TABLE 1.

Proposed grouping criteria based on tumor factors

Carcinoma type	Sarcoma type	Dominant component	No.	2-Year PFS (%)	5-Year PFS (%)	Proposed categorization
Low-grade	Homologous	Carcinoma	96 (10.8%)	77.0	70.1	Type A
Low-grade	Homologous	Sarcoma	65 (7.3%)	57.4	47.4	Type B
Low-grade	Heterologous	Carcinoma	40 (4.5%)	54.1	54.1
Low-grade	Heterologous	Sarcoma	52 (5.8%)	55.5	48.8
High-grade	Homologous	Carcinoma	255 (28.7%)	59.2	47.5
High-grade	Homologous	Sarcoma	110 (12.4%)	47.5	41.5	Type C
High-grade	Heterologous	Carcinoma	134 (15.1%)	45.5	32.6
High-grade	Heterologous	Sarcoma	137 (15.4%)	48.2	35.3

Risk stratification based on three tumor factors: carcinoma component, sarcoma component, and sarcoma dominance

No. number, PFS progression-free survival