CLDN6 and granular cell tumor: Female CLDN6− NOY-1 as well as non-cancerous control cells did not respond to CLDN6-ADC treatment (Fig. 1D), while MMAE alone expectedly reduced cell viability in GCT cells at low concentrations (LD50 72 h 0.19 - 10.7 nM) (Additional file 1: Fig. S1B).