In contrast, the expression of ALDH1A3 (Figure 8b) or ALDH6A1 (Figure 8c) alone cannot predict survival in soft-tissue sarcoma patients, but the differential expression of these genes might be specific for rhabdomyosarcoma as indicated by PDX expression profiling data (Figure 7) and by a previous study that reported ALDH6A1 to be associated with worse survival in rhabdomyosarcoma patients [31]. This evidence concerns the gene ALDH6A1 and rhabdomyosarcoma.