CD274 and rhabdomyosarcoma: Similarly, in our study, DDR pathway alterations were associated with increased frequency of PD-L1+ IHC overall (+7.3%) and among rhabdomyosarcoma (+39.1%), phyllodes tumor of the breast (+37%), undifferentiated uterine sarcoma (+27.9%), and sarcoma NOS (+9.3%) subtypes (all p < 0.05).