931 / 1708
G1
G2
G3
JBJS 1998
Grade Percentage
Necrosis
Histologic Appearance
I
0-49
Little or no necrosis
II
50-89
Areas of acellular tumor osteoid
and/or fibrotic material
attribuitable to the effect of
chemotherapy, with other areas
of viable tumor
III
90-99
Predominant areas of acellular
tumor osteoid and/or fibrotic
material attribuitable to the
effect of chemotherapy, with
only scattered foci of viable
tumor cells
IV
100
No pathologic evidence of viable
tumor within the specimen
I
II
III
IV