To this end, we examined the effect of branebrutinib on the drug transport function of P-gp by performing a short-term fluorescent drug efflux assay in NCI-ADR-RES (Figure 2A) and KB-V-1 (Figure 2B) cancer cells, as well as in MDR9-HEK293 (Figure 2C) cells. This evidence concerns the gene PGP and cancer.