TABLE 1.

Demographics of patients with rhabdomyosarcoma and bone marrow metastasis at diagnosis (N = 27)

	N	Percentage
Gender
Female	14	52
Male	13	48
Age
Age <10 years	6	22
Age ≥10 years	21	78
Subtype
Alveolar	25	93
PAX3-FOXO1 fusion	22
PAX7-FOXO1 fusion	1
Negative for FOXO1 fusion	1
Unknown fusion status	1
Embryonal	2	7
Primary site of disease
Extremity/gluteal	14	52
Trunk/mediastinum/paravertebral	4	15
Abdomen/retroperitoneum	2	7
Genitourinary (vulvar/paratesticular)	2	7
Parameningeal	2	7
Perineal/pelvis	2	7
Prostate	1	4
Metastatic sites
Bone marrow + bone	2	7
Bone marrow + lymph node	2	7
≥3 sites including bone marrow	23	85
Oberlin score
2	2	7
3	11	41
4	14	52

Note: Alveolar fusion status indicates fusion presence in bone marrow and/or tumor at diagnosis. The Oberlin score was a point system with a maximal score of 4.⁶