Table 1.

YY1 scoring as continuous variable

	YY1 - 0	YY1 - 1	YY1 - 2	YY1 - 3	YY1 - 4
Clinical features	4 patients	9 patients	4 patients	9 patients	15 patients
Age	16.3 ± 7.4	30.1 ± 23.9	13.0 ± 2.2	12.3 ± 8.9	19.7 ± 13.4
Gender
Male	25.0	66.7	100.0	66.0	73.3
Chemonecrosis ≥ 90%	50.0	33.3	25.0	33.3	40.0
Metachronous metastasis (%)*	0	12.5	75.0	60.0	88.9
Mortality	25.0	22.2	50.0	66.7	53.3
Mean follow -up	50.3 ± 31.6	39.7 ± 21.0	62.0 ± 37.3	43.6 ± 23.0	48.5 ± 25.6

*Data reported are from the 27 patients free of metastasis at baseline and expressed in percentage