Parameters:
(1) mitotic count in 10 high-power (40x objective) fields
(2) specific type of tumor
A tumor was classified as high grade if one or more of the following was present:
(1) mitotic count was >= 10 mitotic figures in 10 high-power fields
(2) pleomorphic liposarcoma
(3) round cell liposarcoma
(4) mesenchymal chondrosarcoma
(5) extraskeletal osteosarcoma
(6) alveolar soft part sarcoma
A tumor was classified as low grade if:
(1) mitotic count < 10 mitotic figures in 10 high-power fields
(2) well-differentiated fibrosarcoma
(3) infantile fibrosarcoma (with age <= 4 years)
Both tumors show a rapid decline in event-free suvival over the first 2 years then stabilize. At 5 years the event-free survival was 63% for low-grade and 13% for high-grade tumors respectively.
