Table 1 Clinicopathologic characteristics of cohort.

Case	Age/sex	Site	Morphology	CD34	Desmin	Target RNA sequencing (Archer)	FISH	Follow-up (months)
1	4/F	Hip	Maturing	P	N	No fusion identified	NP	AWOD; 78
2	4/M	Neck	Maturing	P	Fo	CHCHD7-PLAG1	NP	NA
3	4/M	Leg	Maturing	P	Fo	CHCHD7-PLAG1	NP	AWOD; 28
4	6/M	Calf	Maturing	P	P	CHCHD7-PLAG1	NP	AWOD; 2
5	6/M	Arm	Maturing	P	N	HNRNPC-PLAG1^a, CHCHD7-PLAG1	NP	AWOD; 25
6	6/F	Leg	Maturing	P	N	CHCHD7-PLAG1	NP	AWOD; 1
7	10/F	Neck	Maturing	P	P	COL3A1-PLAG1^a, CHCHD7-PLAG1	NP	AWOD; 1
8	11/F	Pretibial	Maturing	P	N	No fusion identified	NP	NA
9	18/M	Palm	Maturing	P	N	No fusion identified	NP	AWOD; 107
10	19/M	Back	Maturing	P	N	No fusion identified	NP	NA
11	29/M	Neck	Maturing	P	N	No fusion identified	NP	NA
12	31/M	Palm	Maturing	NP	NP	No fusion identified	NP	AWOD; 54
13	31/M	Thigh	Maturing	P	P	No fusion identified^b	N	NA
14	44/F	Thigh	Maturing	P	P	SRSF3-PLAG1	NP	AWOD; 1
15	4/F	Neck	Fibroblastic	P	Fo	PCMTD1-PLAG1	NP	AWOD; 17
16	7/M	Back	Fibroblastic	P	Fo	YWHAZ-PLAG1	NP	NA
17	10/M	Back	Fibroblastic	P	P	CTDSP2-PLAG1	N	NA
18	10/F	Arm	Fibroblastic	P	P	PPP2R2A-PLAG1^b	N	AWOD; 5
19	16/M	Hand	Fibroblastic	P	P	No fusion identified^{b, c}	P	NA
20	7/M	Ankle	Conventional	P	N	No fusion identified	NP	AWOD; 29
21	13/M	Arm	Conventional	P	Fo	CHCHD7-PLAG1^b	N	NA
22	41/F	Foot	Conventional	P	N	No fusion identified	NP	NA

F female, M male, FISH fluorescence in situ hybridization, NP not performed, Fo focal, AWOD alive without disease, NA not available.
^aDominant fusion.
^bWhole Transcriptome Sequencing (RNA-seq) also performed.
^cThe sample for RNA-seq has a low tumor content which may impact on the test sensitivity.

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