<s>
PET	B-Algorithm
response	I-Algorithm
criteria	I-Algorithm
in	I-Algorithm
solid	I-Algorithm
tumors	I-Algorithm
(	O
PERCIST	B-Algorithm
)	O
is	O
a	O
set	O
of	O
rules	O
that	O
define	O
when	O
tumors	O
in	O
cancer	O
patients	O
improve	O
(	O
"	O
respond	O
"	O
)	O
,	O
stay	O
the	O
same	O
(	O
"	O
stabilize	O
"	O
)	O
,	O
or	O
worsen	O
(	O
"	O
progress	O
"	O
)	O
during	O
treatment	O
,	O
using	O
positron	B-Application
emission	I-Application
tomography	I-Application
(	O
PET	O
)	O
.	O
</s>
