PGP and lung cancer: Similarly, the initial absorption rate of 10% for G-Rg3s also showed a spike to more than 20% after 50 μM verapamil treatment and close to 30% after 100 μM verapamil treatment, which indicated that treatment with the P-gp inhibitor verapamil augmented the intestinal G-Rg3 absorption in lung cancer model mice.