explanation, label each line with "other-disease", "O", "other-medical", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Chemotherapy
(
drug
treatment
for
cancer
)
may
be
used
before
surgery
,
after
surgery
,
or
instead
of
surgery
for
those
cases
in
which
surgery
is
considered
unsuitable
.
Chemotherapy:other-medical
(:O
drug:O
treatment:O
for:O
cancer:other-disease
):O
may:O
be:O
used:O
before:O
surgery:O
,:O
after:O
surgery:O
,:O
or:O
instead:O
of:O
surgery:O
for:O
those:O
cases:O
in:O
which:O
surgery:O
is:O
considered:O
unsuitable:O
.:O