PGP and cancer: Our previous studies showed that zhankuic acid A, B, and C, major triterpenoids in Taiwanofungus camphoratus, have collateral sensitivity effects on the MDR cancer cell line (KBvin) and P-gp inhibitory effects on the P-gp over-expressed cell line (ABCB1/Flp-InTM-293) [27,28,29].