BCL2 and neoplasm: Upon exposure to high concentrations of intracellular glutathione, the released drug and gene inhibited tumor growth by inducing tumor cell apoptosis through the antitumor activity of 10‐hydroxycamptothecin and silencing of the Bcl‐2 proto‐oncogene.[124] Gene therapy delivered by redox‐responsive nanocarriers is often used for treating other diseases.