A review of previous TUR‐BT specimens from the same patient indicated that a previous bladder tumor mainly consisted of a SMARCA4‐deficient undifferentiated tumor component (GATA3 [−], BRG1 [−]) with an adjacent urothelial carcinoma component (GATA3 [+], BRG1 [+]; Figure 3). Here, GATA3 is linked to urothelial carcinoma.