Table 1.

Details of patients’ disease, management, and outcome

Patient	Age (years)	Arising from	Muscles	SIJ	Approach	Margins	Local recurrence	Metastases	Dedifferentiation	Patient survival
1	74	Coccyx	GM	N	Posterior	Marginal	Yes 25 months	Ribs	N	Alive at 10 years
2	72	S4	GM	N	Posterior	Marginal	Yes 31 months	Cervical spine	N	Died at 3 years
3	64	S3	GM + P	Y	Combined	Wide	Yes 2 months	Pulmonary	Y	Died at 6 months
4	78	S3	P	Y	Posterior	Wide	Yes 84 months	N	N	Alive at 7.5 years
5	64	Coccyx	P	N	Posterior	Wide	N	N	N	Alive at 7.2 years
6	71	S2	GM + P	Y	Posterior (patient refused combined)	Intralesional	Yes 25 months	Ribs	N	Died at 5.4 years
7	61	S3	N	Y	Posterior	Marginal	N	N	N	Alive at 6.8 years
8	66	Coccyx	N	N	Posterior	Marginal	N	Ribs	Y	Alive at 6 years
9	54	S2	P	Y	Combined	Marginal	Yes 45 months	Liver	N	Died at 4.2 years
10	57	S2	P	Y	Combined	Wide	Yes 4 months	Pulmonary	Y	Died at 9 months
11	73	S2	GM + P	Y	Combined	Wide	Yes 72 months	N	N	Alive at 5.4 years
12	67	S4	GM	Y	Combined	Marginal	Yes 6 months	Ribs/Pulmonary	N	Died at 2 years
13	70	S3	GM + P	Y	Combined	Wide	Yes 23 months	N	N	Alive at 3.5 years
14	63	S4	N	N	Posterior	Wide	N	N	N	Alive at 3.4 years
15	73	S2	GM + P	Y	Combined	Marginal	Yes 13 months	Spine/Pulmonary	N	Died at 4.2 years
16	64	S3	GM + P	N	Combined	Wide	N	N	N	Alive at 3.2 years
17	70	S4	GM + P	N	Posterior	Wide	Yes 18 months	N	N	Alive at 3.1 years
18	31	Coccyx	N	N	Posterior	Wide	N	N	N	Alive at 3 years

Y = yes; N = no; GM = gluteus maximus; P = piriformis.