2.1. Patients
For the purpose of this analysis eligible patients were those with:
a. Alveolar rhabdomyosarcoma confirmed by histology and
b. Regional nodal involvement defined by clinical orradiological or pathologic criteria, without distant metastases, and
c. Enrolled in protocol EpSSG RMS2005, between November 1, 2005 and December 31, 2016 or
d. Enrolled in protocol COG ARST0531, between December 1, 2006 and December 31, 2012.
Date of data cutoff for the analysis were: Dec 31, 2019 for RMS2005 and Dec 31, 2018 for ARST0531.